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Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.
Low-Pressure Iron and Steel Threaded Pipe Locknuts
 |
Use these locknuts 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.
NPTF (Dryseal) threads, NPSC (National Pipe Straight Coupling) threads, and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
DIN 431—Locknuts that meet DIN 431 comply with international standards for pipe locknut dimensions.
For Pipe | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Hex Wd. | Lg. | Max. Pressure @ Temp. | Max. Steam Pressure @ Temp. | For Use With | Pressure Class | Material | Schedule | Material | For Flange Material | Specs. Met | Each | |||
NPSL Female | |||||||||||||||
| 1/4 | 27/32" | 1/4" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Steel | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K434 | 00000 | ||
| 3/8 | 1" | 9/32" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Iron | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K211 | 0000 | ||
| 1/2 | 1 3/16" | 5/16" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Iron | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K212 | 0000 | ||
| 3/4 | 1 7/16" | 11/32" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Iron | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K213 | 0000 | ||
| 1 | 1 3/4" | 3/8" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Iron | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K214 | 00000 | ||
| 1 1/4 | 2 3/32" | 27/64" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Iron | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K215 | 0000 | ||
| 1 1/2 | 2 11/32" | 15/32" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Iron | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K216 | 00000 | ||
| 2 | 2 7/8" | 17/32" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Iron | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K217 | 00000 | ||
BSPP Female | |||||||||||||||
| 1/8 | 19 mm | 6 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N11 | 0000 | ||
| 1/4 | 22 mm | 6 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N12 | 0000 | ||
| 3/8 | 27 mm | 7 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N13 | 0000 | ||
| 1/2 | 32 mm | 8 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N14 | 0000 | ||
| 3/4 | 36 mm | 9 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N15 | 0000 | ||
| 1 | 46 mm | 10 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N16 | 00000 | ||
| 1 1/4 | 55 mm | 11 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N17 | 00000 | ||
| 1 1/2 | 60 mm | 12 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N18 | 00000 | ||
| 2 | 75 mm | 13 mm | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | Steel | — | Steel | Steel | DIN 431 | 3555N19 | 00000 | ||
Extreme-Pressure Steel Threaded Pipe Locknuts
 |
The strongest steel locknuts we offer, these can withstand extreme-pressure applications.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
For Pipe | For Flange | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Dash Size | Hex Wd. | Lg. | Gasket Material | Max. Pressure @ Temp. | Max. Steam Pressure @ Temp. | For Use With | Temp. Range, ° F | Material | Fabrication | Schedule | Material | Class | Material | Each | |||
NPT Female | ||||||||||||||||||
| 1/8 | 02 | 5/8" | 3/16" | PTFE | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K14 | 000000 | ||
| 1/4 | 04 | 3/4" | 9/32" | PTFE | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K16 | 00000 | ||
| 3/8 | 06 | 7/8" | 9/32" | PTFE | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K18 | 00000 | ||
| 1/2 | 08 | 1 1/8" | 19/64" | PTFE | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K19 | 00000 | ||
| 3/4 | 12 | 1 5/16" | 19/64" | PTFE | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K21 | 00000 | ||
| 1 | 16 | 1 5/8" | 25/64" | PTFE | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K23 | 00000 | ||
| 1 1/4 | 20 | 2" | 25/64" | PTFE | 5,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K25 | 00000 | ||
| 1 1/2 | 24 | 2 1/4" | 25/64" | PTFE | 3,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K27 | 00000 | ||
| 2 | 32 | 2 3/4" | 27/64" | PTFE | 3,000 psi @ 72° F | 5,000 psi @ 500° F | Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water | -100 to 500 | Zinc-Yellow-Chromate-Plated Steel | Machined | XXH | Steel | 1500 | Steel | 5530K29 | 000000 | ||
Low-Pressure Galvanized Iron and Steel Threaded Pipe Locknuts
 |
The galvanized finish on these locknuts provides fair corrosion resistance. Locknuts are for use in low-pressure applications.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
NPSL Thread—NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For Pipe | For Flange | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Hex Wd. | Lg. | Max. Pressure @ Temp. | Max. Steam Pressure @ Temp. | For Use With | Pressure Class | Material | Schedule | Material | Class | Material | Specs. Met | Each | |||
NPSL Female | ||||||||||||||||
| 1/4 | 27/32" | 1/4" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Galvanized Iron | 40 | Galvanized Steel | 150 | Galvanized Steel | ASME B16.14 | 4638K612 | 00000 | ||
| 3/8 | 1" | 0.28" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Galvanized Iron | 40 | Galvanized Steel | 150 | Galvanized Steel | ASME B16.14 | 4638K613 | 0000 | ||
| 1/2 | 1 3/16" | 0.31" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Galvanized Iron | 40 | Galvanized Steel | 150 | Galvanized Steel | ASME B16.14 | 4638K614 | 0000 | ||
| 3/4 | 1 7/16" | 0.34" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Galvanized Iron | 40 | Galvanized Steel | 150 | Galvanized Steel | ASME B16.14 | 4638K615 | 0000 | ||
| 1 | 1 3/4" | 0.38" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Galvanized Iron | 40 | Galvanized Steel | 150 | Galvanized Steel | ASME B16.14 | 4638K616 | 00000 | ||
| 1 1/4 | 2 3/32" | 0.42" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Galvanized Iron | 40 | Galvanized Steel | 150 | Galvanized Steel | ASME B16.14 | 4638K617 | 00000 | ||
| 1 1/2 | 2 11/32" | 0.47" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Galvanized Iron | 40 | Galvanized Steel | 150 | Galvanized Steel | ASME B16.14 | 4638K618 | 00000 | ||
| 2 | 2 7/8" | 0.53" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Galvanized Iron | 40 | Galvanized Steel | 150 | Galvanized Steel | ASME B16.14 | 4638K619 | 00000 | ||
