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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.
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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.
Straight Adapters, Female × Male
BSPP Male
Threads with
Gasket and Washer
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
Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Female × BSPP Male | |||||
|---|---|---|---|---|---|
| 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
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