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.
More
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.
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 |
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
30° Flared Fittings for Steel Tubing
- Specifications Met: See table
Also known as JIS (Japanese Industrial Standard) fittings, these have a 30° flare on one or both ends. Fittings are zinc-plated steel for fair corrosion resistance.
UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. They are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- Temperature Range: -65° to 500° F, except UN/UNF (SAE Straight) Fittings are -20° to 230° F
| For Tube OD | Pipe Size | Thread Size | Material | Gasket Material | Max. Pressure | Specifications Met | Each | |
BSPT Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 3/8" | 1/4 | __ | Zinc-Plated Steel | __ | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363 | 0000000 | 000000 |
| 1/2" | 3/8 | __ | Zinc-Plated Steel | __ | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363 | 0000000 | 00000 |
| 5/8" | 1/2 | __ | Zinc-Plated Steel | __ | 4,500 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363 | 0000000 | 00000 |
| 7/8" | 3/4 | __ | Zinc-Plated Steel | __ | 3,500 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363 | 0000000 | 00000 |
UN/UNF (SAE Straight) Threads | ||||||||
| 3/8" | 1/4 | 9/16"-18 | Zinc-Plated Steel | Buna-N Rubber | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363, SAE J1926 | 0000000 | 00000 |
| 3/8" | 3/8 | 7/16"-20 | Zinc-Plated Steel | Buna-N Rubber | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363, SAE J1926 | 0000000 | 00000 |
| 1/2" | 3/8 | 9/16"-18 | Zinc-Plated Steel | Buna-N Rubber | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363, SAE J1926 | 0000000 | 00000 |
- Temperature Range: -65° to 500° F
Fittings with female tube end have an internal flare that mates with the male tube end of another fitting.
| For Tube OD | Pipe Size | Material | Max. Pressure | Specifications Met | Each | |
| 3/8" | 1/4 | Zinc-Plated Steel | 5,000 psi @ 72° F | ISO 228-1, ISO 263, ISO 8434-2, JIS B 0202, JIS B 8363, SAE J514 | 0000000 | 000000 |