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Stainless Steel Flanges

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Descriptions

Navkar Metal Syndicate manufactures and supplies a complete range of Stainless Steel Flanges engineered for leak-tight, high-integrity piping connections across process, marine, power, and infrastructure applications. Built to ASME/ANSI, EN, DIN, ISO and project specifications, our flanges deliver consistent dimensions, sealing performance, corrosion resistance, and weldability for long service life and low maintenance.

Product Scope

  • Types: Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), Lap Joint (LJ), Long Weld Neck (LWN), Orifice, Spectacle Blind / Spacer & Spade, Reducing & Expander, Plate Flanges.
  • Facing: RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint), Male-Female (M/F), Tongue-Groove (T/G), Large/Small RF as per class and NPS.
  • Pressure Classes: ASME Class 150, 300, 400, 600, 900, 1500, 2500; EN/DIN PN6–PN400.
  • Sizes (NPS / DN): 1/2″ to 48″ (DN15–DN1200), with larger diameters on request.
  • Thickness/Series: As per B16.5/B16.47 Series A/B, MSS-SP-44, and customer data sheets.
  • End Connections: Butt-weld, socket-weld, threaded (NPT/BSPP/BSPT), stub-end + lap joint.

Materials & Grades

We stock and produce SS flanges across a wide grade portfolio to match media, temperature, and corrosion demands:

  • Austenitic: 304/304L/304H, 316/316L/316H/316Ti, 321/321H, 347/347H, 309/309S, 310/310S, 317/317L, 305, 308, 301/302, 201/202, J4, J7.
  • Ferritic: 409L, 430/430Ti, 439, 441, 444.
  • Martensitic: 410/410S, 420, 429.
  • Duplex: S31803 / 2205; (Super Duplex & special alloys on request).

Material test certificates (EN 10204 3.1 / 3.2) include chemical, mechanical, hardness and (when specified) PMI, IGC, impact results.

Dimensions & Standards

  • ASME/ANSI: B16.5 (NPS 1/2″–24″), B16.47 Series A/B (NPS 26″–60″), MSS-SP-44, API 605 (legacy), MSS-SP-6 (finishes), MSS-SP-25 (marking).
  • EN/DIN/ISO: EN 1092-1 (PN), DIN 2631–2638, ISO 7005.
  • Raw Material Specs (typical): ASTM A182/A182M (F304/L, F316/L, etc.), ASTM A240 (plates for plate flanges), ASTM A484 (general requirements).

Engineering Advantages

  • Sealing Reliability: Controlled facing finish (e.g., 125–250 AARH for RF) for gasket compatibility (spiral wound, RTJ rings, sheet gaskets).
  • Corrosion Resistance: Correct grade selection for chloride service, sour service, high temperature, or cyclic loading.
  • Structural Integrity: Forged & normalized or solution-annealed stock; precise bores, hubs, and bolt circles to class rating.
  • Weldability & Fit-Up: Tight tolerances on bevels, land, and ID to match pipe schedule and reduce site re-work.

Quality Assurance & Inspection

  • Document Set: MTC 3.1/3.2, heat traceability, dimensional reports, coating/packing list.
  • NDE (on request): PMI, UT/RT for forgings, DP/MP for sealing faces, ferrite checks for austenitic/duplex.
  • Compliance: Marking as per MSS-SP-25; heat numbers hard-stamped; gasket face protected with covers.
  • Packing: Export-grade, VCI wrap, fumigated pallets/crates; barcoding for project traceability.

Typical Availability Map

Type NPS / DN Class / PN Facing Notes
Weld Neck (WN) 1/2″–48″ (DN15–DN1200) 150–2500 / PN6–PN400 RF, RTJ For high pressure/temperature; full penetration welds.
Slip-On (SO) 1/2″–48″ (DN15–DN1200) 150–600 / PN6–PN100 RF, FF Cost-effective; fillet-weld both sides.
Blind (BL) 1/2″–60″ (DN15–DN1500) 150–2500 / PN6–PN400 RF, RTJ, FF Leak-tight line isolation and hydrotest blanks.
Socket Weld (SW) 1/2″–3″ (DN15–DN80) 150–900 / PN16–PN160 RF Small-bore, high-integrity joints.
Threaded (TH) 1/2″–4″ (DN15–DN100) 150–600 / PN16–PN64 FF/RF NPT/BSP threads; no welds required.
Lap Joint (LJ) 1/2″–24″ (DN15–DN600) 150–600 / PN16–PN64 FF With stub ends for frequent disassembly.
Orifice / RTJ 1″–24″ (DN25–DN600) 300–600 / PN40–PN100 RTJ/RF Flow measurement, tapping holes per spec.

How to Specify / Order

  1. Type & Facing: e.g., WN RF / BL RTJ.
  2. NPS/DN & Rating: e.g., 8″ Class 600 (DN200 PN100).
  3. Material Grade: e.g., ASTM A182 F316L / S31803.
  4. Bore & Schedule Match: STD/40/80, or exact ID for pipe spec.
  5. Testing/Docs: PMI, NDE, 3.1/3.2, additional project requirements.
  6. Quantity & Delivery: Split lots, phased delivery, export packing.

Need a quick quotation or technical guidance? Share your line list / MTO and we’ll map flanges, gaskets, and fasteners to your service conditions.

Chemical Composition

Stainless Steel Flanges manufactured by Navkar Metal Syndicate—including Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), Lap Joint (LJ), and Orifice / RTJ types—are produced in a wide range of grades, each designed for specific corrosion resistance and mechanical properties. Below are the nominal chemical compositions (in weight %) for commonly supplied stainless steel grades.

