316 stainless steel threaded pipe fittings are corrosion-resistant components used to connect, control, and direct fluid flow in piping systems. These fittings are commonly used in industries requiring high resistance to chemicals, saltwater, and extreme temperatures.
Threaded pipe fittings are components used to connect, control, or change the direction of fluid flow in a piping system using screw threads. They provide a secure, leak-resistant connection without welding, making them easy to install and remove.
Stainless Steel Threaded Pipe Fittings Near Me
Easy Installation & Maintenance – Can be assembled and disassembled without welding, ideal for temporary or frequently modified systems.
Leak-Resistant Design – Tapered threads (e.g., NPT, BSPT) create a tight seal to prevent leakage.
Durable & Versatile – Available in various materials for different pressure and temperature conditions.
Wide Range of Applications – Used in water, gas, steam, oil, chemical, and industrial piping systems.
Why is 316 stainless steel so expensive?
1. Higher Nickel Content
316 stainless steel contains more nickel (10-14%) compared to 304 (8-10.5%).
Nickel is a valuable metal, and its price fluctuates based on global supply and demand.
More nickel enhances corrosion resistance and durability but increases cost.
2. Addition of Molybdenum (2-3%)
Molybdenum (Mo) is the main cost-driving element in 316 stainless steel.
Molybdenum significantly improves resistance to chlorides, acids, and harsh environments.
This makes 316 ideal for marine, chemical, and medical applications, but molybdenum is an expensive alloying element.
3. More Complex Manufacturing Process
316 stainless steel requires more precise alloying and refining to achieve its superior corrosion resistance and mechanical properties.
The presence of molybdenum makes melting, processing, and machining more difficult, increasing production costs.
Special heat treatments are needed to maintain structural integrity.
4. Higher Durability & Longevity
316 lasts longer than 304 in extreme conditions, reducing maintenance and replacement costs.
It is commonly used in marine, chemical, and industrial environments where failure could be catastrophic.
The long-term benefits justify the higher upfront cost.
What is ASTM standard stainless steel fittings?
ASTM Standards for Stainless Steel Pipe Fittings
The ASTM (American Society for Testing and Materials) establishes standards for materials, testing, and manufacturing processes to ensure quality, durability, and safety in stainless steel fittings.
1. Common ASTM Standards for Stainless Steel Pipe Fittings
| ASTM Standard | Description | Common Grades | Application |
| ASTM A403 | Wrought Stainless Steel Pipe Fittings | 304, 316, 304L, 316L | Elbows, Tees, Reducers, Caps, etc. |
| ASTM A182 | Forged or Rolled Stainless Steel Pipe Fittings, Flanges, Valves | 304, 316, 321, 347, Duplex | High-pressure fittings & flanges |
| ASTM A351 | Cast Stainless Steel Fittings & Valves | CF8 (304), CF8M (316) | Corrosive & high-temperature environments |
| ASTM A312 | Seamless & Welded Stainless Steel Pipes | 304, 316, 321, 347 | Used for manufacturing pipe fittings |
| ASTM A269 | Seamless & Welded Stainless Steel Tubing | 304, 316, 321 | Instrumentation, hydraulic & heat exchanger tubing |
| ASTM A479 | Stainless Steel Bars & Shapes | 304, 316, 410, 630 | Raw material for machined fittings |
2. Types of Stainless Steel Fittings Covered Under ASTM Standards
Butt Weld Fittings (ASTM A403) – Used for permanent welded connections.
Forged Fittings (ASTM A182) – Includes socket weld & threaded fittings for high-pressure applications.
Cast Fittings (ASTM A351) – Made using casting methods for corrosion-resistant environments.
Seamless & Welded Pipe Fittings (ASTM A312, A269) – Used in piping systems requiring high strength and corrosion resistance.
316 Stainless Steel Threaded Pipe Fittings Specification
Size: 1/8″ to 4″ / DN6 to DN100
Pressure: 3000 LB, 6000 LB, 9000 LB
Stainless Steel: ASTM A182 F304, F316, F317, F321, F310
Duplex Stainless Steel: ASTM A182 F51, F53, F55
Product: 90 Degree Elbow, 45 Degree Elbow, Coupling, Tee, Union, Cross, Cap.
