Description
Stainless Steel Machined Hydraulic Fittings – SS 316 & SS 304 CNC Hydraulic Connectors
Price: US$ 11.50 / kg | Ex-Works India | MOQ: 50 kg | Lead Time: 15–25 working days
Stainless Steel Fittings India manufactures precision CNC machined stainless steel hydraulic fittings in SS 316, SS 316L, SS 304, and SS 304L grades for hydraulic systems operating at pressures up to 700 bar (10,000 psi). Our stainless steel hydraulic fittings range includes hydraulic tube connectors, hydraulic adapters, BSP hydraulic fittings, NPT hydraulic fittings, JIC 37° flare fittings, ORFS (O-Ring Face Seal) fittings, BSPT hydraulic connectors, metric hydraulic bite-type tube fittings, and custom machined hydraulic manifold blocks. These components are manufactured to ISO 8434, DIN 2353, SAE J514, SAE J1453, and BS 5200 standards and are supplied to electrical OEMs, EPC contractors, power utilities, hydraulic system integrators, and industrial distributors worldwide.
Detailed Product Overview
BSP (British Standard Pipe) Stainless Steel Hydraulic Fittings
BSP stainless steel hydraulic fittings include BSPP (parallel — G-thread) and BSPT (tapered) configurations in SS 316 and SS 316L. Available configurations: straight adaptors, elbows (90° and 45°), tee pieces, reducers, bulkhead adaptors, and blanking plugs. Pressure ratings to 700 bar for straight BSP adaptors in SS 316. Thread sizes from G1/8″ to G2″ parallel and R1/8″ to R2″ taper. Related terms: stainless steel BSP hydraulic fitting, SS 316 BSPP adaptor, hydraulic BSP connector stainless, BSPT SS fitting, G-thread hydraulic SS.
NPT and NPTF Stainless Steel Hydraulic Fittings
NPT (National Pipe Taper) and NPTF (National Pipe Taper Fuel) stainless steel hydraulic fittings in SS 316 and SS 304 are manufactured to ANSI/ASME B1.20.1 and B1.20.3 respectively. These tapered thread fittings provide leak-free seal by thread engagement without additional O-ring. Sizes from 1/16″ NPT to 2″ NPT are available in straight adaptor, elbow, tee, cross, union, and cap configurations. Related terms: stainless steel NPT hydraulic fitting, NPTF SS connector, NPT SS 316 adaptor, hydraulic NPT fitting stainless, American pipe thread hydraulic SS.
JIC 37° Flare Stainless Steel Hydraulic Fittings
JIC (Joint Industry Council) 37° flare stainless steel hydraulic fittings conform to SAE J514 / ISO 8434-2 standards. The 37° flare seat provides a metal-to-metal seal rated to 345 bar (5,000 psi) in SS 316. JIC fittings include JIC male stubs, JIC female swivel nuts, JIC adaptor nipples, JIC tee adaptors, JIC elbows, and JIC union couplings. Thread sizes from -4 (7/16-20 UNF) to -32 (1-7/8-12 UN). Related terms: JIC 37 degree flare SS, SAE J514 stainless hydraulic fitting, 37° flare hydraulic connector SS316, JIC male stainless adaptor, swivel JIC fitting stainless.
ORFS (O-Ring Face Seal) Stainless Steel Hydraulic Fittings
ORFS stainless steel hydraulic fittings to SAE J1453 / ISO 8434-3 provide the highest leak integrity in hydraulic circuits by sealing on an O-ring captured in a face-machined groove. ORFS fittings in SS 316L are rated to 420 bar (6,000 psi) and are preferred for servo-hydraulic systems, test rigs, offshore hydraulics, and high-pressure process pipework. Available in straight adaptor, elbow, tee, and cross configurations. Related terms: ORFS SS 316 fitting, O-ring face seal stainless hydraulic, SAE J1453 stainless connector, ORFS adaptor SS316L, face seal hydraulic fitting SS.
Metric Bite-Type (DIN 2353) Stainless Steel Hydraulic Tube Fittings
Metric stainless steel hydraulic tube fittings to DIN 2353 / ISO 8434-1 use a single-bite or double-bite ferrule (cutting ring) to grip stainless steel tube without brazing or flaring. Available in SS 316 body with SS 316 cutting ring and nut. Sizes from 4 mm OD to 42 mm OD tube; pressure ratings from 400 bar (4 mm) to 160 bar (42 mm). Configurations: straight connector, bulkhead connector, elbow, tee, cross, reducer, and union. Related terms: DIN 2353 stainless hydraulic fitting, metric bite fitting SS316, compression tube fitting stainless hydraulic, cutting ring fitting SS, ISO 8434-1 stainless tube connector.
