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Descriptions
Navkar Metal Syndicate is a trusted manufacturer, stockist, and exporter of Stainless Steel Fittings including Butt Weld Pipe Fittings, Forged / Threaded Fittings, Sanitary Fittings, and Flanges used across industries such as chemical, oil & gas, food processing, marine, and power generation. Our stainless steel fittings are engineered for high strength, corrosion resistance, and leak-proof performance, ensuring durability and reliability even in the most demanding environments.
Material Grades Available
We supply fittings in a wide range of stainless steel grades to meet specific mechanical and corrosion resistance requirements:
- Austenitic Grades: 304, 304L, 304H, 316, 316L, 316Ti, 321, 321H, 347, 347H
- Ferritic Grades: 409, 409L, 410, 430, 439, 441, 444
- Martensitic Grades: 410S, 420, 431
- Duplex & Super Duplex Grades: S31803 (2205), S32205, S32750 (2507)
- Special Grades: 904L, 317L, 310, 310S
Manufacturing Range & Sizes
- Size Range: ½” NB to 48” NB (Seamless & Welded)
- Schedule: SCH 5S, 10S, 20, 40, 80, 160, XXS
- End Connections: Butt Weld, Socket Weld, Threaded (BSP/NPT), and Flanged
- Standards: ASTM A403 / ASME SA403, ASTM A182 / A276 / A351, EN 10253, MSS-SP43, MSS-SP79, DIN 2605
Types of Stainless Steel Fittings
- Elbows (45°, 90°, 180° — Short / Long Radius)
- Equal & Reducing Tees
- Reducers (Concentric / Eccentric)
- Caps & Stub Ends
- Cross Fittings
- Couplings (Full / Half / Reducing)
- Unions (Socket Weld / Threaded)
- Hex Nipples & Barrel Nipples
- Bends (Seamless / Welded)
- Olets (Sockolet, Weldolet, Threadolet)
- Bosses, Inserts & Adapters
- Instrumentation Fittings
- Flanges (Slip-On, Weld Neck, Blind, Threaded, Lap Joint)
- Hygienic / Sanitary Fittings (Tri-Clamp, Ferrules, Reducers, Elbows)
- Compression Fittings
- Custom Fabricated Pipe Fittings
- High-Pressure Forged Fittings
- Machined Components & Special Connectors
Product Forms
- Seamless & Welded Butt Weld Pipe Fittings
- Threaded & Socket Weld Forged Fittings
- Sanitary / Dairy Fittings (Polished Surface, Tri-Clamp)
- Compression & Instrumentation Tube Fittings
- Flanged Connections (ANSI / DIN / JIS)
Surface Finish & Testing
- Finishes: Mirror / Pickled / Bright Annealed / Matte / Electro-Polished
- Testing: Hydrostatic Test, PMI, Ultrasonic, Hardness, and Visual Inspection
- Certifications: MTC as per EN 10204 3.1 / 3.2, ISO 9001:2015 Certified Plant
Chemical Composition
The following table lists the typical chemical composition (% by weight) of stainless steel grades used for Stainless Steel Fittings manufactured and supplied by Navkar Metal Syndicate. These compositions comply with ASTM, ASME, EN, and JIS specifications and ensure excellent corrosion resistance, weldability, and mechanical strength across different industrial applications.