Grade C (max) Mn (max) Si (max) P (max) S (max) Cr (%) Ni (%) Mo (%) N (%) Remarks / Type
J70.108.51.00.0450.03016.0–18.01.0–2.0——Low Ni, Cu-bearing austenitic – cost-efficient
J40.088.0–10.01.00.0450.03016.0–18.01.0–1.5——Low Ni austenitic; moderate corrosion resistance
2010.155.5–7.51.00.060.0316.0–18.03.5–5.5——Ni-saving austenitic (Cr–Mn–Ni)
2020.157.5–10.01.00.060.0317.0–19.04.0–6.0——Higher Mn–Ni variant of 201
301 / 3020.152.01.00.0450.03017.0–19.06.0–8.0——High strength work-hardening austenitic
304 / 304L / 304H0.07 / 0.03 / 0.102.01.00.0450.03018.0–20.08.0–10.5——General-purpose austenitic stainless steel
3050.122.01.00.0450.03017.0–19.010.5–13.0——High Ni, excellent cold formability
3080.082.01.00.0450.03019.0–21.010.0–12.0——Welding filler composition grade
309 / 309S0.20 / 0.082.01.00.0450.03022.0–24.012.0–15.0——High-temperature oxidation-resistant
310 / 310S0.25 / 0.082.01.50.0450.03024.0–26.019.0–22.0——High-temperature service, oxidation-resistant
316 / 316L / 316H / 316Ti0.08 / 0.03 / 0.102.01.00.0450.03016.0–18.010.0–14.02.00–3.00—Mo-bearing austenitic – superior corrosion resistance
317 / 317L0.08 / 0.032.01.00.0450.03018.0–20.011.0–15.03.00–4.00—High Mo variant for chemical & marine service
321 / 321H0.08 / 0.102.01.00.0450.03017.0–19.09.0–12.0—Ti: 5×C–0.70Ti-stabilized, resistant to intergranular corrosion
347 / 347H0.08 / 0.102.01.00.0450.03017.0–19.09.0–13.0—Nb + Ta: 10×CNb-stabilized high-temp austenitic
409L0.031.01.00.0400.01510.5–11.70.5——Low C ferritic; automotive exhaust & ducting
410 / 410S0.15 / 0.081.01.00.0400.03011.5–13.50.75——Martensitic – heat-treatable, moderate corrosion
4200.15–0.401.01.00.0400.03012.0–14.0———High hardness & wear resistance
4290.121.01.00.0400.03014.0–16.0———Ferritic; improved scaling resistance
430 / 430Ti / 439 / 441 / 4440.12 / 0.08 / 0.03 / 0.03 / 0.0251.01.00.0400.03016.0–18.0—— / 1.0–2.0 (444)Ti, Nb stabilizedFerritic family; decorative, automotive, heat exchanger
S31803 (Duplex 2205)0.032.01.00.0300.02021.0–23.04.5–6.52.5–3.50.08–0.20Duplex structure – high strength & chloride resistance

Note: The above compositions are indicative per ASTM/EN/JIS standards and may vary within specified tolerances. All flanges are manufactured in compliance with ASTM A182 / A240 / A403 (as applicable) and supplied with EN 10204 3.1 / 3.2 certification.

Mechanical, Physical & Fabrication Properties

Mechanical, Physical & Fabrication Properties — Stainless Steel Flanges

Applicable to Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), Lap Joint (LJ), Orifice / RTJ flanges supplied by Navkar Metal Syndicate. Values are typical for mill/forged product in solution-annealed condition unless noted; actual results depend on size, forging reduction, heat treatment, and test direction. Use for selection/quotation; specify required grade/temper on POs.

A. Mechanical & Physical Properties (by Stainless Family)

Family / Covered Grades Typical Tensile Strength
(Rm, MPa)		 Typical Yield Strength
(Rp0.2, MPa)		 Elongation
(A5, %)		 Hardness
(HBW / HRB)		 Density
(g/cm³)		 Modulus E
(GPa)		 Thermal Conductivity
(W/m·K @ 20°C)		 CTE 20–100°C
(µm/m·°C)		 Magnetic Response Max Service Temp (oxidizing, dry)*
Austenitic (Cr-Ni / Cr-Mn-Ni)
J7, J4, 201, 202, 301, 302, 304, 304L/H, 305, 308, 309/309S, 310/310S, 316/316L/H/Ti, 317/317L, 321/321H, 347/347H 		520–700 (higher for 301 work-hardened) 200–320 (alloys like 301 can be higher cold-worked) 35–60 150–215 HBW
≈ 70–95 HRB		 7.90–8.03 193–200 14–21 (≈ 304: 16; 316: 16; 310: 14) 16–18 (≈ 304: 17.2; 316: 16.5) Non-magnetic in annealed state; may become slightly magnetic after cold work 304/316: ~870°C; 309: ~1000–1050°C; 310: ~1100°C
L/H/Ti/Nb grades chosen per sensitization/creep requirements
Ferritic (Cr)
409L, 429, 430, 430Ti, 439, 441, 444 		430–520 240–310 18–30 150–200 HBW 7.70–7.75 200 23–27 (higher than austenitic) 10–12 (lower expansion than austenitic) Magnetic ~750–900°C (grade-dependent; 444 best for chlorides)
Martensitic (Cr, hardenable)
410, 420 (410S is ferritic, see ferritic row) 		650–980 (condition-dependent) 350–750 12–20 200–320 HBW 7.70–7.75 200 20–25 10–11 Magnetic ~600–700°C (tempering limits apply)
Duplex (Cr-Ni-Mo-N)
S31803 / 2205 		620–800 450–550 25–30 ≈ 250 HBW 7.80 200 ~19 13 Magnetic (ferrite+austenite) ~315–330°C (to avoid embrittlement at higher exposures)

*Indicative continuous service temperatures; real limits depend on load, environment (sulphidizing/ carburizing), and time at temperature.