Stainless Steel Hydraulic Adapters and Cross-Port Connectors
Hydraulic adapter fittings in SS 316 allow connection between different thread standards: BSP-to-NPT, JIC-to-BSP, ORFS-to-BSP, metric-to-BSP, NPT-to-JIC, and custom combinations. These adapters are CNC machined from SS 316 bar, heat-coded, and pressure-tested. Male-to-male, male-to-female, and reducer adapter configurations available in all standard thread pairings. Related terms: SS 316 hydraulic adaptor, BSP to NPT stainless adaptor, cross-port hydraulic connector SS, hydraulic thread converter stainless, dual-standard hydraulic adaptor SS316.
Stainless Steel Hydraulic Manifold Blocks and Sub-Base Manifolds
Custom machined stainless steel hydraulic manifold blocks in SS 316L allow multi-directional fluid routing in a single machined block, eliminating multiple fittings and potential leak paths. Manifold blocks feature cross-drilled passages, ported faces, threaded ports (BSP, NPT, ORFS), and mounting bolt patterns. Operating pressure to 350 bar. Applications include hydraulic power unit (HPU) sub-plates, valve manifolds, test rig pressure distribution blocks, and offshore hydraulic panel assemblies. Related terms: SS hydraulic manifold block, stainless steel sub-base manifold, CNC machined hydraulic block SS316L, multi-port hydraulic manifold stainless, custom hydraulic block SS.
High-Pressure Stainless Steel Hydraulic Fittings (700 bar / 10,000 psi)
For extreme-pressure hydraulic applications up to 700 bar (10,000 psi), we manufacture heavy-duty stainless steel hydraulic fittings with increased wall thickness, longer thread engagement, and precision machined sealing faces. These high-pressure SS 316 fittings are used in hydraulic intensifiers, press systems, hydrostatic test equipment, subsea hydraulic control lines, and chemical injection systems. Body wall thickness and port geometry are calculated to ASME Section VIII Div. 1 pressure vessel design formulae. Related terms: high pressure stainless hydraulic fitting, 700 bar SS fitting, 10000 psi stainless hydraulic connector, heavy duty hydraulic SS 316, extreme pressure hydraulic fitting stainless.
Key Features of Our Stainless Steel Hydraulic Fittings
- Pressure rating up to 700 bar (10,000 psi) in SS 316 heavy-duty configurations
- Thread standards: BSP, BSPT, NPT, NPTF, JIC (SAE J514), ORFS (SAE J1453), DIN 2353, Metric
- Leak-tested: hydraulic pressure test to 1.5× rated pressure per ISO 8434
- Material: SS 316, SS 316L, SS 304, SS 304L with EN 10204 3.1 MTC
- Price: US$ 11.50 / kg ex-works India
- CNC machined — no casting porosity, full mechanical property in bar material
- Passivation per ASTM A967 standard on all fittings
- Full dimensional inspection; thread gauged with certified plug/ring gauges
CNC Machining vs. Casting for Hydraulic Fittings
CNC machined stainless steel hydraulic fittings from solid bar stock have superior mechanical properties, zero casting porosity, and tight dimensional control compared to investment-cast equivalents. For high-pressure applications above 200 bar, machined SS 316 fittings are preferred by hydraulic engineers. Our machined fittings consistently achieve hydrostatic burst pressures 4× the rated working pressure, satisfying the safety factor requirement of ISO 8434 and BS EN 853.
Thread Quality and Leak-Free Performance
All hydraulic fittings are threaded on CNC lathes with thread-whirling or single-point turning to ISO 228 (BSP parallel), ISO 7 (BSP taper), ANSI B1.20.1 (NPT), SAE J514 (JIC), and SAE J1453 (ORFS) standards. Threads are gauged 100% with certified ring and plug gauges. O-ring groove dimensions for ORFS fittings are maintained to ±0.02 mm to ensure O-ring compression in the 15–25% range for leak-free performance.
Corrosion Resistance in Hydraulic Environments
Hydraulic fluids, synthetic esters, phosphate esters, and water-glycol fluids are generally compatible with SS 316 hydraulic fittings. SS 316 provides excellent resistance to hydraulic fluid oxidation by-products, moisture contamination, and chloride contamination in coastal or offshore hydraulic systems. Seawater-compatible hydraulic fittings in SS 316L with EPDM or Viton O-rings are available for offshore and marine hydraulic circuits.