| Grade | C % | Mn % | Si % | P % | S % | Cr % | Ni % | Mo % | N % |
|---|---|---|---|---|---|---|---|---|---|
| J7 | 0.08 max | 8.0–10.0 | 1.0 | 0.045 | 0.03 | 16.0–17.0 | 1.0–2.0 | – | – |
| J4 | 0.10 max | 8.0–10.0 | 1.0 | 0.045 | 0.03 | 16.0–18.0 | 1.0–2.0 | – | – |
| 201 | 0.15 max | 5.5–7.5 | 1.00 | 0.060 | 0.030 | 16.0–18.0 | 3.5–5.5 | – | – |
| 202 | 0.15 max | 7.5–10.0 | 1.00 | 0.060 | 0.030 | 17.0–19.0 | 4.0–6.0 | – | – |
| 301 | 0.15 max | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 6.0–8.0 | – | – |
| 302 | 0.15 max | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 8.0–10.0 | – | – |
| 304 | 0.08 max | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–10.5 | – | – |
| 304L | 0.03 max | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–12.0 | – | – |
| 304H | 0.04–0.10 | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–10.5 | – | – |
| 305 | 0.12 max | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 10.5–13.0 | – | – |
| 308 | 0.08 max | 2.00 | 0.75 | 0.045 | 0.030 | 19.0–21.0 | 10.0–12.0 | – | – |
| 309 / 309S | 0.08 max | 2.00 | 1.00 | 0.045 | 0.030 | 22.0–24.0 | 12.0–15.0 | – | – |
| 310 / 310S | 0.08 max | 2.00 | 1.50 | 0.045 | 0.030 | 24.0–26.0 | 19.0–22.0 | – | – |
| 316 | 0.08 max | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | – |
| 316L | 0.03 max | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | – |
| 316H | 0.04–0.10 | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | – |
| 316Ti | 0.08 max | 2.00 | 1.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | +Ti 5×C min |
| 317 / 317L | 0.08 max / 0.03 max | 2.00 | 1.00 | 0.045 | 0.030 | 18.0–20.0 | 11.0–15.0 | 3.0–4.0 | – |
| 321 / 321H | 0.08 max / 0.04–0.10 | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 9.0–12.0 | – | +Ti 5×C min |
| 347 / 347H | 0.08 max / 0.04–0.10 | 2.00 | 1.00 | 0.045 | 0.030 | 17.0–19.0 | 9.0–13.0 | – | +Nb/Ta 10×C |
| 409L | 0.03 max | 1.00 | 1.00 | 0.040 | 0.030 | 10.5–11.75 | 0.5 max | – | – |
| 410 / 410S | 0.15 max / 0.08 max | 1.00 | 1.00 | 0.040 | 0.030 | 11.5–13.5 | 0.75 max | – | – |
| 420 | 0.16–0.25 | 1.00 | 1.00 | 0.040 | 0.030 | 12.0–14.0 | – | – | – |
| 429 | 0.12 max | 1.00 | 1.00 | 0.040 | 0.030 | 15.0–16.0 | – | – | – |
| 430 / 430Ti | 0.12 max | 1.00 | 1.00 | 0.040 | 0.030 | 16.0–18.0 | – | – | +Ti 5×C min |
| 439 | 0.03 max | 1.00 | 1.00 | 0.040 | 0.030 | 17.0–19.0 | 0.5 max | – | +Ti/Nb stabilized |
| 441 | 0.03 max | 1.00 | 1.00 | 0.040 | 0.030 | 17.5–18.5 | 1.0 max | – | +Ti+Nb |
| 444 | 0.025 max | 1.00 | 1.00 | 0.040 | 0.030 | 17.5–19.5 | 1.0 max | 1.75–2.50 | +Nb/Ti |
| S31803 (Duplex 2205) | 0.03 max | 2.00 | 1.00 | 0.030 | 0.020 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 |
Mechanical, Physical & Fabrication Properties
Navkar Metal Syndicate offers Threaded, Butt Weld, Socket Weld, and Flanged Stainless Steel Fittings manufactured as per international standards. These fittings are produced from a variety of stainless steel grades (J7, J4, 201, 202, 304, 304L, 316, 321, 347, 410, 430, 444, S31803, etc.) to deliver optimum performance in corrosion resistance, strength, pressure handling, and weldability.
