Black Iron Pipe Locknuts

Filter by

System of Measurement

Pipe Size

Thread Type

Material

Flange Material

Length

Hex Width

For Use With

Specifications Met

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

RoHS

REACH

18 Products

About Pipe and Fittings

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 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.

NPTF (Dryseal) threads, NPSC (National Pipe Straight Coupling) threads, and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.

Locknuts

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

NPSL Female
Pipe Size	Material		Each
1/8	Steel	44605K433	00000
1/4	Steel	44605K434	0000
3/8	Iron	44605K211	0000
1/2	Iron	44605K212	0000
3/4	Iron	44605K213	0000
1	Iron	44605K214	00000
1 1/4	Iron	44605K215	0000
1 1/2	Iron	44605K216	00000
2	Iron	44605K217	00000
BSPP Female
1/8	Steel	3555N11	0000
1/4	Steel	3555N12	0000
3/8	Steel	3555N13	0000
1/2	Steel	3555N14	0000
3/4	Steel	3555N15	0000
1	Steel	3555N16	00000
1 1/4	Steel	3555N17	00000
1 1/2	Steel	3555N18	00000
2	Steel	3555N19	00000

Low-Pressure Iron and SteelThreaded Pipe Fittings

Low-Pressure Iron and Steel
Threaded Pipe Fittings