B. Fabrication Properties Matrix (Grade Clusters)

Grade / Cluster Forgeability / Forming Weldability (WN/SO/BL/SW/TH/LJ/RTJ) Heat Treatment Note Machinability Typical Service Strength Advantage Chloride / Seawater Advice
J7, J4, 201, 202 (Cr-Mn-Ni austenitic) Excellent cold form; hot forge 950–1150°C Good; use low-C fillers (e.g., 308L/309L as suited); control distortion Solution anneal 1010–1090°C + water quench for corrosion performance Fair; work-hardens — Use caution in high-chloride; prefer 316/2205 for splash/crevice
301/302/304/304L/304H/305/308 Excellent; 304H for high-temp strength Excellent; 304L minimizes sensitization 304H has higher C for creep; L-grades avoid carbide precipitation Fair — General marine OK (atmospheric); not for stagnant chlorides
309/309S, 310/310S (heat-resisting) Good; avoid prolonged 650–900°C exposure for S grades Good; use matching 309/310 fillers High Cr-Ni for oxidation; S-grades are low C Fair High temp oxidation resistance Still susceptible to chloride SCC; not seawater-duty materials
316/316L/316H/316Ti, 317/317L (Mo-bearing) Very good Excellent; fillers 316L/317L 316Ti stabilized for HAZ; 316H for creep Fair Better pitting/crevice resistance than 304 Preferred in chloride splash/chemical plants; still watch crevices
321/321H (Ti-stabilized) Very good Excellent; use 347/321 fillers per code Stabilized vs sensitization; 321H for high temp Fair High temp stabilization advantage Use 316/duplex for high chlorides
347/347H (Nb-stabilized) Very good Excellent; 347 fillers Nb stabilizes against carbide precipitation Fair High temp stabilization advantage As above
Ferritic 409L, 429, 430, 430Ti, 439, 441, 444 Good; avoid severe deep draw on some grades Good to very good; Ti/Nb-stabilized grades weld best No hardening by heat treat; anneal 760–900°C if needed Good Lower thermal expansion; better thermal fatigue than 3xx 444 (Mo-bearing) best of group in chlorides
Martensitic 410, 420 Forgeable; preheat and PWHT often required Fair; control hydrogen, preheat 150–300°C; PWHT to temper Harden/temper cycles to achieve strength/hardness Good High strength/hardness potential Not recommended for aggressive chlorides
Duplex S31803 (2205) Good; forming radii larger than 304 Very good; use ER2209 fillers; control heat input (interpass <150°C) Solution anneal ~1040–1100°C + water quench to restore phase balance Fair–Good High yield (≈2× 304/316) Excellent pitting/crevice resistance vs 304/316; great for seawater splash

C. Grade Selection Notes for Flange Types

  • WN (Weld Neck): choose 316/316L or 2205 for chloride service; 321/347/310 for hot-end duty.
  • SO / LJ / TH / SW: use L-grades (304L/316L) to minimize HAZ sensitization; stabilized grades (321/347) where post-weld heat exposure exists.
  • BL (Blind): select by line metallurgy; 2205 where gasket crevices face chlorides.
  • RTJ / Orifice: ensure hardness within gasket supplier limits; duplex offers better crevice resistance.

Disclaimer: Values above are consolidated references for engineering selection. For guaranteed properties, specify standard (e.g., ASTM A182 F304L/F316L/F51), class, NDE, and MTC (EN 10204 3.1/3.2). Mechanical values for large flanges may trend toward lower bounds due to section size. Contact Navkar Metal Syndicate for project-specific data.

Applications

Navkar Metal Syndicate manufactures and supplies a complete range of Stainless Steel Flanges — including Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), Lap Joint (LJ), and Orifice / RTJ types — in grades ranging from J7, J4, 201, 202 to 304, 316, 321, 347, 409L, 430, 444, and S31803 (Duplex). These flanges are engineered to deliver leak-proof, corrosion-resistant, and pressure-rated connections across diverse industries and process environments.

A. Industry-Wise Applications

Oil, Gas & Petrochemical

  • Pipeline & manifold connections (WN, SO)
  • Refinery & petrochemical process lines
  • High-temperature & corrosive service (309, 310, 316, 321, 347)
  • Offshore platforms & subsea systems (Duplex S31803)

Chemical & Fertilizer Plants

  • Reactors, heat exchangers, and column internals
  • Corrosive fluid distribution systems
  • Acid piping and urea service lines (316Ti, 317L, 2205)
  • Instrumentation and orifice flanges for flow control

Marine & Offshore

  • Ballast & cooling water lines (316L, 2205)
  • Desalination plants and RO systems
  • Shipbuilding & dock piping systems (J4, 316Ti, 444)
  • Corrosion-resistant structural joints (LJ & SO types)

Power Generation

  • Steam & condensate systems (304H, 321H, 347H)
  • Boiler and turbine flange joints (310S, 316H)
  • Cooling tower distribution (Duplex S31803)
  • High-pressure header connections (WN, BL, RTJ)

Water Treatment & Infrastructure

  • Potable and wastewater distribution systems
  • Pumping station manifolds & coupling flanges
  • RO plant skid fabrication (304L, 316L)
  • Seawater intake & discharge lines (Duplex 2205)

Food, Beverage & Pharmaceutical

  • Sanitary & hygienic process pipelines (304L, 316L)
  • Clean steam and CIP circuits (316Ti)
  • Breweries, dairies & distilleries process lines
  • Threaded & socket weld flanges for small-bore equipment

Automotive & Exhaust Systems

  • Exhaust manifolds, catalytic converters (409L, 430, 441, 444)
  • Muffler flanges and turbocharger joints
  • Heat-resistant ferritic flange couplings
  • Lightweight low-Ni austenitic flanges (J4, J7)

Pulp & Paper / Textile / Cement

  • Bleaching & digestion pipelines (316L, 317L)
  • Effluent treatment manifolds (304L)
  • Process air & alkaline handling (321, 347)
  • Mechanical sealing & inspection flanges

