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 Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Compact straight connectors are able to fit into tight spaces. They are also known as merchant couplings.
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, DIN 909, or DIN 910, international standards for pipe plug dimensions.
For technical drawings and 3-D models, click on a part number.
- For Use With:
NPT, BSPP, and Metric: Air, Natural Gas, Oil, Steam, Water
NPTF: Air, Natural Gas, Steam, Water - Pressure Class:
NPT: 150 - Specifications Met:
BSPP and Metric: DIN 908 - Pipe Nipples and Pipe:
NPT: Use Schedule 40 steel
Plugs | Replacement Washers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Thread Size | Drive Size | Max. Pressure | Max. Steam Pressure | Material | Each | Pkg. Qty. | Pkg. | ||
Metric Male with Copper Washer | ||||||||||
| __ | M8 × 1 mm | 4 mm | Not Rated | Not Rated | Steel | 000000000 | 00000 | __ | 000000 | 00 |
| __ | M10 × 1 mm | 5 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M12 × 1.5 mm | 6 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M14 × 1.5 mm | 6 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M16 × 1.5 mm | 8 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M18 × 1.5 mm | 8 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M20 × 1.5 mm | 10 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M22 × 1.5 mm | 10 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M24 × 1.5 mm | 12 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M26 × 1.5 mm | 12 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M30 × 1.5 mm | 17 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | __ | 000000 | 00 |
| __ | M36 × 1.5 mm | 19 mm | Not Rated | Not Rated | Steel | 000000000 | 00000 | __ | 000000 | 00 |
| __ | M38 × 1.5 mm | 19 mm | Not Rated | Not Rated | Steel | 000000000 | 00000 | __ | 000000 | 00 |
| __ | M42 × 1.5 mm | 22 mm | Not Rated | Not Rated | Steel | 000000000 | 00000 | __ | 000000 | 00 |
BSPP Male with Copper Washer | ||||||||||
| 1/8 | __ | 5 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | 25 | 000000000 | 000000 |
| 1/4 | __ | 6 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | 25 | 000000000 | 00000 |
| 3/8 | __ | 8 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | 10 | 000000000 | 0000 |
| 1/2 | __ | 10 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 3/4 | __ | 12 mm | Not Rated | Not Rated | Steel | 000000000 | 0000 | 10 | 000000000 | 00000 |
| 1 | __ | 17 mm | Not Rated | Not Rated | Steel | 000000000 | 00000 | 5 | 000000000 | 00000 |
| 1 1/4 | __ | 22 mm | Not Rated | Not Rated | Steel | 000000000 | 00000 | 1 | 000000000 | 00000 |
| 1 1/2 | __ | 24 mm | Not Rated | Not Rated | Steel | 000000000 | 00000 | __ | 000000 | 00 |
| 2 | __ | 32 mm | Not Rated | Not Rated | Steel | 000000000 | 00000 | __ | 000000 | 00 |
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. 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.
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
Plugs | |||||||||
|---|---|---|---|---|---|---|---|---|---|
316 Stainless Steel | Replacement Washers | ||||||||
| Pipe Size | Thread Size | Drive Size | Max. Pressure | Max. Steam Pressure | Each | Pkg. Qty. | Pkg. | ||
Metric Male with Copper Washer | |||||||||
| __ | M8 × 1 mm | 4 mm | Not Rated | Not Rated | 0000000 | 000000 | __ | 000000 | 00 |
| __ | M10 × 1 mm | 5 mm | Not Rated | Not Rated | 000000 | 0000 | __ | 000000 | 00 |
| __ | M12 × 1.5 mm | 6 mm | Not Rated | Not Rated | 0000000 | 0000 | __ | 000000 | 00 |
| __ | M14 × 1.5 mm | 6 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |
| __ | M16 × 1.5 mm | 8 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |
| __ | M18 × 1.5 mm | 8 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |
| __ | M20 × 1.5 mm | 10 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |
| __ | M22 × 1.5 mm | 10 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |
| __ | M24 × 1.5 mm | 12 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |
| __ | M30 × 1.5 mm | 17 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |
BSPP Male with Copper Washer | |||||||||
| 1/8 | __ | 5 mm | Not Rated | Not Rated | 0000000 | 0000 | 25 | 000000000 | 000000 |
| 1/4 | __ | 6 mm | Not Rated | Not Rated | 000000 | 00000 | 25 | 000000000 | 00000 |
| 3/8 | __ | 8 mm | Not Rated | Not Rated | 0000000 | 00000 | 10 | 000000000 | 0000 |
| 1/2 | __ | 10 mm | Not Rated | Not Rated | 0000000 | 00000 | 10 | 000000000 | 00000 |
| 3/4 | __ | 12 mm | Not Rated | Not Rated | 0000000 | 00000 | 10 | 000000000 | 00000 |
| 1 | __ | 17 mm | Not Rated | Not Rated | 0000000 | 00000 | 5 | 000000000 | 00000 |
| 1 1/4 | __ | 22 mm | Not Rated | Not Rated | 0000000 | 00000 | 1 | 000000000 | 00000 |
| 1 1/2 | __ | 24 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |
| 2 | __ | 32 mm | Not Rated | Not Rated | 0000000 | 00000 | __ | 000000 | 00 |