Stainless Steel Pipe Half Couplings

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How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these fittings in a low-pressure pipe line.

Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

Threaded female x butt weld straight adapters are also known as half couplings. Adapters with weld end allow for a permanent connection.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, Threaded Female × Butt Weld

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Fabrication: Heat Treated
Specifications Met:
NPT × Butt Weld: ANSI/MSS SP-114, ASTM A351
BSPT × Butt Weld: ANSI/MSS SP-114
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

			304 Stainless Steel		316 Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each		Each
NPT Female × Butt Weld
1/8	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
3/8	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
3/4	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
1	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
1 1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1 1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
2 1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
3	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
4	300 psi @ 72° F	150 psi @ 350° F	00000000	000000	00000000	000000
BSPT Female × Butt Weld
1/8	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	000000	00
1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	000000	00
3/8	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	000000	00
1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	000000	00
3/4	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	000000	00
1	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	000000	00
1 1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	000000	00
2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	000000	00

Premium Low-Pressure Stainless Steel Threaded Pipe Fittings with Certification

Unlike other stainless steel fittings, these are made in the U.S.A. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings except 1/4" and 3/8" plugs and plugs with hex drive adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 150 low-pressure stainless steel fittings. They also meet either ASTM A351 or A479 requirements for parts that will be used in pressure systems.

These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong. 304 stainless steel fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals. 316 stainless steel fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.

For technical drawings and 3-D models, click on a part number.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Straight Adapters, Threaded Female × Butt Weld

Straight Adapter

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Fabrication: Heat Treated
Specifications Met: See table
Certification: Material Certificate with Traceable Lot Number
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

304 Stainless Steel
Pipe Size	Pressure Class	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
NPT Female × Butt Weld
1 1/2	150	300 psi @ 72° F	150 psi @ 350° F	ANSI/MSS SP-114, ASTM A351	000000000	000000
2	150	300 psi @ 72° F	150 psi @ 350° F	ANSI/MSS SP-114, ASTM A351	000000000	00000
3	150	300 psi @ 72° F	150 psi @ 350° F	ANSI/MSS SP-114, ASTM A351	000000000	000000
4	150	300 psi @ 72° F	150 psi @ 350° F	ANSI/MSS SP-114, ASTM A351	000000000	000000
316 Stainless Steel
NPT Female × Butt Weld
1 1/2	150	300 psi @ 72° F	150 psi @ 350° F	ANSI/MSS SP-114, ASTM A351	000000000	00000
2	150	300 psi @ 72° F	150 psi @ 350° F	ANSI/MSS SP-114, ASTM A351	000000000	00000
3	150	300 psi @ 72° F	150 psi @ 350° F	ANSI/MSS SP-114, ASTM A351	000000000	000000
4	150	300 psi @ 72° F	150 psi @ 350° F	ANSI/MSS SP-114, ASTM A351	000000000	000000

High-Pressure Stainless Steel Threaded Pipe Fittings

Use these heavy duty fittings in high-pressure flow applications.

304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance. Threaded female x butt weld straight adapters are also known as half couplings.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, Threaded Female × Butt Weld

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASTM A182, ASME B16.11
Pipe Nipples and Pipe: Use Schedule 80 stainless steel

304 Stainless Steel
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
NPT Female × Butt Weld
1/8	02	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
1/4	04	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	0000
3/8	06	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
1/2	08	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
3/4	12	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
1	16	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
1 1/4	20	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
1 1/2	24	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
2	32	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	00000
2 1/2	40	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
3	48	2,500 psi @ 72° F	1,900 psi @ 350° F	000000000	000000
316 Stainless Steel
NPT Female × Butt Weld
1/8	02	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	00000
1/4	04	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	00000
3/8	06	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	00000
1/2	08	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	00000
3/4	12	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	00000
1	16	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	00000
1 1/4	20	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	00000
1 1/2	24	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	00000
2	32	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	000000
2 1/2	40	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	000000
3	48	3,000 psi @ 72° F	2,800 psi @ 350° F	00000000	000000

Medium-Pressure Stainless Steel Threaded Pipe Fittings

Choose these fittings when you want the same high-quality found in our low-pressure pipe fittings, but need more strength to handle higher pressures.

Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking.

304 stainless steel fittings have very good corrosion resistance.

316 stainless steel fittings have excellent corrosion resistance.

Threaded female x butt weld straight adapters are also known as half couplings.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, Threaded Female x Butt Weld

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class : 1000
Specifications Met: ANSI/MSS SP-114, ASTM A182
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

			304 Stainless Steel		316 Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each		Each
NPT Female × Butt Weld
1/8	1,000 psi @ 72° F	650 psi @ 350° F	00000000	00000	00000000	00000
1/4	1,000 psi @ 72° F	650 psi @ 350° F	00000000	0000	00000000	0000
3/8	1,000 psi @ 72° F	650 psi @ 350° F	00000000	0000	00000000	0000
1/2	1,000 psi @ 72° F	650 psi @ 350° F	00000000	0000	00000000	0000
3/4	1,000 psi @ 72° F	650 psi @ 350° F	00000000	0000	00000000	0000
1	1,000 psi @ 72° F	650 psi @ 350° F	00000000	00000	00000000	00000
1 1/4	1,000 psi @ 72° F	650 psi @ 350° F	0000000	00000	00000000	00000
1 1/2	1,000 psi @ 72° F	650 psi @ 350° F	0000000	00000	00000000	00000
2	1,000 psi @ 72° F	650 psi @ 350° F	0000000	00000	00000000	00000
2 1/2	1,000 psi @ 72° F	650 psi @ 350° F	00000000	00000	00000000	000000
3	1,000 psi @ 72° F	650 psi @ 350° F	00000000	000000	00000000	000000
4	1,000 psi @ 72° F	650 psi @ 350° F	00000000	000000	00000000	000000

High-Pressure Socket-Connect Stainless Steel Unthreaded Pipe Fittings

Forged for excellent strength, these heavy duty socket-connect fittings stand up to high-pressure applications. They are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection.

304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

Socket connect x butt weld straight adapters are also known as half couplings.

For technical drawings and 3-D models, click on a part number.

Straight Adapters

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: 3000
Specifications Met: ASME B16.11, ASTM A182
Pipe Nipples and Pipe: Use Schedule 80 stainless steel

304/304L Stainless Steel
Pipe Size	Dash Size	Max. Steam Pressure	Max. Pressure		Each
Socket Connect × Butt Weld
1/8	02	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	000000
1/4	04	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
3/8	06	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
1/2	08	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
3/4	12	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
1	16	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
1 1/2	24	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	00000
2	32	1,900 psi @ 350° F	2,500 psi @ 72° F	000000000	000000
316/316L Stainless Steel
Socket Connect × Butt Weld
1/8	02	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
1/4	04	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
3/8	06	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
1/2	08	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
3/4	12	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
1	16	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	00000
2	32	1,900 psi @ 350° F	3,000 psi @ 72° F	000000000	000000