Reducing Washers | McMaster-Carr

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Conduit Trade Size

Fitting Type

Conduit Type

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Environment

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

Yes

DFARS Specialty Metals

Flexibility

REACH

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For Conduit Flexibility

Rigid

Export Control Classification Number (ECCN)

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19 Products

About Conduit

Compare rigid and flexible conduit materials and identify the trade size for compatible fittings.

Medium-Wall (IMC) and Thick-Wall (RMC) Metal Conduit and Fittings

The industry standards, IMC and RMC conduit systems offer the most durable protection indoors, outdoors, and underground. Both types have the same outside diameter, so they use many of the same fittings. This interchangeability makes retrofits easier and reduces the parts you need to keep on hand.

Reducing Washers

Shrink the size of knockouts in an electrical box so you can connect smaller sizes of conduit.

Galvanized Steel—These washers resist rust in wet environments and are used in pairs. Install one washer inside the box and one on the outside.

Galvanized Steel with Rubber-Coated Steel Gasket—These rust-resistant washers are paired with a gasket to block out moisture. The washer goes inside the box and the gasket on the outside to create the seal.

	For Conduit Type	Specs. Met	Pkg. Qty.		Pkg.
Galvanized Steel



	3/4 × 1/2	IMC, RMC	CSA Certified, UL Listed	10	7513K371	00000


	1 × 1/2	IMC, RMC	C-UL Listed, CSA Certified, UL Listed	10	7513K372	0000
	1 × 3/4	IMC, RMC	C-UL Listed, CSA Certified, UL Listed	10	7513K373	0000
	1 1/4 × 1/2	IMC, RMC	C-UL Listed, CSA Certified, UL Listed	10	7513K374	0000
	1 1/4 × 3/4	IMC, RMC	C-UL Listed, CSA Certified, UL Listed	10	7513K375	0000
	1 1/4 × 1	IMC, RMC	C-UL Listed, CSA Certified, UL Listed	10	7513K376	0000
	1 1/2 × 1	IMC, RMC	C-UL Listed, CSA Certified, UL Listed	10	7513K383	0000
	2 × 1/2	IMC, RMC	CSA Certified, UL Listed	10	7513K377	00000
	2 × 3/4	IMC, RMC	CSA Certified, UL Listed	10	7513K378	00000
	2 × 1	IMC, RMC	CSA Certified, UL Listed	10	7513K379	00000
	2 × 1 1/4	IMC, RMC	CSA Certified, UL Listed	10	7513K381	00000


	2 × 1 1/2	IMC, RMC	CSA Certified, UL Listed	10	7513K382	00000


	Galvanized Steel with Rubber-Coated Steel Gasket



			3/4 × 1/2	IMC, RMC	C-UL Listed, UL Listed, ANSI/NEMA FB 1	1	7513K221	0000


			1 × 1/2	IMC, RMC	C-UL Listed, UL Listed, ANSI/NEMA FB 1	1	7513K222	00000
			1 × 3/4	IMC, RMC	C-UL Listed, UL Listed, ANSI/NEMA FB 1	1	7513K223	00000
			1 1/4 × 1/2	IMC, RMC	C-UL Listed, UL Listed, ANSI/NEMA FB 1	1	7513K904	00000
			1 1/4 × 3/4	IMC, RMC	C-UL Listed, UL Listed, ANSI/NEMA FB 1	1	7513K224	00000
			1 1/4 × 1	IMC, RMC	C-UL Listed, UL Listed, ANSI/NEMA FB 1	1	7513K905	00000
			2 × 1/2	IMC, RMC	C-UL Listed, UL Listed, ANSI/NEMA FB 1	1	7513K225	00000