1 1/2 Pipe Size Pipe Locknuts

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17 Products

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.

							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 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	000000	———	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	000000

Conduit Locknuts

Secure threaded conduit fittings to knockouts. These locknuts keep fittings from shifting, so connections stay stable and wiring is protected inside electrical boxes or enclosures.

For Metal and Plastic Fittings


	Locknut with PVC Molded Gasket

Locknut with Serrated Facing

Zinc-Plated Steel—The strength of steel with a plating that protects from occasional exposure to moisture.

316 Stainless Steel—Our most corrosion-resistant fittings won't degrade when exposed to salt water and harsh chemicals.

Aluminum—One-third the weight of steel that's the same size. Aluminum is also nonmagnetic to prevent electrical interference in nearby equipment.

PVC Molded Gasket—Creates a seal for moisture protection.

Serrated Facing—Grips the material surface for added stability.

	Pkg. Qty.		Pkg.
NPSM Thread







	Zinc-Plated Steel

	1 1/2	—	CSA Certified, UL Listed	10	7513K245	000000


	1 1/2	PVC Molded Gasket	CSA Certified, UL Listed	2	7513K315	0000
	1 1/2	Serrated Facing	CSA Certified, UL Listed	1	7513K123	0000




			Aluminum

			1 1/2	—	—	1	9147T127	00000


			NPSL Thread







							316 Stainless Steel

							1 1/2	—	C-UL Listed, UL Listed	1	7513K412	00000

For Plastic Fittings

Nylon—Lightweight and chemical resistant, these fittings won't corrode.


NPT Thread







	Nylon

	1 1/2	3185K116	00000


	1 1/2	7877N108	0000

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 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	000000


		BSPP Female



				1 1/2	60 mm	12 mm	Not Rated	Not Rated	Air, Natural Gas, Oil, Steam, Water	—	Steel	—	Steel	Steel	DIN 431	3555N18	00000

Low-Pressure Brass and Bronze Threaded Pipe Locknuts

Use these locknuts 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.

NPSL Thread—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.

NSF/ANSI 61—Locknuts rated for use with drinking water meet NSF/ANSI 61 safety standards.

								For Pipe		For Flange
	Pipe Size	Hex Wd.	Lg.	Max. Pressure @ Temp.	For Use With	Pressure Class	Material	Schedule	Material	Class	Material	Specs. Met	Food Industry Std.		Each
NPSL Female



		1 1/2	2 11/32"	15/32"	200 psi @ 72° F	Air, Drinking Water, Natural Gas, Oil	125	Brass	40	Brass	150	Brass	ASME B1.20.1, ASME B16.15, ASTM A584	NSF/ANSI 61	4429K128	000000


		BSPP Female



				1 1/2	60 mm	12 mm	Not Rated	Air, Natural Gas, Oil	—	Brass	—	Brass	—	Brass	DIN 431	—	3538N18	00000

Extreme-Pressure Stainless Steel Threaded Pipe Locknuts

With the strength to handle extreme pressures, these locknuts can be used to connect equipment in hydraulic fluid lines.

Locknuts have a gasket, which creates a tight seal without the need for PTFE tape; screw one onto the male end of a fitting for extra holding power.

303 Stainless Steel—303 stainless steel locknuts have very good corrosion resistance.

									303 Stainless Steel
	Pipe Size	Dash Size	Hex Wd.	Lg.	Gasket Material	Max. Pressure @ Temp.	For Use With	Temp. Range, ° F		Each
NPT Female



		1 1/2	24	2 1/4"	25/64"	PTFE	3,000 psi @ 72° F	Air, Hydraulic Fluid, Natural Gas, Oil, Water	-300 to 500	5530K48	0000000

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 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	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 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	000000

Low-Pressure Aluminum Threaded Pipe Locknuts

In addition to being lightweight, these aluminum locknuts offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a _1/4-turn past hand tight.

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.	For Use With	Pressure Class	Material	Schedule	Material	Class	Material		Each
NPSL Female



		1 1/2	2 3/4"	1/2"	150 psi @ 72° F	Air, Oil, Water	150	356 Aluminum	40	Aluminum	125	Aluminum	44705K418	000000