ASTM A182 F304L Stainless Steel Coupling Full Thread FNPT ASME B16.11 Forged Fittings
ASTM A182 F304L Stainless Steel Thread Full Coupling FNPT ASME B16.11 Forged Fittings
ASTM A182 F304L Stainless Steel Coupling Full Thread FNPT ASME B16.11 Forged Fittings” describes a forged stainless steel pipe coupling made from ASTM A182 F304L low-carbon austenitic stainless steel, with female NPT threads at both ends (FNPT × FNPT), manufactured to the ASME B16.11 standard for forged threaded fittings. It is used to connect two male threaded pipes or fittings in a straight line.
It is not one single standard; it is a product description combining material specification, fitting type, thread type, dimensional standard, and manufacturing method.
Specification
| Type | Thread Full Coupling, Thread Half Coupling, Reducing Coupling |
| Specification | ASTM A182/ASME SA182 F304L |
| Other Pattern | Weldolet, socketolet, threadolet, nipolet, latrolet, elbowolet |
| Size | 1/8" - 4" |
| Class | 3000#, 6000#, 9000# |
| Dimension | ANSI/ASME B16.11, MSS SP 97, MSS SP 83, MSS SP 95, MSS SP 97 |
| Application | Industry, Natural Gas , Petroleum, Gas And Oil Pipes, Chemical |
Notes
FNPT means Female National Pipe Thread (tapered). It is sometimes written as FPT.
Full Thread in trade listings usually means the coupling is threaded at both ends (a full coupling, not a half coupling). Standard ASME B16.11 couplings may have a small unthreaded center. If continuous full-length threads are required, specify “full-length thread”.
Equivalent Grades of ASTM A182 F304L Stainless Steel Coupling Full Thread FNPT ASME B16.11 Forged Fittings
| STANDARD | UNS | WERKSTOFF NR. | EN | BS | GOST | JIS | AFNOR |
| SS 304L | S30403 | 1.4306/1.4307 | X2CrNi18-9 / X2CrNi19-11 | 304S11 | 03Х18Н11 | SUS 304L | Z3CN18‐10 |
Chemical Composition of ASTM A182 F304L Stainless Steel Coupling Full Thread FNPT ASME B16.11 Forged Fittings
| Grade | C | Mn | Si | P | S | Cr | Ni | N |
|---|---|---|---|---|---|---|---|---|
| 304L | 0.03max | 2.0max | 0.75max | 0.045max | 0.03max | min: 18.0 max: 20.0 | min: 8.0 max: 12.0 | 0.10 max |
Mechanical Properties of ASTM A182 F304L Stainless Steel Coupling Full Thread FNPT ASME B16.11 Forged Fittings
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 304L | 485 | 170 | 40 | 92 | 201 |
Applications
-
Primary Function
Connects two male NPT threaded pipes or fittings in a straight line. -
System Type
Used in small-bore, moderate-pressure, threaded piping systems. -
Chemical & Petrochemical Industry
Used for mild acids, solvents, organic chemicals, reagent dosing lines, and utility stations. -
Oil & Gas Industry
Used in non-sour, low-chloride utility services such as instrument air, fuel gas, lube oil, and utility water. -
Water Treatment
Used for potable water, wastewater, demineralized water, RO permeate, and low-chloride cooling water. -
Food, Beverage
Used only for utility lines such as steam, water, air, and CIP solutions.
Not recommended for direct sanitary product contact because threaded crevices can harbor bacteria. -
Power Generation
Used for condensate, low-chloride cooling water, instrument air, and low-pressure steam. -
Pulp & Paper
Used for pulp stock, white water, mild chemical lines, and utility piping. -
Marine & Offshore
Used only in low-chloride or non-chloride systems.
Not recommended for seawater or high-chloride service. -
General Industrial
Used for compressed air, inert gas, hydraulic return lines, lube lines, cooling lines, and instrument connections.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.