Stainless Steel BSPP-to-NPT Pipe Adapters

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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.

Extreme-Pressure Stainless Steel Threaded Pipe Fittings

With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance. BSPP and metric male threads have either a gasket or a gasket and washer to prevent leaks.

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

Straight Adapters, Female × Male

Straight Adapter

Specifications Met: See table
For Use With: See table

							316 Stainless Steel
Pipe Size (A)	Dash Size (A)	Pipe Size (B)	Dash Size (B)	Max. Pressure	For Use With	Specifications Met		Each
BSPP Female × NPT Male
1/8	02	1/8	02	6,000 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	000000
1/4	04	1/4	04	6,000 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000
3/8	06	3/8	06	6,000 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000
1/2	08	1/2	08	5,000 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000
3/4	12	3/4	12	4,500 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000
1	16	1	16	3,500 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000

Straight Adapters, Male

Front

BSPP and Metric
Male Threads with
Gasket and Washer

For Use With: See table
Specifications Met: See table

							316 Stainless Steel
Pipe Size (A)	Dash Size (A)	Pipe Size (B)	Dash Size (B)	Max. Pressure	For Use With	Specifications Met		Each
NPT Male × BSPP Male
1/8	02	1/8	02	6,000 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	000000
1/4	04	1/4	04	6,000 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000
3/8	06	3/8	06	6,000 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000
1/2	08	1/2	08	5,000 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000
3/4	12	3/4	12	4,500 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000
1	16	1	16	3,500 psi @ 72° F	Hydraulic Fluid, Oil, Water	ASME B1.20.3, ISO 1179, ISO 8434-6	0000000	00000

Replacement Washers

Temperature Range: -22° to 230° F

		316 Stainless Steel
For Pipe Size	Gasket Material	Thickness		Each
For BSPP Male
1/8	Buna-N Rubber	2mm	00000000	00000
1/4	Buna-N Rubber	2.03mm	00000000	0000
3/8	Buna-N Rubber	2mm	00000000	0000
1/2	Buna-N Rubber	2.5mm	00000000	0000
3/4	Buna-N Rubber	2.5mm	00000000	0000
1	Buna-N Rubber	3.2mm	00000000	00000

Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings

Made to tighter tolerances than other stainless steel pipe fittings, these are also known as instrumentation fittings. The male threads are rolled for extra strength in extreme-pressure applications. Fittings are commonly used to connect equipment in gas and hydraulic fluid lines. They are 316 stainless steel for excellent corrosion resistance.

BSPP male threads have a gasket and washer to prevent leaks.

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

Straight Adapters, Female × Male

BSPP Male
Threads with
Gasket and Washer

For Use With:
NPT × BSPP: Natural Gas, Water
All others: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
Specifications Met:
NPT × NPT: ASME B1.20.1, ASME B31.1, ASME B31.3
NPT × BSPP: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A276, ASTM A479, ISO 228.1, ISO 228.2, ISO BS 2779
BSPP × NPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 228.1, ISO 228.2, ISO BS 2779
NPT × BSPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 7.1, ISO BS2.1
BSPT × NPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 7.1, ISO BS2.1

NPT Female × BSPP Male
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure		Each
1/8	__	5,300 psi @ 72° F	__	00000000	000000
1/4	__	5,500 psi @ 72° F	__	00000000	00000
3/8	__	4,400 psi @ 72° F	__	00000000	00000
1/2	__	4,000 psi @ 72° F	__	00000000	00000
3/4	__	3,700 psi @ 72° F	__	00000000	000000
1	__	2,800 psi @ 72° F	__	00000000	000000
BSPP Female × NPT Male
1/8	02	6,100 psi @ 72° F	6,100 psi @ 300° F	0000000	00000
1/4	04	6,200 psi @ 72° F	6,200 psi @ 300° F	0000000	00000
3/8	06	5,000 psi @ 72° F	5,000 psi @ 300° F	0000000	00000
1/2	08	4,600 psi @ 72° F	4,600 psi @ 300° F	0000000	00000
3/4	12	4,300 psi @ 72° F	4,300 psi @ 300° F	0000000	00000
1	16	4,100 psi @ 72° F	4,100 psi @ 300° F	0000000	000000

Straight Adapters, Male

Straight Adapter, Male Threaded Pipe

BSPP Male
Threads with
Gasket and Washer

For Use With:
NPT × BSPP: Natural Gas, Water
NPT × BSPT and UN/UNF (SAE Straight) Male × NPT Male: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
Specifications Met:
NPT × BSPP: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A276, ASTM A479, ISO 228.1, ISO 228.2, ISO BS 2779
NPT × BSPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 7.1, ISO BS2.1
UN/UNF (SAE Straight) Male × NPT Male: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479, SAE J1926

NPT Male × BSPP Male
Pipe Size (A)	Pipe Size (B)	Max. Pressure		Each
1/8	1/8	5,300 psi @ 72° F	00000000	000000
1/4	1/4	5,500 psi @ 72° F	00000000	00000
3/8	3/8	4,400 psi @ 72° F	00000000	00000
1/2	1/2	4,000 psi @ 72° F	00000000	00000
3/4	3/4	3,700 psi @ 72° F	00000000	00000
1	1	2,800 psi @ 72° F	00000000	000000

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these fittings in a low-pressure pipe line. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

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

Straight Adapters, Male

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met:
BSPP × NPT and 316 Stainless Steel BSPT × NPT: ASTM A351
304 Stainless Steel BSPT × NPT: ASME B1.20.1, DIN EN 10226
Fabrication: Heat Treated
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

			304 Stainless Steel		316 Stainless Steel
Pipe Size	Max. Steam Pressure	Max. Pressure		Each		Each
BSPP Male × NPT Male
1/8	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	00000000	00000
1/4	150 psi @ 350° F	300 psi @ 72° F	00000000	0000	00000000	0000
3/8	150 psi @ 350° F	300 psi @ 72° F	00000000	0000	00000000	0000
1/2	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	00000000	00000
3/4	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	00000000	00000
1	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	00000000	00000
1 1/4	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	00000000	00000
1 1/2	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	00000000	00000
2	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	00000000	00000

Straight Reducing Adapters

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met:
BSPP × NPT and 316 Stainless Steel BSPT × NPT: ASTM A351
304 Stainless Steel BSPT × NPT: ASME B1.20.1, DIN EN 10226
Fabrication: Heat Treated
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

Pipe Size				304 Stainless Steel		316 Stainless Steel
(A)	(B)	Max. Pressure	Max. Steam Pressure		Each		Each
BSPP Male × NPT Male
1/4	1/8	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
3/8	1/8	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	00000
3/8	1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	00000
1/2	1/8	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1/2	1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1/2	3/8	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
3/4	1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
3/4	3/8	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1	3/8	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
1	3/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1 1/4	3/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1 1/4	1	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1 1/2	3/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1 1/2	1	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1 1/2	1 1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
2	1	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
2	1 1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
2	1 1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000