1. Mechanical Properties (Typical Values for Stainless Steel Grades)
| Grade | Tensile Strength (MPa) | Yield Strength 0.2% (MPa) | Elongation (%) | Hardness (HB) | Density (g/cm³) | Melting Point (°C) |
|---|---|---|---|---|---|---|
| J7 / J4 | 520–680 | 240 | 40 | 200 | 7.9 | 1400–1450 |
| 201 / 202 | 515–750 | 275 | 40 | 210 | 7.8 | 1400–1450 |
| 301 / 302 | 620–860 | 260 | 40 | 200 | 7.9 | 1400–1450 |
| 304 / 304L / 304H | 515–750 | 205 | 40 | 201 | 7.9 | 1400–1450 |
| 305 / 308 | 515–690 | 205 | 40 | 200 | 7.9 | 1400–1450 |
| 309 / 309S | 550–750 | 240 | 40 | 200 | 7.9 | 1390–1454 |
| 310 / 310S | 515–760 | 205 | 40 | 192 | 7.9 | 1400–1450 |
| 316 / 316L / 316H / 316Ti | 515–760 | 205 | 40 | 217 | 8.0 | 1375–1400 |
| 317 / 317L | 515–760 | 205 | 40 | 217 | 8.0 | 1370–1400 |
| 321 / 321H | 515–750 | 205 | 40 | 201 | 7.9 | 1390–1454 |
| 347 / 347H | 515–750 | 205 | 40 | 201 | 7.9 | 1390–1454 |
| 409L | 380–450 | 170 | 25 | 170 | 7.7 | 1450–1510 |
| 410 / 410S | 450–700 | 275 | 20 | 200 | 7.75 | 1480–1530 |
| 420 | 650–850 | 345 | 20 | 250 | 7.75 | 1480–1530 |
| 429 / 430 / 430Ti | 450–700 | 275 | 25 | 200 | 7.75 | 1450–1510 |
| 439 / 441 / 444 | 430–700 | 250 | 30 | 200 | 7.75 | 1450–1510 |
| S31803 (Duplex 2205) | 620–880 | 450 | 25 | 290 | 7.8 | 1350–1440 |
2. Physical Properties
- Modulus of Elasticity: 193 GPa (Austenitic), 200 GPa (Ferritic/Martensitic), 200 GPa (Duplex)
- Thermal Conductivity: 14–16 W/m·K for 300 series, 25 W/m·K for ferritic grades
- Coefficient of Thermal Expansion: 16–17 ×10-6/°C (Austenitic), 10–11 ×10-6/°C (Duplex)
- Specific Heat Capacity: 500 J/kg·K (approx.)
- Electrical Resistivity: 0.72 µΩ·m for 304/316 grades
- Magnetic Properties: Non-magnetic (Austenitic), Magnetic (Ferritic/Martensitic)
3. Fabrication Properties by Fitting Type
Threaded Fittings
- Manufactured as per ASME B16.11 / BS 3799.
- Excellent machinability and pressure retention.
- Suitable for low-to-moderate pressure applications.
- Thread forms: BSP, NPT, and metric available.
- Used for quick assembly and disassembly in piping systems.
Butt Weld Fittings
- Manufactured as per ASME B16.9 / MSS-SP43.
- Ensures leak-proof joints and high structural integrity.
- Ideal for high-pressure and high-temperature service.
- Available in seamless and welded forms, pickled or mirror polished.
- Extensively used in process piping and pressure vessel fabrication.
Socket Weld Fittings
- Manufactured as per ASME B16.11.
- Excellent for small diameter, high-pressure pipelines.
- Provides easy alignment and high strength joints.
- Used in hydraulic, steam, and chemical process lines.
Flanged Fittings
- Manufactured to ASME B16.5 / B16.47 / DIN / JIS.
- Allows easy dismantling and maintenance of pipelines.
- Pressure ratings: Class 150, 300, 600, 900, 1500, 2500.
- Types: Slip-on, Weld Neck, Blind, Threaded, Lap Joint, Orifice.
- Used in refineries, shipbuilding, and desalination plants.
Each fitting undergoes hydrostatic, PMI, hardness, and dimensional testing to ensure conformity with ASTM and ASME standards. Stainless steel fittings by Navkar Metal Syndicate are known for their high mechanical strength, smooth weldability, and superior corrosion resistance, making them ideal for critical industrial and marine applications.
Applications
Navkar Metal Syndicate manufactures and supplies Threaded, Butt Weld, Socket Weld, and Flanged Stainless Steel Fittings in multiple grades including J7, J4, 201, 202, 304, 316, 321, 347, 410, 430, 444, and S31803 Duplex. These fittings are designed to perform under a wide range of pressures, temperatures, and corrosive conditions, making them ideal for both industrial and architectural piping systems.
1. Threaded Stainless Steel Fittings – Applications
- Used for quick installation and maintenance where welding is not feasible.
- Ideal for low-to-moderate pressure lines in chemical and process plants.
