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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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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.
Plugs with copper washer form a tight seal to prevent leaks. Also known as a crush washer, the washer compresses and deforms to fill gaps when tightened. Because it loses its shape when compressed, it’s not reusable. Made of copper, the washer resists rust. These plugs meet either DIN 908 or DIN 910, international standards for pipe plug dimensions.
Plugs with magnet attract metal debris that could otherwise damage your system.
NPTF (Dryseal) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class:
NPTF: 150 - Specifications Met:
Metric and BSPP: DIN 908 - Pipe Nipples and Pipe:
NPTF: Use Schedule 40 stainless steel - Flanges:
NPTF: Use Class 150 stainless steel
| Pipe Size | Thread Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | |
302 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
NPTF Male | ||||||
| 1/16 | __ | 5/32" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
| 1/8 | __ | 3/16" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 000 |
| 1/4 | __ | 1/4" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 0000 |
| 3/8 | __ | 5/16" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 0000 |
| 1/2 | __ | 3/8" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 0000 |
| 3/4 | __ | 9/16" | 150 psi @ 72° F | 150 psi @ 360° F | 00000000 | 0000 |
304 Stainless Steel | ||||||
NPTF Male | ||||||
| 1 | __ | 5/8" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | __ | 3/4" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
| 1 1/2 | __ | 1" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
| 2 | __ | 1" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
316 Stainless Steel | ||||||
NPTF Male | ||||||
| 1/16 | __ | 5/32" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 0000 |
| 1/8 | __ | 3/16" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 0000 |
| 1/4 | __ | 1/4" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 0000 |
| 3/8 | __ | 5/16" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 0000 |
| 1/2 | __ | 3/8" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 0000 |
| 3/4 | __ | 9/16" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
| 1 | __ | 5/8" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
| 1 1/4 | __ | 3/4" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
| 1 1/2 | __ | 1" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
| 2 | __ | 1" | 270 psi @ 72° F | 180 psi @ 360° F | 00000000 | 00000 |
NPTF Male with Magnet | ||||||
| 1/8 | __ | 3/16" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 0000 |
| 1/4 | __ | 1/4" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 0000 |
| 3/8 | __ | 5/16" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 0000 |
| 1/2 | __ | 3/8" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 0000 |
| 3/4 | __ | 9/16" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 0000 |
| 1 | __ | 5/8" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 00000 |
| 1 1/4 | __ | 3/4" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 00000 |
| 1 1/2 | __ | 1" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 00000 |
| 2 | __ | 1" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 00000 |
| 2 1/2 | __ | 1" | 270 psi @ 72° F | 180 psi @ 360° F | 0000000 | 000000 |
Metric Male with Copper Washer | ||||||
| __ | M8 × 1 mm | 4 mm | Not Rated | Not Rated | 0000000 | 0000 |
| __ | M10 × 1 mm | 5 mm | Not Rated | Not Rated | 000000 | 0000 |
| __ | M12 × 1.5 mm | 6 mm | Not Rated | Not Rated | 0000000 | 0000 |
| __ | M14 × 1.5 mm | 6 mm | Not Rated | Not Rated | 0000000 | 0000 |
| __ | M16 × 1.5 mm | 8 mm | Not Rated | Not Rated | 0000000 | 00000 |
| __ | M18 × 1.5 mm | 8 mm | Not Rated | Not Rated | 0000000 | 00000 |
| __ | M20 × 1.5 mm | 10 mm | Not Rated | Not Rated | 0000000 | 00000 |
| __ | M22 × 1.5 mm | 10 mm | Not Rated | Not Rated | 0000000 | 00000 |
| __ | M24 × 1.5 mm | 12 mm | Not Rated | Not Rated | 0000000 | 00000 |
| __ | M30 × 1.5 mm | 17 mm | Not Rated | Not Rated | 0000000 | 00000 |
BSPP Male with Copper Washer | ||||||
| 1/8 | __ | 5 mm | Not Rated | Not Rated | 0000000 | 0000 |
| 1/4 | __ | 6 mm | Not Rated | Not Rated | 000000 | 00000 |
| 3/8 | __ | 8 mm | Not Rated | Not Rated | 0000000 | 00000 |
| 1/2 | __ | 10 mm | Not Rated | Not Rated | 0000000 | 00000 |
| 3/4 | __ | 12 mm | Not Rated | Not Rated | 0000000 | 00000 |
| 1 | __ | 17 mm | Not Rated | Not Rated | 0000000 | 00000 |
| 1 1/4 | __ | 22 mm | Not Rated | Not Rated | 0000000 | 00000 |
| 1 1/2 | __ | 24 mm | Not Rated | Not Rated | 0000000 | 00000 |
| 2 | __ | 32 mm | Not Rated | Not Rated | 0000000 | 00000 |
High-Pressure Stainless Steel Threaded Pipe Fittings
Use these heavy duty fittings in high-pressure flow applications.
