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 Hex Head Screws and Bolts
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Stainless Steel Hex Screw and Nut Kits for Pipe Flanges
Join standard-sized stainless steel and aluminum pipe flanges in corrosive conditions. These kits come with the right size and number of screws and nuts for the bolt holes in each pipe size. For a tight seal, you’ll also need a gasket between the flanges. All screws and nuts meet ASTM and ASME standards or DIN standards for material quality and dimensions. They may be mildly magnetic. Screw length is measured from under the head.
316 stainless steel fasteners are more corrosion resistant than 18-8 stainless steel fasteners and have excellent resistance to chemicals and salt water.
Screw | Nut | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size  | For DN Flange Size | Lg., mm | Min. Thread Lg., mm | Head Wd., mm | Head Ht., mm | Tensile Strength, psi | Wd., mm | Ht., mm | No. of Screws Included | No. of Nuts Included | Each | |
18-8 Stainless Steel | ||||||||||||
M12 × 1.75 mm | ||||||||||||
| 1 | 25 | 50 | 30 | 19 | 7.7 | 80,000 | 19 | 10 | 4 | 4 | 000000000 | 00000 |
316 Stainless Steel | ||||||||||||
M12 × 1.75 mm | ||||||||||||
| 1 | 25 | 50 | 30 | 19 | 7.7 | 80,000 | 19 | 10 | 4 | 4 | 000000000 | 0000 |
Steel Hex Screw and Nut Kits for Pipe Flanges
Connect standard-sized steel and cast iron pipe flanges. These kits come with the right size and number of screws and nuts for the bolt holes in each pipe size. For a tight seal, you’ll also need a gasket between the flanges. All screws and nuts meet ASTM and ASME standards or DIN standards for material quality and dimensions. Screw length is measured from under the head.
Zinc-plated fasteners resist corrosion in wet environments.
Screw | Nut | Zinc-Plated Steel | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Pipe Size | For DN Flange Size | Lg., mm | Min. Thread Lg., mm | Head Wd., mm | Head Ht., mm | Tensile Strength, psi | Wd., mm | Ht., mm | No. of Screws Included | No. of Nuts Included | Each | |
M12 × 1.75 mm | ||||||||||||
| 1 | 25 | 50 | 30 | 19 | 7.5 | 110,000 | 19 | 10 | 4 | 4 | 000000000 | 00000 |
Low-Pressure Brass and Bronze Threaded Pipe Fittings
Use these fittings in low-pressure flow applications. They have good corrosion resistance.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration. Locknuts that meet DIN 431 adhere to international standards for locknut dimensions.
- For Use With: See table
- Pressure Class: See table
- Specifications Met: See table
- Pipe Nipples and Pipe: See table
- Flanges: See table
For Pipe | For Flange | |||||||
|---|---|---|---|---|---|---|---|---|
| Pipe Size | Max. Pressure | Material | Material | Material | For Use With | Specifications Met | Each | |
BSPP Female | ||||||||
| 1 | Not Rated | Brass | Brass | Brass | Air, Natural Gas, Oil | DIN 431 | 0000000 | 000000 |
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.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration. Locknuts that meet DIN 431 comply with international standards for pipe fitting locknut dimensions.
NPTF (Dryseal) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class:
NPSL: 150 - Fabrication:
NPSL: Heat Treated - Specifications Met:
NPSL: ANSI/MSS SP-114, ASTM A351
BSPP: DIN 431 - Pipe Nipples and Pipe:
NPSL: Use Schedule 40 stainless steel - Flanges:
NPSL: Use Class 150 stainless steel
304 Stainless Steel | ||||
|---|---|---|---|---|
| Pipe Size | Max. Pressure | Max. Steam Pressure | Each | |
BSPP Female | ||||
| 1 | Not Rated | Not Rated | 00000000 | 000000 |
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration. Some meet DIN 431, which is an international standard for pipe fitting locknut dimensions.
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class:
NPT: 125
NPSL: 150 - Specifications Met:
NPT: ASME B1.20.1, ASME B16.4
NPSL: ASME B16.14
BSPP: DIN 431 - Pipe Nipples and Pipe:
NPT, NPSL: Use Schedule 40 steel
| Pipe Size | Material | Each | |
BSPP Female | |||
|---|---|---|---|
| 1 | Steel | 0000000 | 000000 |