- Grades 304, 316, 321: General plumbing, food & beverage lines, and chemical transport.
- Grades 410, 430: Used in water supply, non-corrosive gas, and mechanical systems.
- J4 / 201 / 202: Suitable for domestic water, structural piping, and decorative use.
- Compressed air & hydraulic systems.
- Oil & Gas pipelines and refinery equipment.
- Firefighting & HVAC systems.
- Pharmaceutical and sanitary piping networks.
- Textile, dairy, and paper industry connections.
2. Butt Weld Stainless Steel Fittings – Applications
- Used in permanent, high-pressure, and high-temperature systems.
- Grades 304/304L/316/316L: Common in chemical plants, pressure vessels, and heat exchangers.
- 310/310S: Employed in furnaces, incinerators, and thermal process piping.
- 321/347: High-temperature and fatigue-resistant systems.
- S31803 Duplex: Ideal for seawater and offshore pipelines with superior strength and corrosion resistance.
- Petrochemical & fertilizer process pipelines.
- Power generation & boiler feed systems.
- Oil refineries & desalination plants.
- Pharmaceutical and food-grade fluid transport.
- Marine & offshore structural piping.
3. Socket Weld Stainless Steel Fittings – Applications
- Used where leakage-proof joints and strength are critical in small diameter piping.
- 304/316 Grades: Suitable for high-pressure steam, air, gas, and chemical flow lines.
- 410/420 Grades: Employed in pump housings, valve assemblies, and general engineering parts.
- High-pressure hydraulic and instrumentation systems.
- Used in compact plant rooms and machinery where space is limited.
- Petrochemical & refinery installations.
- Boiler feed, water treatment, and compressor systems.
- Paper, pulp & sugar industries.
- Heavy equipment lubrication and air piping systems.
- Shipbuilding and power plant steam lines.
4. Flanged Stainless Steel Fittings – Applications
- Used for easy assembly, inspection, and dismantling of pipelines.
- 304/316: Common in water supply, chemical, and food processing lines.
- 310S / 321: For heat exchangers and furnace manifolds.
- Duplex 2205: Ideal for marine, oil & gas, and desalination applications.
- Ferritic Grades (409L, 430, 441): Applied in exhaust, muffler, and automotive systems.
- Oil refineries and natural gas processing.
- Desalination & water treatment facilities.
- Power generation & nuclear applications.
- Pharmaceutical and clean room facilities.
- Breweries, dairies, and beverage process plants.
5. Industry-Wise Applications
- Oil & Gas Refineries
- Chemical & Petrochemical Plants
- Power Generation & Energy Sector
- Pharmaceutical & Biotech
- Food & Beverage Processing
- Water Treatment & Desalination
- Marine & Offshore Platforms
- HVAC & Firefighting Systems
- Paper & Pulp Industry
- Automotive & Exhaust Systems
- Architectural & Structural Projects
- Instrumentation & Process Control
With their superior corrosion resistance, strength, and durability, Navkar Metal Syndicate Stainless Steel Fittings are used in critical applications worldwide — offering long service life, precision-engineered performance, and compliance with ASTM, ASME, EN, and DIN standards.
Standards & International Equivalents:
Applicable to 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, and Duplex S31803 (UNS S31803 / 2205). Certification per EN 10204 3.1 / 3.2 available.
