Locknut Conduit | McMaster-Carr

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	System of Measurement System of Measurement

Metric

	Thread Size Thread Size

	Thread Type Thread Type

NPT

NPSM

Metric

	Type Type	Show

	Locknut

	Type Type	Hide


Conduit	Adapter

Connector	Locknut

Grommet	Bushing

Reducing Washer	Reducing Adapter

Support Clip	Grounding Clamp

Reducer

	Material Material

	Finish Finish

Zinc Plated

	For Conduit Material For Conduit Material

Metal

Plastic

	Specifications Met Specifications Met

CSA

DIN

DIN EN 1.4305

	Conduit Connection Type Conduit Connection Type

	Threaded

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Color Color

	Gray
	Black

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132 Products

About Conduit

Zinc-Plated Steel, 304 Stainless
Steel, 316 Stainless Steel,
Aluminum, and Brass

Zinc-Plated Steel with PVC Molded Gasket

Zinc-Plated Steel with Serrated Facing

Secure threaded metal conduit fittings to a knockout in an outlet box or enclosure.

Zinc-plated steel, 316 stainless steel, and aluminum locknuts are compatible with NPT and NPSM threads.

Locknuts with a PVC molded gasket create a seal for moisture protection.

Locknuts with serrated facing grip the material surface for more stability, compared to locknuts with smooth facing.

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

Zinc-Plated Steel
Thread Size	Specifications Met	Pkg. Qty.		Pkg.
NPSM Threads
1/2	UL Listed, CSA Certified	10	00000000	00000
3/4	UL Listed, CSA Certified	10	00000000	0000
1	UL Listed, CSA Certified	10	00000000	0000
1 1/4	UL Listed, CSA Certified	10	00000000	0000
1 1/2	UL Listed, CSA Certified	10	00000000	0000
2	UL Listed, CSA Certified	10	00000000	00000
				Each
2 1/2	CSA Certified	__	00000000	0000
3	CSA Certified	__	00000000	0000
3 1/2	CSA Certified	__	00000000	0000
4	CSA Certified	__	00000000	0000
				Pkg.
Zinc-Plated Steel with PVC Molded Gasket
NPSM Threads
1/2	UL Listed, CSA Certified	2	00000000	0000
3/4	UL Listed, CSA Certified	2	00000000	0000
1	UL Listed, CSA Certified	2	00000000	0000
1 1/4	UL Listed, CSA Certified	2	00000000	0000
1 1/2	UL Listed, CSA Certified	2	00000000	0000
2	UL Listed, CSA Certified	2	00000000	0000
				Each
2 1/2	CSA Certified	__	00000000	00000
3	CSA Certified	__	00000000	00000
3 1/2	CSA Certified	__	00000000	00000
4	CSA Certified	__	00000000	00000
Zinc-Plated Steel with Serrated Facing
NPSM Threads
1/2	UL Listed, CSA Certified	__	00000000	000
1	UL Listed, CSA Certified	__	00000000	0000
1 1/4	UL Listed, CSA Certified	__	00000000	0000
1 1/2	UL Listed, CSA Certified	__	00000000	0000
2	UL Listed, CSA Certified	__	00000000	0000
2 1/2	CSA Certified	__	00000000	0000
3	CSA Certified	__	00000000	00000
3 1/2	CSA Certified	__	00000000	00000
4	CSA Certified	__	00000000	00000
304 Stainless Steel
PG Threads
PG-7	DIN EN 1.4305	__	00000000	0000
PG-9	DIN EN 1.4305	__	00000000	0000
PG-11	DIN EN 1.4305	__	00000000	00000
PG-13	DIN EN 1.4305	__	00000000	00000
PG-16	DIN EN 1.4305	__	00000000	00000
PG-21	DIN EN 1.4305	__	00000000	00000
PG-29	DIN EN 1.4305	__	00000000	00000
PG-36	DIN EN 1.4305	__	00000000	00000
Metric Threads
M8	DIN EN 1.4305	__	00000000	0000
M10	DIN EN 1.4305	__	00000000	0000
M12	DIN EN 1.4305	__	00000000	0000
M16	DIN EN 1.4305	__	00000000	0000
M20	DIN EN 1.4305	__	00000000	00000
M25	DIN EN 1.4305	__	00000000	00000
M32	DIN EN 1.4305	__	00000000	00000
M40	DIN EN 1.4305	__	00000000	00000
M50	DIN EN 1.4305	__	00000000	00000
316 Stainless Steel
NPSM Threads
1/2	UL Listed, C-UL Listed	__	00000000	0000
3/4	UL Listed, C-UL Listed	__	00000000	0000
1	UL Listed, C-UL Listed	__	00000000	0000
1 1/4	UL Listed, C-UL Listed	__	00000000	00000
1 1/2	UL Listed, C-UL Listed	__	00000000	00000
2	UL Listed, C-UL Listed	__	00000000	00000
2 1/2	UL Listed, C-UL Listed	__	00000000	00000
3	UL Listed, C-UL Listed	__	00000000	00000
4	UL Listed, C-UL Listed	__	00000000	00000
Aluminum
NPSM Threads
1/2	__	__	00000000	0000
3/4	__	__	00000000	0000
1	__	__	00000000	0000
1 1/4	__	__	00000000	0000
1 1/2	__	__	00000000	00000
2	__	__	00000000	00000
2 1/2	__	__	00000000	00000
3	__	__	00000000	00000
4	__	__	00000000	00000
Brass
PG Threads
PG-7	DIN EN 60204	__	00000000	0000
PG-9	DIN EN 60204	__	00000000	0000
PG-11	DIN EN 60204	__	00000000	0000
PG-13.5	DIN EN 60204	__	00000000	0000
PG-16	DIN EN 60204	__	00000000	0000
PG-21	DIN EN 60204	__	00000000	0000
PG-29	DIN EN 60204	__	00000000	0000
PG-36	DIN EN 60204	__	00000000	00000
PG-48	DIN EN 60204	__	00000000	00000
Metric Threads
M12	DIN EN 60204	__	0000000	0000
M16	DIN EN 60204	__	0000000	0000
M20	DIN EN 60204	__	0000000	0000
M25	DIN EN 60204	__	00000000	0000
M32	DIN EN 60204	__	0000000	0000
M40	DIN EN 60204	__	0000000	00000
M50	DIN EN 60204	__	0000000	00000
M63	DIN EN 60204	__	00000000	00000