O-Ring and Seal Compatibility
Stainless steel ORFS and O-ring port (SAE 4-bolt flange style) fittings are supplied with NBR (Nitrile) O-rings as standard. Optional seal materials include: Viton (FKM) for mineral oil, phosphate ester, and high-temperature (up to 200°C) service; EPDM for water-glycol, steam, and food-grade hydraulic fluids; PTFE bonded seals for BSPT and NPT dry-seal applications. Seal material specified at order stage.
Custom Hydraulic Fittings to Customer Drawing
Non-standard stainless steel hydraulic fittings are manufactured to customer-supplied drawings, including special port configurations, combined seal types, custom overall lengths, non-standard port spacing, and special surface coatings. CAD-to-part lead time is 15–20 working days. DFM (Design for Manufacturability) review included at quotation stage. Prototype samples available in 7–10 working days.
Hydraulic Fitting Standards Comparison
| Standard | Thread/Connection Type | Seal Method | Max. Pressure (typical) |
|---|---|---|---|
| ISO 8434-1 / DIN 2353 | Metric bite-type | Ferrule (cutting ring) | 400–630 bar |
| ISO 8434-2 / SAE J514 | JIC 37° flare | Metal-to-metal flare | 345 bar |
| ISO 8434-3 / SAE J1453 | ORFS | O-ring face seal | 420 bar |
| ISO 228 / BS 2779 | BSPP (G-thread) | Face washer / O-ring | 315 bar |
| ISO 7 / BS 21 | BSPT (R-thread) | Taper thread engagement | 315 bar |
| ANSI B1.20.1 | NPT | Taper thread + sealant | 210 bar |
Technical Specifications
| Parameter | Specification |
|---|---|
| Material Grades | SS 316, SS 316L, SS 304, SS 304L, SS 321 |
| Thread Standards | BSP (ISO 228 / ISO 7), NPT (ANSI B1.20.1), JIC (SAE J514), ORFS (SAE J1453), DIN 2353, Metric |
| Size Range | 1/8″ to 2″ (BSP/NPT); -4 to -32 (JIC); 4 mm to 42 mm OD (metric bite) |
| Pressure Rating | Up to 700 bar (10,000 psi) – grade and size dependent |
| Operating Temperature | -50°C to +300°C (SS 316); -196°C to +400°C (SS 321) |
| Surface Finish (sealing face) | Ra ≤ 1.6 μm (standard); Ra ≤ 0.8 μm (ORFS face) |
| Surface Treatment | Passivation per ASTM A967 standard |
| Test Standard | Hydrostatic pressure test at 1.5× WP per ISO 8434 |
| MTC Standard | EN 10204 3.1 / 3.2 |
| Price | US$ 11.50 / kg (ex-works India) |
| Lead Time | 15–25 working days standard |
Raw Material Grades and International Equivalents
| Common Name | UNS No. | EN / DIN | BS | ASTM | JIS |
|---|---|---|---|---|---|
| SS 316 | S31600 | 1.4401 | 316 S31 | A276 / A479 | SUS316 |
| SS 316L | S31603 | 1.4404 | 316 S11 | A276 / A479 | SUS316L |
| SS 304 | S30400 | 1.4301 | 304 S31 | A276 / A479 | SUS304 |
| SS 304L | S30403 | 1.4307 | 304 S11 | A276 / A479 | SUS304L |
| SS 321 | S32100 | 1.4541 | 321 S31 | A276 / A479 | SUS321 |
| SS 316Ti | S31635 | 1.4571 | 320 S31 | A276 | SUS316Ti |
Product Types / Variants
| Product Variant | Standard | Pressure Rating | Typical Grade |
|---|---|---|---|
| BSP Straight Adaptor | ISO 228 | Up to 700 bar | SS 316 |
| BSP Elbow (90°) | ISO 228 | Up to 500 bar | SS 316 |
| NPT Male/Female Adaptor | ANSI B1.20.1 | Up to 420 bar | SS 316, SS 304 |
| JIC 37° Flare Adaptor | SAE J514 | Up to 345 bar | SS 316 |
| ORFS Adaptor | SAE J1453 | Up to 420 bar | SS 316L |
| Metric Bite-Type Connector | DIN 2353 / ISO 8434-1 | Up to 630 bar | SS 316 |
| Hydraulic Manifold Block | Custom / DIN | Up to 350 bar | SS 316L |
| Hydraulic Bulkhead Fitting | ISO 228 / SAE J514 | Up to 315 bar | SS 316 |
| Swivel Hydraulic Coupling | JIC / ORFS | Up to 280 bar | SS 316 |
Applications by Industry
| Industry | Application of SS Hydraulic Fittings |
|---|---|
| Power Utilities | Hydraulic turbine governor lines, generator lube oil systems, transformer cooling circuit connectors |
| Electrical OEMs | Hydraulic actuator connections on high-voltage switchgear, hydraulic brake systems for motors |
| EPC Contractors | Hydraulic piping systems for process plants, power station hydraulic panels, skid-mounted HPUs |
| Oil & Gas | Subsea hydraulic control umbilicals, wellhead chemical injection, hydraulic BOP connections |
| Chemical Process | Corrosion-resistant hydraulic lines in chloride environments, process fluid injection systems |
| Marine / Offshore | Deck machinery hydraulics, crane hydraulic systems, anchor winch connections |
| Industrial Machinery | Press hydraulics, moulding machine connections, CNC machine tool hydraulic lines |
Manufacturing Process
1. Bar Material Procurement: SS 316 / SS 316L bar sourced with EN 10204 3.1 MTC; chemical composition and mechanical property verified.