Threaded & Socket Weld Fittings (Forged)
| Scope | ASTM / ASME (Material) | ASME / ANSI (Dimensions) | EN / DIN / ISO | JIS | Notes / Pressure Class |
|---|---|---|---|---|---|
| Forged SS fittings (SW / THD) | ASTM A182 (F304/L/H, F316/L/H, F321, F347, F310, etc.) Duplex: ASTM A182 F51 (S31803) |
ASME B16.11 (Socket-Weld & Threaded) Threads: ASME B1.20.1 (NPT) |
EN 10222-5 (forgings); ISO 7-1 / EN 10226 (taper threads) | JIS B0203 (pipe threads) JIS B2316 (forged fittings) |
Classes: 2000 / 3000 / 6000 (lb) Also MSS SP-79, SP-83, SP-95 (olets), SP-97 |
Butt Weld Fittings (Wrought)
| Scope | ASTM / ASME (Material) | ASME / MSS (Dimensions) | EN / DIN / ISO | JIS | Notes / Thickness Series |
|---|---|---|---|---|---|
| Austenitic SS elbows, tees, reducers, caps | ASTM A403 WP304/L/H, WP316/L/H, WP321/H, WP347/H, WP310/S, etc. | ASME B16.9 (factory-made BW); MSS SP-43 (light-gauge austenitic) | EN 10253-3 (austenitic) & 10253-4 (austenitic & ferritic); DIN 2605 (elbows), 2615 (tees), 2616 (reducers) | JIS B2311, B2312, B2313 (BW fittings) | SCH 5S / 10S / 40S / 80S / 160 / XXS per ASME B36.19M (SS) / B36.10M |
| Duplex SS (S31803 / 2205) BW fittings | ASTM A815 WPS S31803 (Duplex) | ASME B16.9 | EN 10253-4 (Duplex) | JIS per product form | Enhanced corrosion & strength for seawater / chloride service |
Flanged Fittings / Pipe Flanges
| Scope | ASTM / ASME (Material) | ASME / ANSI (Dimensions) | EN / DIN / ISO | JIS | Notes / Pressure Class |
|---|---|---|---|---|---|
| Weld Neck, Slip-On, Blind, SW, THD, Lap-Joint | ASTM A182 F304/L/H, F316/L/H, F321, F347, F310, etc.; Plate flanges: ASTM A240 (304/L, 316/L, etc.) |
ASME B16.5 (NPS ½–24, Class 150–2500) ASME B16.47 Series A/B (NPS 26–60) Facing: ASME B16.5 RF/RTJ |
EN 1092-1 (PN 2.5–400); DIN 2576, 2633, etc. | JIS B2220 (JIS 10K/16K/20K, etc.) | Gaskets per ASME B16.20 (spiral wound, RTJ) Bolt sets per ASME B18 series |
| Duplex SS (S31803 / 2205) flanges | ASTM A182 F51; Plate: ASTM A240 S31803 | ASME B16.5 / B16.47 | EN 1092-1 | JIS B2220 | Preferred for chloride / seawater duties |
Material Cross-Reference (Indicative)
| Group | UNS / AISI | Common EN Name | Forged Component Spec | BW Fittings Spec | Plate / Sheet Spec |
|---|---|---|---|---|---|
| 304 / 304L / 304H | S30400 / S30403 / S30409 | 1.4301 / 1.4307 / 1.4948 | ASTM A182 F304/L/H | ASTM A403 WP304/L/H | ASTM A240 304/L |
| 316 / 316L / 316H / 316Ti | S31600 / S31603 / S31609 / S31635 | 1.4401 / 1.4404 / 1.4919 / 1.4571 | ASTM A182 F316/L/H/Ti | ASTM A403 WP316/L/H/Ti | ASTM A240 316/L |
| 321 / 321H | S32100 / S32109 | 1.4541 / 1.4878 | ASTM A182 F321/H | ASTM A403 WP321/H | ASTM A240 321 |
| 347 / 347H | S34700 / S34709 | 1.4550 / 1.4912 | ASTM A182 F347/H | ASTM A403 WP347/H | ASTM A240 347 |
| 310 / 310S | S31000 / S31008 | 1.4841 / 1.4845 | ASTM A182 F310/S | ASTM A403 WP310/S | ASTM A240 310/310S |
| Ferritic (409L / 430 / 441 / 444) | S40910 / S43000 / S44100 / S44400 | 1.4512 / 1.4016 / 1.4509 / 1.4521 | ASTM A182 (grade-specific, where applicable) | EN 10253-4 (ferritic / austenitic) | ASTM A240 (plate), EN 10088 |
| Duplex 2205 | S31803 / S32205 | 1.4462 | ASTM A182 F51 / F60 | ASTM A815 WPS S31803 | ASTM A240 S32205 |
Quality, Testing & Ancillary Standards
- Inspection / Certification: EN 10204 3.1 / 3.2; PMI, Hydro, NDT (UT/RT/DP/MPI) as ordered.
- Corrosion Service: NACE MR0175 / ISO 15156 (sour service) where specified.