Structural & Architectural

  • Support assemblies & aesthetic structural joints
  • Glass railing & facade systems (304/316 mirror finish)
  • Decorative & exposed connection elements

B. Grade-Wise Applications

Grade Application Summary Preferred Flange Types
J7 / J4 / 201 / 202 General fabrication, low-corrosion structural joints, decorative and low-Ni industrial flanges. SO, TH, LJ, SW
304 / 304L / 304H Universal stainless grade for water, oil, gas, and food industries. Widely used for pipelines, vents, manifolds. WN, SO, BL, SW, TH, LJ
316 / 316L / 316H / 316Ti / 317 / 317L Superior resistance to chlorides and chemicals; ideal for marine, chemical, and pharmaceutical piping systems. WN, BL, SO, RTJ, LJ
309 / 309S / 310 / 310S High-temperature service flanges in furnaces, reformers, incinerators, and exhaust systems. WN, BL, SO
321 / 321H / 347 / 347H Stabilized grades for high-temperature cyclic operations, boilers, and refinery heaters. WN, BL, RTJ
409L / 410 / 410S / 420 Ferritic/martensitic flanges for heat-resistant exhaust, ducting, and machinery housings. SO, TH, SW
429 / 430 / 430Ti / 439 / 441 / 444 Ferritic decorative & heat-resistant applications; automotive and architectural use. SO, TH, LJ
S31803 (Duplex 2205) High strength & chloride stress corrosion cracking resistance; offshore, desalination, and power plants. WN, BL, RTJ, LJ

C. Special Service Notes

  • High Pressure Systems: Prefer WN or RTJ flanges for superior stress distribution and sealing.
  • Corrosive Chemical Handling: 316L, 317L, 2205 grades resist pitting and crevice corrosion.
  • High Temperature: 310S, 321H, and 347H for long-term oxidation and creep resistance.
  • Hygienic Service: 304L and 316L with smooth bore and BA finish for sanitary installations.
  • Low Pressure / Threaded Connections: 304/316 TH and SO flanges for maintenance-friendly joints.

Navkar Metal Syndicate delivers stainless steel flanges in full compliance with ASME B16.5, B16.47, EN 1092-1, and DIN standards, complete with MTC (EN 10204 3.1) certification. Custom flanges are available for process-specific applications and offshore-certified projects.

Standards & International Equivalents:

Coverage for Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), Lap Joint (LJ), Orifice / RTJ flanges across grades J7, J4, 201, 202, 301, 302, 304, 304L, 304H, 305, 308, 309, 309S, 310, 310S, 316, 316L, 316H, 316Ti, 317, 317L, 321, 321H, 347, 347H, 409L, 410, 410S, 420, 429, 430, 430Ti, 439, 441, 444, S31803 (Duplex 2205).

A) Dimensional, Pressure & Facing Standards by Flange Type

Flange Type ASME / ANSI EN / ISO / DIN Pressure Range Facing Options Notes
Weld Neck (WN) B16.5 (Class 150–2500), B16.47 A/B (NPS ≥ 26) EN 1092-1 Type 11; ISO 7005-1; DIN 2631-2638 ASME Class 150–2500; PN 2.5–400 RF, FF, RTJ Long/short neck variants for special service.
Slip-On (SO) B16.5 EN 1092-1 Type 01/12; ISO 7005-1 Class 150–600 typical; PN 6–40 RF, FF Economical assembly; not for severe cyclic loads.
Blind (BL) B16.5, B16.47 A/B EN 1092-1 Type 05; ISO 7005-1 Class 150–2500; PN 2.5–400 RF, FF, RTJ Used to close line ends, test blinds, spades.
Socket Weld (SW) B16.5 EN 1092-1 Type 13 (where applicable) Class 150–600 typical RF Small-bore, high-integrity joints.
Threaded (TH) B16.5; threads per ASME B1.20.1 (NPT) EN 1092-1 Type 13; ISO thread forms Class 150–600 typical RF, FF No-weld installation; preferred for low-pressure/flam.
Lap Joint (LJ) B16.5 (with stub-end to B16.9) EN 1092-1 Type 02 Class 150–600 typical; PN 6–40 FF, RF (with stub-end face) For frequent dismantling / alignment adjustment.
Orifice / RTJ B16.36 (Orifice); B16.5 RTJ facings EN 1092-1 (custom orifice drilling to EN ISO 5167) Class 300–1500 common RTJ Meter runs with taps; ring-type joints for high pressure.

B) Material Standards & Grade Equivalents (Forged Flanges)

Material Standard Typical ASTM / ASME Common A182 Forging Grades UNS EN / WNR Typical Use / Examples
Austenitic SS ASTM A182 / ASME SA182 (forgings), A240 (plate), A479 (bar) F304 / F304L / F304H S30400 / S30403 / S30409 1.4301 / 1.4307 / 1.4948 General service, food & pharma, moderate temp (304H for HT).
F316 / F316L / F316H / F316Ti / F317L S31600 / S31603 / S31609 / S31635 / S31703 1.4401 / 1.4404 / 1.4919 / 1.4571 / 1.4438 Chlorides/chemicals, marine, hygienic service.
F309 / F309S / F310 / F310S S30900 / S30908 / S31000 / S31008 1.4828 / 1.4833 / 1.4841 / 1.4845 High-temperature oxidation resistance.
F321 / F321H ; F347 / F347H S32100 / S32109 ; S34700 / S34709 1.4541 / 1.4878 ; 1.4550 / 1.4961 Stabilized grades for HT cyclic/creep service.
Ferritic SS ASTM A182; A240 F409, F410S, F430, F441, F444 S40900, S41008, S43000, S43932, S44400 1.4512, 1.4000, 1.4016, 1.4509, 1.4521 Automotive exhaust, heat-resistant ducting, decorative.
F429, F430Ti S42900, (Ti-stabilized variants) — Stabilized ferritic for weldability & formability.
Martensitic SS ASTM A182; A240 F410, F420 S41000, S42000 1.4006, 1.4021 Hardness & wear resistance in moderate corrosion.
Duplex SS ASTM A182; A240 F51 / F60 (e.g., 2205), F53/F55 (super duplex) S31803/S32205, S32750/S32760 1.4462, 1.4410/1.4501 High strength, SCC resistance in chlorides (offshore/desal).
Low-Ni Cr-Mn (J grades) ASTM A182 (by UNS equivalence), Mill Specs F201 (S20100), F202 (S20200); J4/J7 per mill spec S20100 / S20200 / (J4/J7 – mill) 1.4372 / — Economical austenitics; confirm project acceptance.

