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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 Stainless Steel Threaded Pipe Locknuts
 |
Use these locknuts in a low-pressure pipe line.
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 and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
304 Stainless Steel—304 stainless steel locknuts have very good corrosion resistance.
316 Stainless Steel—316 stainless steel locknuts have excellent corrosion resistance.
ANSI/MSS SP-114—Locknuts that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking.
DIN 431—Locknuts that meet DIN 431 comply with international standards for pipe locknut dimensions.
For Pipe | For Flange | 304 Stainless Steel | 316 Stainless Steel | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Max. Pressure @ Temp. | Max. Steam Pressure @ Temp. | For Use With | Pressure Class | Fabrication | Schedule | Material | Class | Material | Specs. Met | Each | Each | ||||
NPSL Female | ||||||||||||||||
| 1/8 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K581 | 00000 | ——— | 0 | ||
| 1/8 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K671 | 00000 | ||
| 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K582 | 0000 | ——— | 0 | ||
| 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K672 | 0000 | ||
| 3/8 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K583 | 00000 | ——— | 0 | ||
| 3/8 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K673 | 00000 | ||
| 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K584 | 00000 | ——— | 0 | ||
| 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K674 | 00000 | ||
| 3/4 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K585 | 00000 | ——— | 0 | ||
| 3/4 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K675 | 00000 | ||
| 1 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K586 | 00000 | ——— | 0 | ||
| 1 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K676 | 00000 | ||
| 1 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K587 | 00000 | ——— | 0 | ||
| 1 1/4 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K677 | 00000 | ||
| 1 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K588 | 00000 | ——— | 0 | ||
| 1 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K678 | 00000 | ||
| 2 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K589 | 00000 | ——— | 0 | ||
| 2 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K679 | 00000 | ||
| 2 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K591 | 00000 | ——— | 0 | ||
| 2 1/2 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K681 | 00000 | ||
| 3 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K592 | 00000 | ——— | 0 | ||
| 3 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K682 | 00000 | ||
| 4 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 304 Stainless Steel, 304/304L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | 4464K593 | 00000 | ——— | 0 | ||
| 4 | 300 psi @ 72° F | 150 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 150 | Heat Treated | 40 | 316 Stainless Steel, 316/316L Stainless Steel | 150 | 304 Stainless Steel, 304/304L Stainless Steel | ANSI/MSS SP-114, ASTM A351 | ——— | 0 | 4452K683 | 00000 | ||
BSPP Female | ||||||||||||||||
| 1/8 | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | — | — | 304 Stainless Steel, 304/304L Stainless Steel | — | 304 Stainless Steel, 304/304L Stainless Steel | DIN 431 | 9027N101 | 0000 | ——— | 0 | ||
| 1/4 | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | — | — | 304 Stainless Steel, 304/304L Stainless Steel | — | 304 Stainless Steel, 304/304L Stainless Steel | DIN 431 | 9027N102 | 0000 | ——— | 0 | ||
| 3/8 | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | — | — | 304 Stainless Steel, 304/304L Stainless Steel | — | 304 Stainless Steel, 304/304L Stainless Steel | DIN 431 | 9027N103 | 0000 | ——— | 0 | ||
| 1/2 | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | — | — | 304 Stainless Steel, 304/304L Stainless Steel | — | 304 Stainless Steel, 304/304L Stainless Steel | DIN 431 | 9027N104 | 0000 | ——— | 0 | ||
| 5/8 | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | — | — | 304 Stainless Steel, 304/304L Stainless Steel | — | 304 Stainless Steel, 304/304L Stainless Steel | DIN 431 | 9027N105 | 0000 | ——— | 0 | ||
| 3/4 | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | — | — | 304 Stainless Steel, 304/304L Stainless Steel | — | 304 Stainless Steel, 304/304L Stainless Steel | DIN 431 | 9027N106 | 0000 | ——— | 0 | ||
| 1 | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | — | — | — | 304 Stainless Steel, 304/304L Stainless Steel | — | 304 Stainless Steel, 304/304L Stainless Steel | DIN 431 | 9027N107 | 00000 | ——— | 0 | ||
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 | |||
NPT Female | |||||||||||||||
| 3 | 4 1/4" | 11/16" | 175 psi @ 72° F | 125 psi @ 350° F | Air, Natural Gas, Oil, Steam, Water | 125 | Iron | 40 | Steel | Iron, Steel | ASME B1.20.1, ASME B16.4 | 44605K488 | 000000 | ||
NPSL Female | |||||||||||||||
| 1/8 | 11/16" | 3/16" | Not Rated | Not Rated | Air, Natural Gas, Oil, Steam, Water | 150 | Steel | 40 | Steel | Iron, Steel | ASME B16.14 | 44605K433 | 0000 | ||
| 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 | 0000 | ||
| 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 | ||
Low-Pressure Plated Brass Threaded Pipe Locknuts
 |
Used in low-pressure pipe lines, these brass locknuts have a plating that makes them shiny and improves corrosion resistance.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
Chrome-Plated Brass—Chrome-plated brass locknuts are shinier and withstand corrosion better than nickel-plated brass locknuts.
For Pipe | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pipe Size | Hex Wd. | Lg. | Max. Pressure @ Temp. | Max. Steam Pressure @ Temp. | For Use With | Pressure Class | Material | Schedule | Material | Specs. Met | Each | |||
NPT Female | ||||||||||||||
| 1/8 | 7/8" | 1/4" | 200 psi @ 72° F | 125 psi @ 400° F | Air, Natural Gas, Oil, Steam, Water | 125 | Chrome-Plated Brass | 40 | Brass | ASTM B456 | 9162K181 | 000000 | ||
| 1/4 | 7/8" | 1/4" | 200 psi @ 72° F | 125 psi @ 400° F | Air, Natural Gas, Oil, Steam, Water | 125 | Chrome-Plated Brass | 40 | Brass | ASTM B456 | 9162K182 | 00000 | ||
| 3/8 | 1" | 9/32" | 200 psi @ 72° F | 125 psi @ 400° F | Air, Natural Gas, Oil, Steam, Water | 125 | Chrome-Plated Brass | 40 | Brass | ASTM B456 | 9162K183 | 00000 | ||
| 1/2 | 1 9/32" | 5/16" | 200 psi @ 72° F | 125 psi @ 400° F | Air, Natural Gas, Oil, Steam, Water | 125 | Chrome-Plated Brass | 40 | Brass | ASTM B456 | 9162K184 | 00000 | ||
| 3/4 | 1 1/2" | 9/32" | 200 psi @ 72° F | 125 psi @ 400° F | Air, Natural Gas, Oil, Steam, Water | 125 | Chrome-Plated Brass | 40 | Brass | ASTM B456 | 9162K185 | 00000 | ||
| 1 | 1 3/4" | 11/32" | 200 psi @ 72° F | 125 psi @ 400° F | Air, Natural Gas, Oil, Steam, Water | 125 | Chrome-Plated Brass | 40 | Brass | ASTM B456 | 9162K186 | 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
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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 | ||