- Welding Ends: ASME B16.25 (BW end preparation); flange facings per ASME B16.5.
- Pipe Compatibility: ASME B36.19M (SS pipe) / B36.10M (CS), schedule matching per design.
Common Names & International Identifiers
Stainless steel fittings—whether Threaded, Butt Weld, Socket Weld, or Flanged—are manufactured from internationally recognized grades and specifications. Each grade has corresponding AISI, UNS, EN, DIN, WNR, and JIS identifiers to ensure compatibility and traceability across global standards. Below is a comprehensive chart of common names and identifiers for stainless steel fitting materials supplied by Navkar Metal Syndicate.
1. Common Names & Identifiers (All Fitting Types)
| Grade | AISI / Trade Name | UNS Number | EN / DIN Equivalent | WNR Number | JIS Equivalent | Common Trade / Alias Name |
|---|---|---|---|---|---|---|
| J7 / J4 | Cr-Mn Austenitic | — | — | — | JIS SUS201LN (approx.) | Low Ni Chrome-Manganese SS |
| 201 | Stainless 201 | S20100 | 1.4372 | 1.4372 | SUS201 | Austenitic Low Ni SS |
| 202 | Stainless 202 | S20200 | 1.4373 | 1.4373 | SUS202 | Cr-Mn-N SS |
| 301 | Stainless 301 | S30100 | 1.4310 | 1.4310 | SUS301 | High Strength Austenitic |
| 302 | Stainless 302 | S30200 | 1.4319 | 1.4319 | SUS302 | 18-8 Cr-Ni SS |
| 304 / 304L / 304H | Stainless 304 Series | S30400 / S30403 / S30409 | 1.4301 / 1.4307 / 1.4948 | 1.4301 / 1.4307 / 1.4948 | SUS304 / SUS304L / SUS304H | 18-8 Stainless, Food Grade SS |
| 305 | Stainless 305 | S30500 | 1.4303 | 1.4303 | SUS305 | Low Work-Hardening Austenitic |
| 308 | Stainless 308 | S30800 | — | — | SUS308 | Welding Alloy, Heat Resistant |
| 309 / 309S | Stainless 309 / 309S | S30900 / S30908 | 1.4828 / 1.4833 | 1.4828 / 1.4833 | SUS309 / SUS309S | Heat-Resistant Austenitic |
| 310 / 310S | Stainless 310 / 310S | S31000 / S31008 | 1.4841 / 1.4845 | 1.4841 / 1.4845 | SUS310 / SUS310S | Heat-Resistant 25Cr–20Ni |
| 316 / 316L / 316H / 316Ti | Stainless 316 Series | S31600 / S31603 / S31609 / S31635 | 1.4401 / 1.4404 / 1.4919 / 1.4571 | 1.4401 / 1.4404 / 1.4571 | SUS316 / SUS316L / SUS316Ti | Marine Grade / Mo Bearing |
| 317 / 317L | Stainless 317 Series | S31700 / S31703 | 1.4449 / 1.4438 | 1.4449 / 1.4438 | SUS317 / SUS317L | High Mo Corrosion-Resistant SS |
| 321 / 321H | Stainless 321 | S32100 / S32109 | 1.4541 / 1.4878 | 1.4541 / 1.4878 | SUS321 / SUS321H | Ti-Stabilized Austenitic |
| 347 / 347H | Stainless 347 | S34700 / S34709 | 1.4550 / 1.4912 | 1.4550 / 1.4912 | SUS347 / SUS347H | Nb-Stabilized Austenitic |
| 409L | Stainless 409L | S40900 | 1.4512 | 1.4512 | SUS409L | Ferritic Automotive Exhaust SS |
