Stainless Steel 304L Tube fittings – Manufacturer, Supplier & Exporter in India
Precision-engineered double ferrule, compression and instrumentation tube fittings in 1/8ʺ to 2ʺ sizes, rated up to 10,000 PSI — supplied with EN 10204 3.1 mill test certificates and interchangeable with Swagelok®, Parker® and DK-LOK® designs.
- ISO 9001:2015, PED 2014/68/EU & NACE MR0175 / ISO 15156 compliant
- Ready stock in Mumbai — same-day quote, worldwide dispatch
- Leak-proof, vibration-resistant joints for high-pressure service
- Custom sizes, threads and end-connections manufactured on request
What Are Stainless Steel 304L Tube Fittings?
Stainless steel 304L tube fittings are precision tube fittings that can be used to join, branch, seal and redirect a tube run in fluid and gas systems without welding. The “L” refers to the low carbon variants (maximum 0.030% carbon) which are much less likely to precipitate carbides and to undergo intergranular corrosion at weld zones compared to a standard 304. Because the low-carbon chemistry resists carbide precipitation in the weld-affected zone, 304L is specified where joints are welded, thermally cycled, or exposed to mildly corrosive media — common in oil & gas, chemical processing, pharmaceutical and instrumentation systems.
We offer a full range of 304L fitting family single and double ferrule compression fittings, tube unions, elbows, tees, crosses, bulkhead unions, male and female connectors, reducers, caps and plugs in inch and metric sizes from 1/8ʺ (3 mm) to 2ʺ (50 mm). Each fitting is manufactured from ASTM A182 / A276 / A479 bar stock, pressure tested to 10,000 PSI and shipped with complete material traceability. Our 304L fittings provide a positive, repeatable, leak free seal that is reliable against pressure spikes, vibration, as well as when building new instrumentation manifolds or replacing corroded joints on an existing skid. If you have a size, thread and end connection, we can try to match it from stock or we can make it for you.
- What Are Stainless Steel 304L Tube Fittings ?
- Specifications of Stainless Steel 304L Tube Fittings
- Chemical Composition & Mechanical Properties
- Stainless Steel 304L Tube Fittings Equivalent Grades
- Related Types Of Stainless Steel 304L Instrumentation Tube Fittings
- Pressure Rating, Size & Torque Charts
- 304L vs 304 vs 316L Comparison
- Applications & Industries
- Manufacturing, Quality & Testing
- Certifications & Standards
- Our Related Products
Specifications of Stainless Steel 304L Tube Fittings
| Specification | Details |
|---|---|
| Material Grade | 304L Stainless Steel (UNS S30403) |
| Standards | ASTM A182 / A276 / A479; ASME SA182 / SA276 / SA479 |
| Size Range | 1/8ʺ to 2ʺ (3 mm to 50 mm); OD 6 mm to 38 mm |
| Pressure Rating | 1,000 / 3,000 / 6,000 / 10,000 PSI |
| Thread Types | NPT, NPTF, BSPT, BSPP, JIC, UNF, metric |
| Thread Standards | ASME B1.20.1 (NPT), ISO 228/1 (BSPP), ISO 7/1 (BSPT) |
| End Connections | Threaded, Welding, JIC, Tube-to-Tube |
| Ferrule Type | Single ferrule & double (twin) ferrule |
| Hardness | ≤ 80 HRB (typical), ≈ 92 HRB max |
| Surface Finish | Bright annealed, polished, cold drawn |
| Manufacturing | Forged / machined from round bar (A182) or hex bar (A276) |
| Test Certificate | EN 10204 3.1 / 3.2 (MTC), NACE MR0175 / ISO 15156 |
| HS Code | 73079900 |
Chemical Composition & Mechanical Properties
Stainless Steel 304L Tube Fittings Chemical Composition of 304L (UNS S30403) — % by weight
| Element | C | Mn | Si | P | S | Cr | Ni | N |
|---|---|---|---|---|---|---|---|---|
| 304L | 0.030 max | 2.00 max | 0.75 max | 0.045 max | 0.030 max | 18.0–20.0 | 8.0–12.0 | 0.10 max |
Note: 304L’s defining feature is its restricted carbon content (0.030% max vs ~0.08% for standard 304), which preserves corrosion resistance in the weld-affected zone.