2. Sawing: Bar cut to length on CNC circular saws with carbide-tipped blades; cut face deburred.
3. CNC Turning — Body Profile: Outer diameter, shoulder faces, hex flats, and undercuts machined on CNC lathes (Mazak, Okuma, or equivalent) with live tooling.
4. Thread Machining: Internal and external threads single-point turned to specified standard; thread lead, form, and pitch verified with calibrated gauges.
5. Sealing Face Machining: ORFS face groove or JIC flare seat machined to Ra ≤ 0.8 μm; dimensional accuracy ±0.02 mm.
6. Cross-Drilling (Elbow/Tee): Transverse ports drilled and reamed on CNC machining centres; passage intersections deburred with endoscopic camera verification.
7. Deburring and Cleaning: Vibratory deburring; ultrasonic cleaning; internal passage flushing with hot DI water.
8. Passivation: Citric acid passivation per ASTM A967; rinsing and drying.
9. Pressure Testing: Hydrostatic test at 1.5× working pressure; pneumatic seal test at 5 bar with leak detection fluid.
10. Thread Gauging and Final Inspection: 100% thread gauging; CMM dimensional check on sample; hardness verification.
11. Marking and Packing: Electrochemical or laser marking of size, grade, and heat code; caps/plugs fitted; VCI packing; export labelling.
Quality Standards and Certifications
| Standard | Scope |
|---|---|
| ISO 9001:2015 | Quality Management System |
| ISO 8434-1 / DIN 2353 | Metric hydraulic tube fittings |
| ISO 8434-2 / SAE J514 | JIC 37° flare fittings |
| ISO 8434-3 / SAE J1453 | ORFS fittings |
| ISO 228 / ISO 7 | BSP thread standards |
| ANSI B1.20.1 / B1.20.3 | NPT / NPTF threads |
| ASTM A276 / A479 | Raw material specification |
| ASTM A967 | Passivation specification |
| EN 10204 3.1 / 3.2 | Material Test Certificates |
| RoHS / REACH | Environmental compliance |
Why Choose Stainless Steel Fittings India for Hydraulic Fittings?
- Complete CNC machined range from 1/8″ BSP to 2″ BSP / NPT, JIC, ORFS, DIN 2353 in SS 316
- In-house hydrostatic pressure testing at 1.5× WP on every batch
- 100% thread gauging with certified gauges on all fittings
- Competitive price: US$ 11.50 / kg — no casting, no porosity risk
- EN 10204 3.1 MTC on all fittings; 3.2 inspection available on request
- Custom hydraulic fittings to drawing in 15–25 working days
- Global supply: USA, UK, UAE, Germany, Singapore, Australia, Netherlands, Saudi Arabia
- Proven supply track record with EPC contractors, power utilities, and OEM assemblers
Frequently Asked Questions
Q1: What is the maximum pressure rating for your stainless steel hydraulic fittings?
Our SS 316 hydraulic fittings are rated up to 700 bar (10,000 psi) for heavy-duty straight adaptors. Pressure rating depends on fitting type, thread size, and wall thickness. Elbow and tee fittings are typically rated 70–80% of the straight adaptor rating. All ratings are per ISO 8434 safety factor requirements.
Q2: What is the difference between BSP and NPT hydraulic fittings?
BSP (British Standard Pipe) uses a 55° thread angle, while NPT (National Pipe Taper) uses a 60° thread angle. BSP parallel (BSPP / G-thread) seals on a face seal or bonded washer; BSP taper (BSPT / R-thread) and NPT seal by taper thread engagement with PTFE tape or anaerobic sealant. The two standards are NOT interchangeable. We manufacture both in SS 316.