ASME SA182 F316 Forged Threaded Fittings Chemical Composition
ASTM A182 SS 316 Forged Steel Fittings Mechanical Properties
| Grade | Tensile Strength | Melting Point | Yield Strength (0.2%Offset) | Density | Elongation |
| SS 316 | Psi – 75000 , MPa – 515 | 1400 °C (2550 °F) | Psi – 30000 , MPa – 205 | 8.0 g/cm3 | 35% |
| SS 316L | Psi – 75000 , MPa – 515 | 1399 °C (2550 °F) | Psi – 30000 , MPa – 205 | 8.0 g/cm3 | 35% |
| SS 316H | Psi – 75000 , MPa – 515 | 1400 °C (2550 °F) | Psi – 30000 , MPa – 205 | 8.0 g/cm3 | 35% |
| SS 316Ti | Psi – 75000 , MPa – 515 | 1399 °C (2550 °F) | Psi – 30000 , MPa – 205 | 8.0 g/cm3 | 35% |
What is the difference between 304 and 316 stainless steel fittings?
Corrosion Resistance
304 Stainless Steel:
Good corrosion resistance but less resistant to chlorides and acidic environments.
Suitable for indoor and mild outdoor environments.
316 Stainless Steel:
Superior corrosion resistance, especially against saltwater, chemicals, and acids.
Ideal for marine, chemical, and pharmaceutical applications.
Strength & Durability
Both 304 and 316 have similar mechanical strength, but 316 is slightly stronger due to its higher nickel content and molybdenum addition.
| Property | 304 Stainless Steel | 316 Stainless Steel |
| Tensile Strength | 515 MPa | 515 MPa |
| Yield Strength | 205 MPa | 205 MPa |
| Hardness (Brinell) | 201 HB | 217 HB |
316 is slightly harder and more resistant to wear and tear, making it ideal for extreme environments.
Cost Comparison
316 Stainless Steel is more expensive than 304 due to its molybdenum and higher nickel content.
304 is a cost-effective choice for general-purpose applications.
Which One Should You Choose?
Choose 304 if:
✅ Cost is a major factor.
✅ Application is in mild environments (indoor, food-grade, general plumbing).
✅ Exposure to chlorides, saltwater, or chemicals is minimal.
Choose 316 if:
✅ Application involves saltwater, harsh chemicals, or extreme temperatures.
✅ Used in marine, pharmaceutical, chemical, or industrial settings.
✅ Long-term durability and superior corrosion resistance are required.
Stainless Steel Pipe Threaded Fittings Pressure Ratings
| Table Il-2-2.2 Pressure-Temperature Ratings for Group 2.2 Materials | |||||||
| Nominal Designation | Forgings | Castings | Plates | ||||
| 16Cr-12Ni-2Mo | A182 Gr.F316(1) | A351 Gr.CF3M(2) | A240 Gr.316(1) | ||||
| Working Pressures by Classes,psig | |||||||
| Class | |||||||
| Temp.,F | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 |
| -20 to 100 | 275 | 720 | 960 | 1440 | 2160 | 3600 | 6000 |
| 200 | 235 | 620 | 825 | 1240 | 1860 | 3095 | 5160 |
| 300 | 215 | 560 | 745 | 1120 | 1680 | 2795 | 4660 |
| 400 | 195 | 515 | 685 | 1.025 | 1540 | 2570 | 4280 |
| 500 | 170 | 480 | 635 | 955 | 1435 | 2390 | 3980 |
| 600 | 140 | 450 | 600 | 900 | 1355 | 2255 | 3760 |
| 650 | 125 | 440 | 590 | 885 | 1325 | 2210 | 3680 |
| 700 | 110 | 435 | 580 | 870 | 1305 | 2170 | 3620 |
| 750 | 95 | 425 | 570 | 855 | 1280 | 2135 | 3560 |
| 800 | 80 | 420 | 565 | 845 | 1265 | 2110 | 3520 |
| 850 | 65 | 420 | 555 | 835 | 1255 | 2090 | 3480 |
| 900 | 50 | 415 | 555 | 830 | 1245 | 2075 | 3460 |
| 950 | 35 | 385 | 515 | 775 | 1160 | 1930 | 3220 |
| 1000 | 20 | 365 | 485 | 725 | 1090 | 1820 | 3030 |
| 1050 | 360 | 480 | 720 | 1080 | 1800 | 3000 | |
| 1100 | 305 | 405 | 610 | 915 | 1525 | 2545 | |