Locknuts for Plastic Conduit Fittings

Nylon

PVC

Secure threaded plastic conduit fittings to a knockout in an outlet box or enclosure. PVC locknuts are compatible with PVC Schedule 40 and Schedule 80 conduit with NPT and NPSM threads.

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

		Black		Gray
Thread Size	Specifications Met		Each		Each
Nylon
NPT Threads
1/4	__	00000000	00000	00000000	00000
3/8	__	00000000	000	00000000	000
1/2	__	00000000	000	00000000	000
3/4	__	00000000	000	00000000	000
1	__	00000000	0000	00000000	0000
1 1/4	__	00000000	0000	00000000	0000
1 1/2	__	00000000	0000	00000000	0000
2	__	00000000	0000	00000000	0000
PG Threads
PG-7	__	0000000	000	00000000	000
PG-9	__	00000000	0000	00000000	0000
PG-11	__	0000000	0000	00000000	0000
PG-13.5	__	0000000	0000	0000000	0000
PG-16	__	0000000	0000	00000000	0000
PG-21	__	0000000	0000	00000000	0000
PG-29	__	0000000	0000	00000000	0000
PG-36	__	0000000	0000	00000000	0000
PG-48	__	00000000	00000	000000	00
Metric Threads
M12	__	00000000	0000	00000000	0000
M16	__	00000000	0000	00000000	0000
M20	__	0000000	0000	00000000	0000
M25	__	00000000	0000	00000000	0000
M32	__	00000000	0000	00000000	0000
M40	__	00000000	0000	00000000	0000
M50	__	00000000	00000	000000	00
M63	__	00000000	00000	00000000	00000
PVC
NPSM Threads
1/2	UL Recognized Component	000000	00	0000000	000
3/4	UL Recognized Component	000000	00	0000000	000
1	UL Recognized Component	000000	00	0000000	0000

About Conduit

Locknuts for Metal Conduit Fittings

Locknuts for Plastic Conduit Fittings