C) Quick Reference — Facing & Drilling

Standard Facing Forms Drilling / Bolting Gasket Styles
ASME B16.5 / B16.47 RF, FF, RTJ, Large/Small Male-Female (M/F), Tongue-Groove (T/G) ASME bolt circle patterns; stud bolts per B16.5 Spiral wound, RTJ (R, RX, BX), Kammprofile, sheet
EN 1092-1 Type A/B raised face forms, Type C/D M/F, Type E/F T/G PN-based drilling; ISO metric studs/bolts EN-style spiral wound, envelope PTFE, graphite
ISO 7005-1 / DIN RF, FF (DIN forms) DIN bolt circles; property classes per ISO 898 DIN/EN gaskets; verify thickness/finish

Material Certs: Flanges supplied with EN 10204 3.1 MTCs. Surface finish, NDE, heat treatment, and PMI available on request.

Disclaimer: J4/J7 are commercial designations; confirm acceptance with project specifications. Always verify final rating, facing, bore, and drilling against design codes and datasheets.

Common Names & International Identifiers

Below table lists the common trade names, AISI, UNS, EN/WNR equivalents, and international identifiers for Stainless Steel Flanges manufactured by Navkar Metal Syndicate — available in Weld Neck (WN), Slip-On (SO), Blind (BL), Socket Weld (SW), Threaded (TH), Lap Joint (LJ), and Orifice / RTJ types.

Grade / Alloy AISI / Type UNS No. EN / WNR Equivalent Common / Trade Name Typical Application Area
J7 / J4 Cr–Mn–Ni Austenitic — (Commercial) — Jindal J4 / J7 Low-Ni Stainless General fabrication, decorative, low-cost flanges
201 201 S20100 1.4372 NITRONIC 201 / ASTM 201 Low-Ni alternative to 304; moderate corrosion resistance
202 202 S20200 — Cr–Mn–Ni Alloy Architectural, furniture, general service
301 301 S30100 1.4310 Extra High Strength SS Springs, high-strength flange rings
302 302 S30200 1.4319 Alloy 302 General austenitic stainless, flanges & valves
304 / 304L / 304H 304 Series S30400 / S30403 / S30409 1.4301 / 1.4307 / 1.4948 18/8 Stainless, CF8 / CF8H (casting) Universal flange material for water, oil & gas service
305 305 S30500 — Low Work Hardening Austenitic Deep drawing, forming, small threaded flanges
308 / 309 / 309S 308 / 309 / 309S S30800 / S30900 / S30908 1.4828 / 1.4833 Heat-Resisting Stainless High-temperature pipe & heater flange joints
310 / 310S 310 / 310S S31000 / S31008 1.4841 / 1.4845 Alloy 310 / 310S (Heat Resistant) Furnace, reformer & oxidation-resistant flanges
316 / 316L / 316H / 316Ti 316 Series S31600 / S31603 / S31609 / S31635 1.4401 / 1.4404 / 1.4919 / 1.4571 Marine Grade / Mo-bearing Alloy Marine, chemical & food-grade piping flanges
317 / 317L 317 / 317L S31700 / S31703 1.4449 / 1.4438 Alloy 317L (Extra Mo) Strong pitting resistance in chemical plants
321 / 321H 321 / 321H S32100 / S32109 1.4541 / 1.4878 Titanium-Stabilized SS High-temperature, anti-sensitization flange joints
347 / 347H 347 / 347H S34700 / S34709 1.4550 / 1.4961 Niobium-Stabilized SS Refinery & heat exchanger flanges
409L 409 S40900 1.4512 Ferritic 409L Automotive exhaust & duct flanges
410 / 410S 410 / 410S S41000 / S41008 1.4006 / 1.4000 Martensitic / Ferritic SS Machinery & turbine flange components
420 420 S42000 1.4021 Cutlery / Hardenable SS High strength, wear-resistant flange faces
429 / 430 / 430Ti 429 / 430 S42900 / S43000 1.4510 / 1.4016 / — Decorative Ferritic SS Exhaust, trim, architectural flange systems
439 / 441 / 444 Ferritic Series S43035 / S43932 / S44400 1.4510 / 1.4509 / 1.4521 Stabilized / Mo-bearing Ferritic Automotive, heat exchangers, corrosion-resistant systems
S31803 (Duplex) 2205 Duplex S31803 / S32205 1.4462 Duplex 2205 High strength, seawater & offshore flange systems

Note: Trade names and UNS/EN identifiers correspond to typical international equivalents for material selection. Flanges are manufactured as per ASTM A182 / ASME SA182 forging standards and supplied with EN 10204 3.1 Mill Test Certificates. Always verify grade and UNS equivalence for project specification before procurement.

Common Product Forms & Dimensions

Stainless Steel Flanges — Dimensional Data (ANSI/ASME B16.5)

Converted from your source text into structured HTML tables. Obvious typos in nominal sizes were corrected (e.g., “w” → 3/4, “14” → 1¼, “12” → 1½, “22” → 2½, “32” → 3½). All numeric values are preserved.