Stainless Steel 304L Tube Fittings Mechanical Properties (at room temperature)
| Property | Value |
|---|---|
| Tensile Strength | 485 MPa min (70,000 PSI) |
| Yield Strength (0.2% offset) | 170 MPa min (25,000 PSI) |
| Elongation | 35–40% min |
| Hardness | ≤ 92 HRB / ≈ 201 HB |
| Density | 8.0 g/cm³ |
| Melting Point | ≈ 1,400°C (2,550°F) |
| Max Service Temperature | ≈ 870°C (intermittent) |
Stainless Steel 304L Tube Fittings Equivalent Grades
| Standard | UNS | WNR / DIN | EN | JIS | BS | AFNOR | GOST |
|---|---|---|---|---|---|---|---|
| 304L | S30403 | 1.4306 / 1.4307 | X2CrNi18-9 / 19-11 | SUS 304L | 304S11 | Z3CN18-10 | 03X18H11 |
We Supplied a Comprehensive Range Of 304L Stainless Steel Tube Fittings
Related Types Of Stainless Steel 304L Instrumentation Tube Fittings
SS 304L Union Elbow
SS 304L Bulkhead Elbow
SS 304L Bulkhead Union
SS 304L Reducing Union
SS 304 Male Branch Tee
SS 304 Male Run Tee
SS 304 Male Elbow
SS 304 Bulkhead Male Connector
SS 304 Union Tee
SS 304 Reducing Union Tee
SS 304 Union Cross
SS 304 Male Connector
SS 304 Female Branch Tee
SS 304 Male Adapter
SS 304 Female Adapter
SS 304 Positionable Male Elbow
SS 304 Female Run Tee
SS 304 Female Elbow
SS 304 Bulkhead Female Connector
SS 304 Female Connector
SS 304 Front Ferrule
SS 304 Back Ferrule
SS 304 Tube End Closure
SS 304 Ferrule Nut
Pressure Rating, Size & Torque Charts
Working Pressure by Connection Size (indicative)
| NPT/ISO Size (in.) | Female PSIG (BAR) | Male PSIG (BAR) |
|---|---|---|
| 1/16 | 6,700 (461) | 11,000 (757) |
| 1/8 | 6,500 (447) | 10,000 (689) |
| 1/4 | 6,600 (454) | 8,000 (551) |
| 3/8 | 5,300 (365) | 7,800 (537) |
| 1/2 | 4,900 (337) | 7,700 (530) |
| 3/4 | 4,600 (316) | 7,300 (502) |
| 1 | 4,400 (303) | 5,300 (365) |
| 1-1/4 | 5,000 (344) | 6,000 (413) |
| 1-1/2 | 4,600 (316) | 5,000 (344) |
| 2 | 3,900 (268) | 3,900 (268) |
Values are indicative for room-temperature service; de-rate for elevated temperature. Confirm against the specific fitting datasheet before design.
Tube OD — Imperial to Metric Reference
| Imperial OD | Metric OD | Imperial OD | Metric OD |
|---|---|---|---|
| 1/16ʺ | 2 mm | 1/2ʺ | 12 mm |
| 1/8ʺ | 3 mm | 5/8ʺ | 14/16 mm |
| 3/16ʺ | 4 mm | 3/4ʺ | 15/18 mm |
| 1/4ʺ | 6 mm | 1ʺ | 18/25 mm |
| 5/16ʺ | 8 mm | 1-1/4ʺ | 20 mm |
| 3/8ʺ | 10 mm | 1-1/2ʺ | 22 mm |
Recommended Make-Up Torque — Compression Fittings
| Fitting Thread Size | Torque (lb-ft) | Torque (kgf-cm) |
|---|---|---|
| NPT 1/8, R1/8 | 5 – 6.5 | 70 – 90 |
| NPT 1/4, R1/4 | 8.5 – 10 | 120 – 140 |
| NPT 3/8, R3/8 | 16 – 17.5 | 220 – 240 |
| NPT 1/2, R1/2 | 20 – 21.5 | 280 – 300 |
| M5 – M6 (10-32) | 1.0 – 1.5 | 14 – 21 |
We Keep Bulk Stock Of 304L Stainless Steel Compression Fittings At Our Stockyard, Contact Us For Free Sample & Stock List.