Q3: Can you supply stainless steel ORFS fittings to SAE J1453?
Yes. We manufacture ORFS (O-Ring Face Seal) fittings in SS 316L to SAE J1453 / ISO 8434-3 with Viton (FKM), NBR, or EPDM O-rings. ORFS fittings provide the highest leak integrity of all hydraulic fitting types and are preferred for servo-hydraulic and precision pressure systems.
Q4: Are your stainless steel hydraulic fittings suitable for subsea applications?
Yes. SS 316L hydraulic fittings with ORFS sealing and Viton O-rings are used in subsea hydraulic control lines, chemical injection systems, and offshore deck machinery. SS 316L’s molybdenum content (2–3%) provides resistance to seawater chloride pitting. Special coatings (Xylan, PTFE) are available for additional galvanic protection.
Q5: Do you supply DIN 2353 metric bite-type fittings in stainless steel?
Yes. We manufacture DIN 2353 / ISO 8434-1 metric stainless steel tube fittings (bite-type, compression ring) from 4 mm OD to 42 mm OD tube in SS 316 body, nut, and cutting ring. Pressure ratings reach 630 bar for small tube sizes. These are widely used in European and Asian hydraulic systems.
Q6: What hydraulic fluids are compatible with SS 316 hydraulic fittings?
SS 316 hydraulic fittings are compatible with: mineral-based hydraulic oil (ISO VG 32–68), synthetic esters, phosphate esters (e.g., Skydrol), water-glycol fluids, high water-base fluids (HWBF), and biodegradable hydraulic fluids. Compatibility of O-ring materials (NBR, Viton, EPDM) with the specific fluid should be verified separately.
Q7: Can you supply stainless steel hydraulic manifold blocks?
Yes. We manufacture custom CNC machined SS 316L hydraulic manifold blocks with BSP, NPT, ORFS, or JIC ports, cross-drilled passages, and mounting holes. Manifold blocks eliminate multiple external fittings and associated leak points. Proof pressure testing and particle cleanliness testing to ISO 23309 are available.
Q8: What is the lead time for stainless steel hydraulic fittings?
Standard catalogue sizes: 15–25 working days. Custom fittings to drawing: 20–30 working days. Urgent orders (standard sizes): 7–10 working days subject to schedule. Air freight available globally for urgent project deliveries.
Q9: Do you supply stainless steel hydraulic fittings with third-party inspection?
Yes. Third-party inspection by Bureau Veritas, SGS, Intertek, LRQA, or customer-nominated inspectors is available. Witnessed hydrostatic testing, dimensional inspection, and MTC verification (EN 10204 3.2) can be arranged at additional cost.
Q10: What is the price of stainless steel hydraulic fittings?
Our stainless steel hydraulic fittings are priced at US$ 11.50 per kg ex-works India for standard configurations. Custom fittings, special surface treatments, and small batches may attract a surcharge. Volume discounts available for orders above 500 kg. Contact our team for a detailed quotation with dimensional drawings.
Equivalent Terms in Other Languages
| Language | Terms |
|---|---|
| Spanish | Racores hidráulicos de acero inoxidable, Conectores hidráulicos SS 316, Adaptadores hidráulicos inox |
| Russian | Гидравлические фитинги из нержавеющей стали, Штуцеры гидравлические СС316, Гидравлические соединители нержавейка |
| French | Raccords hydrauliques inox, Raccords hydrauliques SS 316, Connecteurs hydrauliques acier inoxydable |
| Portuguese | Conexões hidráulicas de aço inoxidável, Adaptadores hidráulicos SS 316, Encaixes hidráulicos inox |
| Italian | Raccordi idraulici in acciaio inossidabile, Connettori idraulici SS 316, Adattatori idraulici inox |
Related Products (Internal Links)
- Stainless Steel Machined Parts & Turned Components
- Stainless Steel Milling – SS 316 & 304 Milled Parts
- Stainless Steel Swiss Machining
- SS 316 CNC Machining
- Stainless Steel 37° Flare Tube Fittings
Request a Quote
Contact Stainless Steel Fittings India for stainless steel machined hydraulic fittings in SS 316, SS 316L, and SS 304. Send thread standard, size, pressure rating, and quantity for a detailed quotation within 24 hours. Price: US$ 11.50 / kg — bulk pricing available above 500 kg. Custom hydraulic fittings to drawing manufactured on request.
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