| 410 / 410S | Stainless 410 / 410S | S41000 / S41008 | 1.4006 / 1.4000 | 1.4006 / 1.4000 | SUS410 / SUS410S | Martensitic, Hardenable SS |
| 420 | Stainless 420 | S42000 | 1.4021 | 1.4021 | SUS420J1 / J2 | Cutlery & Tool Grade SS |
| 429 | Stainless 429 | S42900 | 1.4000 | 1.4000 | SUS429 | Ferritic, Heat-Resistant |
| 430 / 430Ti | Stainless 430 / 430Ti | S43000 / S43036 | 1.4016 / 1.4510 | 1.4016 / 1.4510 | SUS430 / SUS430Ti | Decorative, Magnetic SS |
| 439 / 441 / 444 | Ferritic Series | S43035 / S43940 / S44400 | 1.4510 / 1.4509 / 1.4521 | 1.4509 / 1.4521 | SUS441 / SUS444 | Stabilized Ferritic SS (Ti/Nb) |
| S31803 (Duplex 2205) | Duplex 2205 | S31803 / S32205 | 1.4462 | 1.4462 | SUS329J3L | Duplex Cr-Ni-Mo SS |
2. Fitting Type Reference by Standard
Threaded & Socket Weld Fittings
- Manufacturing Material: ASTM A182 (Forged Stainless)
- Dimensions per ASME B16.11 / Threads per ASME B1.20.1
- Common Grades: 304 / 304L / 316 / 316L / 321 / 347 / S31803
- Classes: 2000, 3000, 6000
- Applications: Chemical, Hydraulic, Steam, and Food Lines
Butt Weld & Flanged Fittings
- Material: ASTM A403 (Wrought), ASTM A182 (Forged)
- Dimensional Standards: ASME B16.9 (BW), ASME B16.5 / B16.47 (Flanges)
- Common Grades: 304 / 316 / 321 / 347 / 310 / Duplex 2205
- EN / DIN Equivalents: EN 10253-3, EN 1092-1, DIN 2605–2616
- JIS: B2311, B2220 (Flanges)
These identifiers help ensure material traceability and compliance with ASTM, ASME, EN, DIN, JIS, and ISO standards across different markets. Each stainless steel fitting supplied by Navkar Metal Syndicate is clearly marked with its grade and specification to meet global engineering requirements.
Common Product Forms & Dimensions
Dimensions of Stainless Steel Pipe Fittings
| Size (Inch) | OD | Crosses C | 90° Elbows Long R A | 90° Elbows Short R A | 45° Elbows B | Tees C | Caps E | W.T ST | W.T XS | Stub Ends F | Stub Ends G |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 22 | 22.000 | 16-1/2 | 33 | - | 13-1/2 | 16-1/2 | 10 | 0.375 | 0.500 | - | - |
| 2-1/2 | 2.875 | 3 | 3-3/4 | 2-1/2 | 1-3/4 | 3 | 1-1/2 | 0.203 | 0.276 | 6 | 4-1/8 |
| 3 | 3.500 | 3-3/8 | 4-1/2 | 3 | 2 | 3-3/8 | 2 | 0.216 | 0.300 | 6 | 5 |
| 3-1/2 | 4.000 | 3-3/4 | 5-1/4 | 3-1/2 | 2-1/4 | 3-3/4 | 2-1/2 | 0.226 | 0.318 | 6 | 5-1/2 |
| 4 | 4.500 | 4-1/8 | 6 | 4 | 2-1/2 | 4-1/8 | 2-1/2 | 0.237 | 0.337 | 6 | 6-3/16 |
| 12 | 12.750 | 10 | 18 | 12 | 7-1/2 | 10 | 6 | 0.375 | 0.500 | 10 | 15 |
| 5 | 5.563 | 4-7/8 | 7-1/2 | 5 | 3-1/8 | 4-7/8 | 3 | 0.258 | 0.375 | 8 | 7-5/16 |
| 20 | 20.000 | 15 | 30 | 20 | 12-1/2 | 15 | 9 | 0.375 | 0.500 | 12 | 23 |
| 2 | 2.375 | 2-1/2 | 3 | 2 | 1-3/8 | 2-1/2 | 1-1/2 | 0.154 | 0.218 | 6 | 3-5/8 |
| 6 | 6.625 | 5-5/8 | 9 | 6 | 3-3/4 | 5-5/8 | 3-1/2 | 0.280 | 0.432 | 8 | 8-1/2 |