| 1150 | 235 | 315 | 475 | 710 | 1185 | 1970 | |
| 1200 | 185 | 245 | 370 | 555 | 925 | 1545 | |
| 1250 | 145 | 195 | 295 | 440 | 735 | 1230 | |
| 1300 | 115 | 155 | 235 | 350 | 585 | 970 | |
| 1350 | 95 | 130 | 190 | 290 | 480 | 800 | |
| 1400 | 75 | 100 | 150 | 225 | 380 | 630 | |
| 1450 | 60 | 80 | 115 | 175 | 290 | 485 | |
| 1500 | 40 | 55 | 85 | 125 | 205 | 345 | |
Common Types of SS 316 Threaded Fittings
Elbows (90° and 45°) – Used to change pipe direction.
Tees – Allow branching of the pipeline.
Couplings – Connect two pipes together.
Unions – Provide easy disconnection for maintenance.
Bushings – Reduce pipe size.
Nipples – Short sections of threaded pipe.
Caps & Plugs – Seal pipe ends.
Crosses – Four-way connection.
What is threaded vs tapered?
When discussing threaded pipe fittings, the terms threaded and tapered often come up. The main distinction lies in how the threads are cut and how they seal.
1. Threaded Threads (Parallel or Straight Threads)
Definition: The thread diameter remains the same from end to end.
Seal Type: Requires a gasket, O-ring, or thread sealant to prevent leaks.
Common Thread Types:
BSPP (British Standard Pipe Parallel)
UN/UNF (Unified National Fine)
ISO Metric Parallel Threads
Example Use Cases: Hydraulic fittings, mechanical joints, low-pressure applications.
Example: A BSPP (British Standard Pipe Parallel) fitting relies on a washer or O-ring for sealing.
2. Tapered Threads
Definition: The thread diameter gradually decreases along the length of the fitting.
Seal Type: Forms a mechanical seal by wedging the threads together, often with PTFE tape (Teflon) or thread sealant.
Common Thread Types:
NPT (National Pipe Thread, Tapered) – U.S. Standard
BSPT (British Standard Pipe Tapered)
ISO Tapered Threads
Example Use Cases: Plumbing, gas, steam, and high-pressure applications where a tight, leak-resistant connection is required.
Example: A NPT (National Pipe Taper) fitting creates a seal as the threads tighten, making it leak-resistant.
3. Key Differences Between Parallel (Threaded) & Tapered Threads
| Feature | Threaded (Parallel) | Tapered |
| Thread Shape | Constant diameter | Tapers gradually |
| Sealing Method | Requires gasket, O-ring, or sealant | Forms a seal when tightened (may use Teflon tape) |
| Leak Prevention | Needs an additional sealing element | Self-sealing due to wedging effect |
| Common Applications | Hydraulic fittings, mechanical assemblies | Plumbing, gas, steam, high-pressure systems |
| Examples | BSPP, UN/UNF, ISO Metric | NPT, BSPT, ISO Tapered |
4. How to Identify Tapered vs. Parallel Threads
✅ Look at the thread profile: If the diameter changes from one end to the other, it’s tapered.
✅ Check the sealing method: If it requires a washer or O-ring, it’s parallel; if it tightens into a seal, it’s tapered.
✅ Use a thread gauge: This can confirm whether the thread profile is parallel or tapered.
You can get an offer for products in below material forms:
-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)
-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )
-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)
-Round bar , Billet (ASTM A276, ASTM A479)
– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)
-Bolting, Nuts（ASTM A193, A194, A320）
316 stainless steel threaded pipe fitting Exported Countries
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