Weld Neck Flanges — Class 300 LB

Nominal Pipe Size Outside Diameter A Overall Diameter B Inside Diameter C Flange Thickness (min) D Overall Length E Diameter at Weld Bevel F Hub Diameter G Face Diameter H Number of Holes I Bolt Hole Dia J Bolt Circle Weight (kg/piece)
inmm inmm inmm inmm inmm inmm inmm inmm qty— inmm inmm
1/2 0.84021.30 3.50088.90 0.62015.70 0.44011.20 1.88047.80 0.84021.30 1.19030.20 1.38035.00 4— 0.62015.70 2.38060.45 0.48
3/4 1.05026.70 3.88098.60 0.82020.80 0.50012.70 2.06052.30 1.05026.70 1.50038.10 1.69042.90 4— 0.62015.70 2.75069.85 0.71
1 1.31533.40 4.250108.0 1.05026.70 0.56014.20 2.19055.60 1.32033.50 1.94049.30 2.00050.80 4— 0.62015.70 3.12079.25 1.01
1¼ 1.66042.20 4.620117.3 1.38035.10 0.62015.70 2.25057.15 1.66042.20 2.31058.70 2.50063.50 4— 0.62015.70 3.50088.90 1.33
1½ 1.90048.30 5.000127.0 1.61040.90 0.69017.50 2.44062.00 1.90048.30 2.56065.00 2.88073.15 4— 0.62015.70 3.88098.60 1.72
2 2.37560.30 6.000152.4 2.07052.60 0.75019.10 2.50063.50 2.38060.45 3.06077.70 3.62091.90 4— 0.75019.10 4.750120.7 2.58
2½ 2.87573.00 7.000177.8 2.47062.70 0.88022.40 2.75069.85 2.88073.15 3.56090.40 4.120104.6 4— 0.75019.10 5.500139.7 4.11
3 3.50088.90 7.500190.5 3.07078.00 0.94023.90 2.75069.85 3.50088.90 4.250108.0 5.000127.0 4— 0.75019.10 6.000152.4 4.92
3½ 4.000101.6 8.500215.9 3.55090.20 0.94023.90 2.81071.40 4.000101.6 4.810122.2 5.500139.7 8— 0.75019.10 7.000177.8 6.08
4 4.500114.3 9.000228.6 4.030102.4 0.94023.90 3.00076.20 4.500114.3 5.310134.9 6.190157.2 8— 0.75019.10 7.500190.5 6.84
5 5.563141.3 10.00254.0 5.050128.3 0.94023.90 3.50088.90 5.560141.2 6.440163.6 7.310185.7 8— 0.88022.40 8.500215.9 8.56
6 6.625168.3 11.00279.4 6.070154.2 1.00025.40 3.50088.90 6.630168.4 7.560192.0 8.500215.9 8— 0.88022.40 9.500241.3 10.6
8 8.625219.1 13.50342.9 7.980202.7 1.12028.40 4.000101.6 8.630219.2 9.690246.1 10.62269.7 8— 0.88022.40 11.75298.5 17.6
10 10.75273.0 16.00406.4 10.02254.5 1.19030.20 4.000101.6 10.75273.0 12.00304.8 12.75323.8 12— 1.00025.40 14.25362.0 24.0
12 12.75323.8 19.00482.6 12.00304.8 1.25031.75 4.500114.3 12.75323.8 14.38365.3 15.00381.0 12— 1.00025.40 17.00431.8 36.5
14 14.00355.6 21.00533.4 To be specified by Purchaser— 1.38035.10 5.000127.0 14.00355.6 15.75400.1 16.25412.7 12— 1.12028.40 18.75476.3 48.4
16 16.00406.4 23.50596.9 —— 1.44036.60 5.000127.0 16.00406.4 18.00475.2 18.50469.9 16— 1.12028.40 21.25539.8 60.6
18 18.00457.2 25.00635.0 —— 1.56039.60 5.500139.7 18.00457.2 19.88505.0 21.00533.4 16— 1.25031.75 22.75577.9 68.3
20 20.00508.0 27.50698.5 —— 1.69042.90 5.690144.5 20.00508.0 22.00558.8 23.00584.2 20— 1.25031.75 25.00635.0 84.5
24 24.00609.6 32.00812.8 —— 1.88047.80 6.000152.4 24.00609.6 26.12663.4 27.25692.1 20— 1.38035.10 29.50749.3 115

Notes (Class 300 LB): (1) Dimension B corresponds to the pipe inside diameter (assumes 40S/Standard wall). (2) Weights are approximate. (3) Flat face option may be full thickness C or with RF removed (nonstandard).

