Clamping & Pipe
Stainless Steel Tube Fittings
The wide range of automation and CNC equipment allows for efficient fulfillment of high-volume orders as well as the flexibility to switch production lines to meet small batch customization needs.
Tube Fittings Supplier
Stainless Steel Pipe Fittings Supplier in China
Stainless steel tube fittings is a critical component in a fluid transfer system. Its core function is to act as a critical node for connection, sealing and control.Profab utilizes a graded process control for the surface treatment of stainless steel tube fittings. From degreasing and pickling to mechanical and electrolytic polishing and finally passivation and in-line cleaning. This ensures that the surfaces of these stainless steel tube fittings are free of free iron, burns and residues.
Profab Machine can realize different finishes from matte to mirror as per customer’s requirement. We issue surface roughness (Ra) and specular reflectivity test reports according to specified standards.Profab ss tube fittings meet the stringent requirements of hygiene and corrosion resistance in the food, pharmaceutical and chemical industries.
- Excellent corrosion resistance
- Reliability and long life reduce long-term costs
- Less brittle
- Easier maintenance and servicing
Material Specification
Choosing the Right Grade
304 Stainless
Standard grade for indoor machinery, automation, and dry or mildly humid environments. Good resistance to cleaning chemicals. Cost-effective for high-volume orders. Not suitable for continuous salt spray or chloride-heavy process environments.
Food · Automation · Indoor
316 / 316L
Marine and food-grade standard. 2–3% molybdenum addition raises chloride pitting resistance significantly above 304. Required for outdoor, marine, offshore, and food equipment with CIP chemical cleaning. Especially 316 stainless steel has excellent resistance to corrosive saltwater effects.
Marine · Chemical · Pumps
17-4PH
Precipitation-hardened martensitic grade. ≥ 1,310 MPa tensile strength in H900 condition — significantly stronger than 316 at equivalent cross-section. Specified for ball joints in motorsport, aerospace, and high-cycle fatigue applications where load ratings are the primary constraint.
Aerospace · Motorsport · Hi-load
Applications
Where Stainless Steel Tube Fittings Are Used
Stainless steel pipe fittings play an integral role in several key industries due to their superior performance. Profab ss tube fittings support prototype evaluation, process validation, and small lot scale-up production. We also support customized packaging and labeling, and Profab Machine guarantees consistent appearance and performance when delivered at scale, reducing your inspection costs and project risk.
01
Pharmaceuticals & Biotechnology
The pharmaceutical and biotech industries demand the highest fluid purity and traceability. Profab 316L ss tube fittings often undergo electropolishing. This process achieves extremely smooth internal surfaces.
02
Food & Beverage
03
Chemical & Petrochemical
Chemical and petrochemical plant pipelines carry many corrosive fluids. The excellent corrosion resistance of 316L ss tube fittings is crucial.
04
Oil & Gas
Oil and gas pipelines face high pressure, strong vibration, and corrosive fluids. 316/316L pipe fittings are vital in these conditions. They provide excellent sealing, corrosion resistance, and vibration tolerance.
Why Profab
Precision Machined to Your Exact Specification
Direct-from-Manufacturer Advantage
We are the original manufacturer—eliminate all unnecessary middlemen. That means you get the most competitive prices in the market. Enjoy maximum profit margins while ensuring consistent, high-quality stainless steel parts tailored for your business.
Engineering Support and Fast Sampling
We work closely with your technical team to understand and respond to your unique part needs. Whether it’s a CAD file, material conversion or specific tolerances, we can quickly provide samples and provide expert feedback to accelerate your product development.
Volume Discounts for Scalable Business
The more you order, the more you save. We offer tiered pricing for bulk orders, helping you stay competitive as you scale your business. Enjoy more flexible terms for long-term partnerships.
Technical Reference
Technology Comparison
| Tie rod diameter (inches/mm) | Material grade | Allowable tensile load capacity (lb/kN) | Coarse thread root area (square inches) |
|---|---|---|---|
| 1/4″ | 304 SS | 240 pounds | 0.027 |
| 3/8″ | 304 SS | 610 pounds | 0.068 |
| 1/2″ | 304 SS | 1130 pounds | 0.126 |
| 5/8″ | 304 SS | 1810 pounds | 0.202 |
| 3/4″ | 304 SS | 2710 pounds | 0.302 |
| 7/8″ | 304 SS | 3770 pounds | 0.419 |
| 1″ | 304 SS | 4960 pounds | 0.552 |
| 1-1/4″ | 304 SS | 8,000 pounds | 0.889 |
MAWP
Maximum Allowable Working Pressure (MAWP) is the highest internal pressure that a fitting can safely withstand at a given temperature.
The following tables, based on the ASME B31.3 and B31.1 codes, provide the maximum allowable working pressures for different sizes of ss pipe fittings at room temperature (22∘C).
| Size (OD) | Wall Thickness (inches) | Normal Working Pressure（psig） | 537°C（1000°F）Temperature Coefficient | High Temperature Working Pressure（psig） |
|---|---|---|---|---|
| 1/4″ | 0.035 | 4400 | 0.76 | 3344 |
| 1/2″ | 0.035 | 2600 | 0.76 | 1976 |
| 1/2″ | 0.049 | 3700 | 0.76 | 2812 |
| 3/4″ | 0.049 | 2400 | 0.76 | 1824 |
| 1″ | 0.049 | 1800 | 0.76 | 1368 |
Derating
There is a negative correlation between working pressure and temperature. As the temperature increases, the mechanical strength of the stainless steel material gradually decreases, which leads to a weakening of its pressure-bearing capacity. Therefore, the MAWP at room temperature must be depressurized to ensure safety in high-temperature environments.
The user is required to multiply the MAWP at room temperature by the corresponding depressurization factor to obtain the true maximum working pressure at a given high temperature. For example, a 316 stainless steel fitting with a working pressure of 2600 psig at ambient temperature and a temperature coefficient of 0.76 at 537∘C would reduce the MAWP to 1976 psig.
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