| 1/2 | 0.840 | - | 1-1/2 | - | 5/8 | 1 | 1 | 0.109 | 0.147 | 3 | 1-3/8 |
| 1 | 1.315 | - | 1-1/2 | 1 | 7/8 | 1-1/2 | 1-1/2 | 0.133 | 0.179 | 4 | 2 |
| 10 | 10.750 | 8-1/2 | 15 | 10 | 6-1/4 | 8-1/2 | 5 | 0.365 | 0.500 | 10 | 12-3/4 |
| 24 | 24.000 | 17 | 36 | 24 | 15 | 17 | 10-1/2 | 0.375 | 0.500 | 12 | 27-1/4 |
| 14 | 14.000 | 11 | 21 | 14 | 8-3/4 | 11 | 6-1/2 | 0.375 | 0.500 | 12 | 16-1/4 |
| 1-1/2 | 1.900 | 2-1/4 | 2-1/4 | 1-1/2 | 1-1/8 | 2-1/4 | 1-1/2 | 0.145 | 0.200 | 4 | 2-7/8 |
| 18 | 18.000 | 13-1/2 | 27 | 18 | 11-1/4 | 13-1/2 | 8 | 0.375 | 0.500 | 12 | 21 |
| 8 | 8.625 | 7 | 12 | 8 | 5 | 7 | 4 | 0.322 | 0.500 | 8 | 10-5/8 |
| 16 | 16.000 | 12 | 24 | 16 | 10 | 12 | 7 | 0.375 | 0.500 | 12 | 18-1/2 |
Equivalent Length of SS Fittings (Le/D)
| Fitting | (L/D)eq | Types / Notes |
|---|---|---|
| (180° Bend) | 50 | Threaded, close-return (R/D = 1) |
| (180° Bend) | — | Flanged (R/D = 1) |
| (180° Bend) | — | All types (R/D = 1.5) |
| Threaded (45° Elbow) | 16 | Standard Radius (R/D = 1) |
| Threaded (45° Elbow) | — | LR (R/D = 1.5) |
| Threaded (90° Elbow) | 30 | Standard Radius (R/D = 1) |
| Threaded (90° Elbow) | 16 | LR (R/D = 1.5) |
| (90° Elbow) | 60 | 1 weld (90°) |
| (90° Elbow) | 15 | 2 welds (45°) |
| (90° Elbow) | 8 | 3 welds (30°) |
| Tee Through-branch as an Elbow | 60 | Threaded (r/D = 1) |
| Tee Through-branch as an Elbow | — | Threaded (r/D = 1.5) |
| Tee Through-branch as an Elbow | 20 | Flanged (r/D = 1) |
| Tee Through-branch as an Elbow | — | Stub-in branch |
| (45° Elbow) | 15 | 1 weld 45° |
| (45° Elbow) | 6 | 2 welds 22.5° |
| Flanged/Welded (90° Elbow) | 20 | Standard Radius (R/D = 1) |
| Flanged/Welded (90° Elbow) | 17 | LR (R/D = 2) |
| Flanged/Welded (90° Elbow) | 14 | LR (R/D = 4) |
| Flanged/Welded (90° Elbow) | 12 | LR (R/D = 6) |
| Tee Run-through | 20 | Threaded (r/D = 1) |
| Tee Run-through | — | Flanged (r/D = 1) |
| Tee Run-through | — | Stub-in branch |
Size Chart of Stainless Steel Reducer
| NPS (Inches) | O.D. (mm) | O.D. (Inches) |
|---|---|---|
| 1 1/2 | 48.3 | 1.900 |
| 5 | 141.3 | 5.563 |
| 2 1/2 | 73.0 | 2.875 |
| 3 | 88.9 | 3.500 |
| 1/2 | 21.3 | 0.840 |
| 6 | 168.3 | 6.625 |
| 12 | 323.9 | 12.750 |
| 2 | 60.3 | 2.375 |
| 3/4 | 26.7 | 1.050 |
| 1 | 33.4 | 1.315 |
| 8 | 219.1 | 8.625 |
| 3 1/2 | 101.6 | 4.000 |
| 10 | 273.1 | 10.750 |
| 1 1/4 | 42.2 | 1.660 |
| 4 | 114.3 | 4.500 |
Note: As a leading Stainless Steel Pipe Fittings Manufacturer in India, Navkar Metal Syndicate supplies fittings 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, and Duplex S31803—covering Threaded, Butt Weld, Socket Weld, and Flanged types.
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