ASTM A584 Pipe Locknuts | McMaster-Carr

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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.

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Use these fittings in low-pressure flow applications. They have good corrosion resistance. Fittings rated for use with drinking water meet NSF/ANSI 61 safety standards.

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.

NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.

For technical drawings and 3-D models, click on a part number.

Locknuts

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	Pressure Class	Material	Schedule	Material	Class	Material	For Use With	Specifications Met		Each
NPSL Female
1/8	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
1/4	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
3/8	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
1/2	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
3/4	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
1	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
1 1/4	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
1 1/2	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
2	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000