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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About Nuts, Materials, and Finishes
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Low-Pressure Steel Unthreaded Pipe Flanges
Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a gasket (sold separately) to create an access point in a pipe line. Flanges are for use with low-pressure applications in noncorrosive environments.
Slip-on weld flanges have no internal stop. Slide a pipe through the flange and weld on both sides.
Cap flanges are also known as blind flanges.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: See table
- Specifications Met: See table
- Certification: See table
- Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: See Table
Bolt Hole | For Fitting | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size  | Flange OD | For Bolt Dia. | Dia. | No. of | Bolt Circle Dia. | Max. Pressure | Max. Steam Pressure | Schedule | Material | Specifications Met | Each | |
| 1 | 4 59/64" | 5/8" | 0.748" | 4 | 3 35/64" | Not Rated | Not Rated | 40 | Iron, Steel | ASTM A105, JIS B 2220 | 0000000 | 000000 |
| 1 1/2 | 5 33/64" | 5/8" | 0.748" | 4 | 4 9/64" | Not Rated | Not Rated | 40 | Iron, Steel | ASTM A105, JIS B 2220 | 0000000 | 00000 |
| 2 | 6 7/64" | 5/8" | 0.748" | 4 | 4 23/32" | Not Rated | Not Rated | 40 | Iron, Steel | ASTM A105, JIS B 2220 | 0000000 | 00000 |
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class: See table
- Specifications Met: See table
- Certification: Material Certificate with Traceable Lot Number and Test Report
- Pipe Nipples and Pipe: Use Schedule 40 steel
- Fittings: Use Schedule 40 iron or steel
JIS High-Strength Steel Flange Nuts
These metric nuts meet JIS (Japanese Industrial Standard) B 1190. They have a flange that distributes pressure where the nut meets the material surface, eliminating the need for a separate washer. About 25% stronger than medium-strength steel flange nuts, they're comparable in strength to Class 10.9 bolts. Height includes the flange.
When choosing your finish, consider your environment. Zinc-plated nuts have a layer of zinc that protects the steel under it from rust, extending the life of the nuts. A black-phosphate finish shields nuts from rusting, even amid oil and grease.
For technical drawings and 3-D models, click on a part number.
Thread | Flange | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Wd., mm | Ht., mm | Dia., mm | Thick., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 10 | |||||||||
| M5 | 0.8 | 8 | 5 | 11.8 | 0.7 | JIS B 1190 | 50 | 000000000 | 00000 |
| M6 | 1 | 10 | 6 | 14 | 0.8 | JIS B 1190 | 100 | 000000000 | 0000 |
| M8 | 1.25 | 12 | 8 | 17.5 | 1 | JIS B 1190 | 50 | 000000000 | 0000 |
| M10 | 1 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 1 | 000000000 | 0000 |
| M10 | 1.25 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 10 | 000000000 | 00000 |
| M12 | 1.25 | 17 | 11.5 | 25 | 1.4 | JIS B 1190 | 25 | 000000000 | 0000 |
Black-Phosphate Steel—Class 10 | |||||||||
| M6 | 1 | 10 | 6 | 14 | 0.8 | JIS B 1190 | 100 | 000000000 | 00000 |
| M8 | 1.25 | 12 | 8 | 17.5 | 1.1 | JIS B 1190 | 100 | 000000000 | 00000 |
| M10 | 1.25 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 50 | 000000000 | 00000 |
JIS Medium-Strength Steel Flange Nuts
Made to Japanese Industrial Standards, these nuts fasten most Japanese machinery and equipment without a washer. Their flange distributes pressure where the nut meets the material surface, so there’s no need for a washer. Zinc plated, these nuts won’t rust.
For technical drawings and 3-D models, click on a part number.
Thread | Flange | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Width, mm | Height, mm | Diameter, mm | Thickness, mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | |||||||||
| M3 | 0.5 | 5.5 | 3.7 | 8 | 0.6 | JIS B 1190 | 100 | 000000000 | 000000 |
| M4 | 0.7 | 7 | 4.2 | 10.5 | 0.6 | JIS B 1190 | 100 | 000000000 | 00000 |
| M5 | 0.8 | 8 | 5 | 11.8 | 0.7 | JIS B 1190 | 100 | 000000000 | 00000 |
| M6 | 1 | 10 | 6 | 14 | 0.8 | JIS B 1190 | 100 | 000000000 | 00000 |
| M8 | 1 | 12 | 8 | 17.5 | 1.1 | JIS B 1190 | 10 | 000000000 | 00000 |
| M8 | 1.25 | 12 | 8 | 17.5 | 1.1 | JIS B 1190 | 25 | 000000000 | 00000 |
| M10 | 1 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 10 | 000000000 | 00000 |
| M10 | 1.25 | 14 | 10 | 21 | 1.2 | JIS B 1190 | 5 | 000000000 | 0000 |
| M12 | 1.25 | 17 | 11.5 | 25 | 1.4 | JIS B 1190 | 5 | 000000000 | 0000 |
| M12 | 1.75 | 17 | 11.5 | 25 | 1.4 | JIS B 1190 | 5 | 000000000 | 0000 |