Weld Neck Flanges — Class 150 LB

Nominal Pipe Size Outside Diameter A Overall Diameter B Inside Diameter C Flange Thickness (min) D Overall Length E Diameter at Weld Bevel F Hub Diameter G Face Diameter H Number of Holes I Bolt Hole Dia J Bolt Circle Weight (kg/piece)
inmm inmm inmm inmm inmm inmm inmm inmm qty— inmm inmm
1/2 0.84021.30 3.75095.20 0.62015.70 0.56014.20 2.06052.30 0.84021.30 1.50038.10 1.38035.00 4— 0.62015.70 2.62066.55 0.75
3/4 1.05026.70 4.620117.3 0.82020.80 0.62015.70 2.25057.15 1.05026.70 1.88047.70 1.69042.90 4— 0.75019.00 3.25082.50 1.26
1 1.31533.40 4.880123.9 1.05026.70 0.69017.50 2.44062.00 1.32033.50 2.12053.80 2.00050.80 4— 0.75019.00 3.50088.90 1.52
1¼ 1.66042.20 5.250133.3 1.38035.10 0.75019.00 2.56065.00 1.66042.20 2.50063.50 2.50063.50 4— 0.75019.00 3.88098.50 2.03
1½ 1.90048.30 6.120155.4 1.61040.90 0.81020.60 2.69068.30 1.90048.30 2.75069.85 2.88073.15 4— 0.88022.30 4.500114.3 2.89
2 2.37560.30 6.500165.1 2.07052.60 0.88022.30 2.75069.85 2.38060.45 3.31084.00 3.62091.90 8— 0.75019.00 5.000127.0 3.40
2½ 2.87573.00 7.500190.5 2.47062.70 1.00025.40 3.00076.20 2.88073.15 3.940100.0 4.120104.6 8— 0.88022.30 5.880149.3 5.17
3 3.50088.90 8.250209.5 3.07078.00 1.12028.40 3.12079.25 3.50088.90 4.620117.3 5.000127.0 8— 0.88022.30 6.620168.1 6.93
3½ 4.000101.6 9.000228.6 3.55090.20 1.19030.20 3.19081.00 4.000101.6 5.250133.3 5.500139.7 8— 0.88022.30 7.250184.1 8.67
4 4.500114.3 10.00254.0 4.030102.4 1.25031.70 3.38085.80 4.500114.3 5.750146.0 6.190157.2 8— 0.88022.30 7.880200.1 11.2
5 5.563141.3 11.00279.4 5.050128.3 1.38035.00 3.88098.50 5.560141.2 7.000177.8 7.310185.7 8— 0.88022.30 9.250234.9 15.1
6 6.625168.3 12.50317.5 6.070154.2 1.44036.50 3.88098.50 6.630168.4 8.120206.2 8.500215.9 12— 0.88022.30 10.62269.7 19.1
8 8.625219.1 15.00381.0 7.980202.7 1.62041.10 4.380111.2 8.630219.2 10.25260.3 10.62269.7 12— 1.00025.40 13.00330.2 29.9
10 10.75273.0 17.50444.5 10.02254.5 1.88047.70 4.620117.3 10.75273.0 12.62320.5 12.75323.8 16— 1.12028.40 15.25387.3 42.7
12 12.75323.8 20.50520.7 12.00304.8 2.00050.80 5.120130.0 12.75323.8 14.75374.6 15.00381.0 16— 1.25031.70 17.75450.8 61.8
14 14.00355.6 23.00584.2 To be specified by Purchaser— 2.12053.80 5.620142.7 14.00355.6 16.75425.4 16.25412.7 20— 1.25031.70 20.25514.3 85.8
16 16.00406.4 25.50647.7 —— 2.25057.15 5.750146.0 16.00406.4 19.00482.6 18.50469.9 20— 1.38035.00 22.50571.5 106
18 18.00457.2 28.00711.2 —— 2.38060.45 6.250158.7 18.00457.2 21.00533.4 21.00533.4 24— 1.38035.00 24.75628.6 131
20 20.00508.0 30.50774.7 —— 2.50063.50 6.380162.0 20.00508.0 23.12587.2 23.00584.2 24— 1.38035.00 27.00685.8 158
24 24.00609.6 36.00914.4 —— 2.75069.85 6.620168.1 24.00609.6 27.62701.5 27.25692.1 24— 1.62041.10 32.00812.8 230

Notes (Class 150 LB): Weights are approximate; flat face available per note; see tolerance page reference.

Slip-On Flanges — Class 300 LB

Nominal Pipe Size Outside Diameter A Overall Diameter B Inside Diameter C Flange Thickness (min) D Overall Length F Hub Diameter G Face Diameter H Number of Holes I Bolt Hole Dia J Bolt Circle Weight (kg/piece)
inmm inmm inmm inmm inmm inmm inmm qty— inmm inmm
1/20.84021.303.50088.900.88022.400.44011.200.62015.701.19030.201.38035.104—0.62015.702.38060.450.39
3/41.05026.703.88098.601.09027.700.50012.700.62015.701.50038.101.69042.904—0.62015.702.75069.850.56
11.31533.404.250108.01.36034.500.56014.200.69017.501.94049.302.00050.804—0.62015.703.12079.250.78
1¼1.66042.204.620117.31.70043.200.62015.700.81020.602.31058.702.50063.504—0.62015.703.50088.901.03
1½1.90048.305.000127.01.95049.500.69017.500.88022.402.56065.002.88073.154—0.62015.703.88098.601.32
22.37560.306.000152.42.44062.000.75019.101.00025.403.06077.703.62091.904—0.75019.104.750120.72.06
2½2.87573.007.000177.82.94074.700.88022.401.12028.403.56090.404.120104.64—0.75019.105.500139.73.28
33.50088.907.500190.53.57090.700.94023.901.19030.204.250108.05.000127.04—0.75019.106.000152.43.85
3½4.000101.68.500215.94.070103.40.94023.901.25031.754.810122.25.500139.78—0.75019.107.000177.84.81
44.500114.39.000228.64.570116.10.94023.901.31033.305.310134.96.190157.28—0.75019.107.500190.55.30
55.563141.310.00254.05.660143.80.94023.901.44036.606.440163.67.310185.78—0.88022.408.500215.96.07
66.625168.311.00279.46.720170.71.00025.401.56039.607.560192.08.500215.98—0.88022.409.500241.37.45
88.625219.113.50342.98.720221.51.12028.401.75044.509.690246.110.62269.78—0.88022.4011.75298.512.1
1010.75273.016.00406.410.88276.31.19030.201.94049.3012.00304.812.75323.912—1.00025.4014.25362.016.5
1212.75323.819.00482.612.88327.11.25031.752.19055.6014.38365.315.00381.012—1.00025.4017.00431.826.2
1414.00355.621.00533.414.14359.11.38035.102.25057.1515.75400.116.25412.812—1.12028.4018.75476.334.6
1616.00406.423.50596.916.16410.51.44036.602.50063.5018.00457.218.50469.916—1.12028.4021.25539.844.8
1818.00457.225.00635.018.18461.81.56039.602.69068.3019.88505.021.00533.416—1.25031.7522.75577.948.9
2020.00508.027.50698.520.20513.11.69042.902.88073.1522.00558.823.00584.220—1.25031.7525.00635.061.9
2424.00609.632.00812.824.25616.01.88047.803.25082.6026.12663.427.25692.220—1.38035.1029.50749.386.9

Weights approximate; flat face notes and tolerances per your reference.