316 stainless steel fittings have excellent corrosion resistance. 347 stainless steel fittings have excellent corrosion resistance and can withstand prolonged heat exposure.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: MS27769, SAE AS4842, SAE AS71051
347 Stainless Steel | |||||
|---|---|---|---|---|---|
| Pipe Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | |||||
| 1/16 | 5/32" | 3,000 psi @ 72° F | 600 psi @ 220° F | 0000000 | 00000 |
| 1/8 | 3/16" | 3,000 psi @ 72° F | 600 psi @ 220° F | 0000000 | 0000 |
| 1/4 | 1/4" | 3,000 psi @ 72° F | 600 psi @ 220° F | 0000000 | 0000 |
| 3/8 | 5/16" | 3,000 psi @ 72° F | 600 psi @ 220° F | 0000000 | 00000 |
| 1/2 | 3/8" | 3,000 psi @ 72° F | 600 psi @ 220° F | 0000000 | 00000 |
| 3/4 | 9/16" | 3,000 psi @ 72° F | 600 psi @ 220° F | 0000000 | 00000 |
| 1 | 5/8" | 3,000 psi @ 72° F | 600 psi @ 220° F | 0000000 | 000000 |
- For Use With: Air, Coolant, Diesel Fuel, Steam, Hydraulic Fluid, Natural Gas, Oil, Water
- Specifications Met: NSF/ANSI 169
- Pipe Nipples and Pipe: Use Schedule 80 stainless steel
- Temperature Range: -100° to 550° F
316 Stainless Steel | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Size | Thread Pitch, mm | Dash Size | Lg., mm | Drive Size | Plug Construction | Max. Pressure | Max. Steam Pressure | Max. Vacuum | Each | |
BSPT Male | |||||||||||
| 1/8 | __ | __ | 02 | 7.5 | 5 mm | Solid | 2,000 psi @ 72° F | Not Rated | 29 in. of Hg @ 72° F | 00000000 | 000000 |
| 1/4 | __ | __ | 04 | 10 | 6 mm | Solid | 2,000 psi @ 72° F | Not Rated | 29 in. of Hg @ 72° F | 00000000 | 00000 |
| 3/8 | __ | __ | 06 | 11 | 8 mm | Solid | 2,000 psi @ 72° F | Not Rated | 29 in. of Hg @ 72° F | 00000000 | 00000 |
| 1/2 | __ | __ | 08 | 13 | 10 mm | Solid | 2,000 psi @ 72° F | Not Rated | 29 in. of Hg @ 72° F | 00000000 | 00000 |
BSPP Male | |||||||||||
| 1/8 | __ | __ | 02 | 8.5 | 5 mm | Solid | 2,000 psi @ 72° F | Not Rated | 29 in. of Hg @ 72° F | 00000000 | 00000 |
| 1/4 | __ | __ | 04 | 11 | 6 mm | Solid | 2,000 psi @ 72° F | Not Rated | 29 in. of Hg @ 72° F | 00000000 | 00000 |
Metric Male | |||||||||||
| __ | M5 | 0.8 | __ | 6 | 2 mm | Solid | 2,000 psi @ 72° F | Not Rated | 29 in. of Hg @ 72° F | 00000000 | 00000 |
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.
NPTF (Dryseal) threads are compatible with NPT threads. 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.
- For Use With:
NPTF: Hydraulic Fluid, Oil, Steam, Water
BSPP and Metric: Hydraulic Fluid, Oil, Water - Specifications Met:
NPTF: ASTM A479
Metric: DIN 7631, ISO 9974
BSPP: ISO 1179, ISO 8434-6
316 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Size | Dash Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | |
NPTF Male | |||||||
| 1/8 | __ | 02 | 3/16" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 1/4 | __ | 04 | 1/4" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 0000 |
| 3/8 | __ | 06 | 5/16" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 1/2 | __ | 08 | 3/8" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 3/4 | __ | 12 | 9/16" | 6,600 psi @ 72° F | 6,600 psi @ 300° F | 000000000 | 00000 |
| 1 | __ | 16 | 5/8" | 5,300 psi @ 72° F | 5,300 psi @ 300° F | 000000000 | 00000 |
Metric Male | |||||||
| __ | M10 × 1 mm | __ | 5 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M12 × 1.5 mm | __ | 6 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M14 × 1.5 mm | __ | 6 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M16 × 1.5 mm | __ | 8 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M18 × 1.5 mm | __ | 8 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M20 × 1.5 mm | __ | 10 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M22 × 1.5 mm | __ | 10 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M26 × 1.5 mm | __ | 12 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M27 × 2 mm | __ | 12 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| __ | M33 × 2 mm | __ | 17 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
BSPP Male | |||||||
| 1/8 | __ | 02 | 5 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| 1/4 | __ | 04 | 6 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| 3/8 | __ | 06 | 8 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| 1/2 | __ | 08 | 10 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| 3/4 | __ | 12 | 12 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| 1 | __ | 16 | 17 mm | 5,800 psi @ 72° F | __ | 00000000 | 00000 |
| 1 1/4 | __ | 20 | 22 mm | 4,500 psi @ 72° F | __ | 00000000 | 000000 |
| 1 1/2 | __ | 24 | 24 mm | 4,500 psi @ 72° F | __ | 00000000 | 000000 |
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.
For technical drawings and 3-D models, click on a part number.
- For Use With: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water
- Specifications Met:
1/2 Pipe Size: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479
All other sizes: ASME B1.20.1, ASME B31.1, ASME B31.3
316 Stainless Steel | ||||||
|---|---|---|---|---|---|---|
| Pipe Size | Dash Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | |
NPT Male | ||||||
| 1/16 | __ | 5/32" | 10,000 psi @ 72° F | 10,000 psi @ 300° F | 000000000 | 000000 |
| 1/8 | 02 | 3/16" | 9,100 psi @ 72° F | 9,100 psi @ 300° F | 000000000 | 00000 |
| 1/4 | 04 | 1/4" | 7,500 psi @ 72° F | 7,500 psi @ 300° F | 000000000 | 00000 |
| 3/8 | 06 | 5/16" | 7,200 psi @ 72° F | 7,200 psi @ 300° F | 000000000 | 00000 |
| 1/2 | 08 | 3/8" | 7,700 psi @ 72° F | 7,700 psi @ 300° F | 000000000 | 00000 |