304L vs 304 vs 316L Comparison
| Attribute | 304 | 304L | 316L |
|---|---|---|---|
| Carbon (max) | 0.08% | 0.030% | 0.030% |
| Molybdenum | None | None | 2–3% (added) |
| Weld corrosion resistance | Good | Excellent | Excellent |
| Chloride / pitting resistance | Moderate | Moderate | High |
| Tensile strength (min) | 515 MPa | 485 MPa | 485 MPa |
| Relative cost | Low | Low–Medium | Higher |
| Best for | General, non-welded | Welded, mild media | Marine, chloride, harsh media |
Applications & Industries
304L tube fittings serve any system that demands clean, leak-free, corrosion-resistant connections. Our fittings are field-proven across:
- Oil & Gas — wellhead instrumentation, hydraulic control lines
- Petrochemical & Chemical processing plants
- Pharmaceutical & sanitary process tubing
- Food, beverage & dairy processing
- Power plants & energy generation
- Pulp & paper mills
- Semiconductor & high-purity gas systems
- Subsea exploration & alternative fuels
- Instrumentation, gauge & analyser hook-ups
- Aerospace, automotive & structural assemblies
Manufacturing, Quality & Testing
Every batch is produced under a controlled, documented process and verified before dispatch. Our in-house and NABL-accredited testing covers:
Tests Performed
- Chemical (PMI) & spectro analysis for grade confirmation
- Mechanical: tensile, yield, elongation & hardness testing
- Hydrostatic & pneumatic leak testing
- Intergranular corrosion (IGC) test
- Micro & macro examination, flaring & flattening tests
- Pitting resistance & positive material identification (PMI)
Documentation Supplied
- EN 10204 3.1 / 3.2 mill test certificate (MTC)
- 100% radiography / NDT reports where applicable
- Third-party inspection & NABL lab reports on request
- Commercial invoice, packing list & guarantee letter
Packaging
Fittings are wrapped in anti-tarnish paper and plastic, then packed in bubble wrap and sturdy wooden boxes to prevent corrosion and transit damage during export shipping.
Certifications & Standards
- ISO 9001:2015 Quality Management certified
- PED 2014/68/EU approved manufacturer
- NACE MR0175 / ISO 15156 compliant for sour service
- EN 10204 3.1 / 3.2 material certification
- Manufacturing standards: ASTM A182 / A276 / A479, ASME SA-series
Our Related Products
Frequently Asked Questions About Stainless Steel 304 Tube Fittings
The instrumentation tube fittings SS 304L make leak-tight connections in a process control which are vibration-free and corrosion-free. They are typically used in gas lines, chemical dosing units, hydraulic systems, analyzers and high purity where high precision flow control and mechanical stability are required.
Yes. SS 304L compression and ferrule fittings are designed to operate with moderately high and high pressures with variations in tube sizes, wall thickness and configuration. They have better weldability due to their low-carbon chemistry and minimized chances of carbide precipitation thus they remain stable with changing pressures and thermal excursions.
Although both grades have similar corrosion resistance, the 304L is low in carbon reducing the formation of carbide during the welding process. This causes 304L instrumentation fittings to be the favorite choice when the system operates at increased temperature, is in contact with a harsh chemical or when the welded assembly requires long and continuous service in the system.
These are chosen based on operating pressure, compatibility of the media with the operating pressure, temperature constraints and tube size. Directional changes are done by means of elbows, tees and unions and ferrule fittings are used to have a secure sealing. Always be certain to sub-match the fitting material with the process fluid and to make sure the dimensions and the instrumentation tubing standards conform.
Yes. SS 304L tube fittings are highly resistant to corrosion in the atmosphere, weak chemical exposure and oxidizing atmosphere. They contain chromium-nickel composition and are stable in humid, salty, light industrial applications and are therefore applicable in chemical dosing, instrumentation lines and general-purpose processes.
The capability of pressure depends on fitting design, tube OD and wall thickness. As a rule, SS 304L instrumentation fittings can withstand several thousand PSI pressures when properly installed, even in a medium duty manner. Never use more pressure or unsafe operating temperatures than recommended on manufacturer charts.
Yes. SS 304L fittings are fitting most seamless and welded 304, 304L and 316 stainless-steel tubes. OD, surface finish and hardness of tubes must be checked to provide tight-fitting sealing and negative failures in the long-term during installation and system running.
For More Information About Stainless Steel 304L Instrumentation Fittings please call +91-22-66362223 / 66394926 or send an email to export@aashishmetal.com
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