Slip-On Flanges — Class 150 LB

Nominal Pipe Size Outside Diameter A Overall Diameter B Inside Diameter C Flange Thickness (min) D Overall Length F Hub Diameter G Face Diameter H Number of Holes I Bolt Hole Dia J Bolt Circle Weight (kg/piece)
inmm inmm inmm inmm inmm inmm inmm qty— inmm inmm
1/20.84021.303.75095.200.88022.400.56014.200.88022.401.50038.101.38035.104—0.62015.702.62066.550.64
3/41.05026.704.620117.31.09027.700.62015.701.00025.401.88047.701.69042.904—0.75019.103.25082.501.12
11.31533.404.880123.91.36034.500.69017.501.06026.902.12053.802.00050.804—0.75019.103.50088.901.36
1¼1.66042.205.250133.31.70043.200.75019.001.06026.902.50063.502.50063.504—0.75019.103.88098.601.68
1½1.90048.306.120155.41.95049.500.81020.601.19030.202.75069.852.88073.154—0.88022.404.500114.32.49
22.37560.306.500165.12.44062.000.88022.301.31033.203.31084.003.62091.908—0.75019.105.000127.02.87
2½2.87573.007.500190.52.94074.701.00025.401.50038.103.940100.04.120104.68—0.88022.405.880149.44.32
33.50088.908.250209.53.57090.701.12028.401.69042.904.620117.35.000127.08—0.88022.406.620168.15.85
3½4.000101.69.000228.64.070103.41.19030.201.75044.405.250133.35.500139.78—0.88022.407.250184.27.34
44.500114.310.00254.04.570116.11.25031.701.88047.705.750146.06.190157.28—0.88022.407.880200.19.61
55.563141.311.00279.45.660143.81.38035.002.00050.807.000177.87.310185.78—0.88022.409.250234.912.3
66.625168.312.50317.56.720170.71.44036.502.06052.308.120206.28.500215.912—0.88022.4010.62269.715.6
88.625219.115.00381.08.720221.51.62041.102.44061.9010.25260.310.62269.712—1.00025.4013.00330.224.2
1010.75273.017.50444.510.88276.31.88047.702.62066.5512.62320.512.75323.916—1.12028.4015.25387.334.1
1212.75323.820.50520.712.88327.12.00050.802.88073.1514.75374.615.00381.016—1.25031.7017.75450.849.8
1414.00355.623.00584.214.14359.12.12053.803.00076.2016.75425.416.25412.820—1.25031.7020.25514.469.9
1616.00406.425.50647.716.16410.52.25057.153.25082.5019.00482.618.50469.920—1.38035.0022.50571.588.1
1818.00457.228.00711.218.18461.82.38060.453.50088.9021.00533.421.00533.424—1.38035.0024.75628.7109
2020.00508.030.50774.720.20513.12.50063.503.75095.2023.12587.223.00584.224—1.38035.0027.00685.8134
2424.00609.636.00914.424.25616.02.75069.854.190106.427.62701.527.25692.224—1.62041.0032.00812.8201

Blind Flanges — Class 300 LB

Nominal Pipe Size Outside Diameter A Overall Diameter C Flange Thickness (min) G Face Diameter H Number of Holes I Bolt Hole Dia J Bolt Circle Weight (kg/piece)
inmm inmm inmm inmm qty— inmm inmm
1/20.84021.303.50088.900.44011.201.38035.104—0.62015.702.38060.450.42
3/41.05026.703.88098.600.50012.701.69042.904—0.62015.702.75069.850.61
11.31533.404.250108.00.56014.202.00050.804—0.62015.703.12079.250.86
1¼1.66042.204.620117.30.62015.702.50063.504—0.62015.703.50088.901.17
1½1.90048.305.000127.00.69017.502.88073.154—0.62015.703.88098.601.53
22.37560.306.000152.40.75019.103.62091.904—0.75019.104.750120.72.42
2½2.87573.007.000177.80.88022.404.120104.64—0.75019.105.500139.73.94
33.50088.907.500190.50.94023.905.000127.04—0.75019.106.000152.44.93
3½4.000101.68.500215.90.94023.905.500139.78—0.75019.107.000177.86.17
44.500114.39.000228.60.94023.906.190157.28—0.75019.107.500190.57.00
55.563141.310.00254.00.94023.907.310185.78—0.88022.408.500215.98.63
66.625168.311.00279.41.00025.408.500215.98—0.88022.409.500241.311.3
88.625219.113.50342.91.12028.4010.62269.78—0.88022.4011.75298.519.6
1010.75273.016.00406.41.19030.2012.75323.912—1.00025.4014.25362.028.8
1212.75323.819.00482.61.25031.7515.00381.012—1.00025.4017.00431.843.2
1414.00355.621.00533.41.38035.1016.25412.812—1.12028.4018.75476.358.1
1616.00406.423.50596.91.44036.6018.50469.916—1.12028.4021.25539.876.0
1818.00457.225.00635.01.56039.6021.00533.416—1.25031.7522.75577.993.7
2020.00508.027.50698.51.69042.9023.00584.220—1.25031.7525.00635.0122
2424.00609.632.00812.81.88047.8027.25692.220—1.38035.1029.50749.3185

Weights approximate; flat face and tolerance notes apply.

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