Galvanized Rigid Conduit (GRC)

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About Conduit

Thick-Wall (Rigid) Steel Conduit

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

Conduit

This impact- and crush-resistant conduit is also known as galvanized rigid conduit (GRC). It has one threaded male end; the other end has a threaded female connector.

5-ft. lengths can be shipped via small-parcel carrier.

5 ft. Lg.
Conduit Trade Size	ID	OD	Pipe Size	Thread Type	Specifications Met	Material		Each
1/2	0.63"	0.84"	1/2	NPT	UL Listed	Galvanized Steel	0000000	000000
3/4	0.84"	1.05"	3/4	NPT	UL Listed	Galvanized Steel	0000000	00000
1	1.06"	1.32"	1	NPT	UL Listed	Galvanized Steel	0000000	00000
1 1/4	1.39"	1.66"	1 1/4	NPT	UL Listed	Galvanized Steel	0000000	000000
1 1/2	1.62"	1.9"	1 1/2	NPT	UL Listed	Galvanized Steel	0000000	000000
2	2.08"	2.38"	2	NPT	UL Listed	Galvanized Steel	0000000	000000
10 ft. Lg.
1/2	0.63"	0.84"	1/2	NPT	UL Listed	Galvanized Steel	0000000	00000
3/4	0.84"	1.05"	3/4	NPT	UL Listed	Galvanized Steel	0000000	00000
1	1.06"	1.32"	1	NPT	UL Listed	Galvanized Steel	0000000	00000
1 1/4	1.39"	1.66"	1 1/4	NPT	UL Listed	Galvanized Steel	0000000	00000
1 1/2	1.62"	1.9"	1 1/2	NPT	UL Listed	Galvanized Steel	0000000	000000
2	2.08"	2.38"	2	NPT	UL Listed	Galvanized Steel	0000000	000000

Straight Adapters—Threaded Conduit Connection × Threaded Electrical Box Connection

Attach medium-wall (IMC) and thick-wall (rigid) steel conduit to a knockout in an outlet box or enclosure.

NPT female × NPSM male straight adapters are also known as hubs. They have an insulated throat to protect wire and cable from abrasion when being pulled. Use in wet or dry locations.

Conduit Connection				Electrical Box Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Material	Includes	Electrical Connector Component		Each
1/2	1/2	NPT	Female	1/2	NPSM	Male	Zinc	Locknut	Adapter	0000000	00000
3/4	3/4	NPT	Female	3/4	NPSM	Male	Zinc	Locknut	Adapter	0000000	00000
1	1	NPT	Female	1	NPSM	Male	Zinc	Locknut	Adapter	0000000	00000
1 1/4	1 1/4	NPT	Female	1 1/4	NPSM	Male	Zinc	Locknut	Adapter	0000000	00000
1 1/2	1 1/2	NPT	Female	1 1/2	NPSM	Male	Zinc	Locknut	Adapter	0000000	00000
2	2	NPT	Female	2	NPSM	Male	Zinc	Locknut	Adapter	0000000	00000

Straight Adapters—Threaded Conduit Connection × Flanged End Electrical Box Connection

Attach medium-wall (IMC) and thick-wall (rigid) steel conduit to a knockout in an outlet box or enclosure.

NPSM male × flanged end male straight adapters are also known as conduit nipples, chase nipples, and box adapters. The flange installs through a knockout from inside an outlet box or enclosure. Use with a locknut (not included) to create a short raceway between boxes or enclosures.

Conduit Connection				Electrical Box Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	For Knockout Trade Size	Gender	Lg.	Material	Electrical Connector Component		Each
1/2	1/2	NPSM	Male	1/2	Male	5/8"	Zinc	Adapter	0000000	00000
3/4	3/4	NPSM	Male	3/4	Male	3/4"	Zinc	Adapter	0000000	0000
1	1	NPSM	Male	1	Male	13/16"	Zinc	Adapter	0000000	0000
1 1/4	1 1/4	NPSM	Male	1 1/4	Male	7/8"	Zinc	Adapter	0000000	0000
1 1/2	1 1/2	NPSM	Male	1 1/2	Male	15/16"	Zinc	Adapter	0000000	0000
2	2	NPSM	Male	2	Male	1"	Zinc	Adapter	0000000	0000

Straight Adapters—Compression Conduit Connection × Threaded Electrical Box Connection

Attach medium-wall (IMC) and thick-wall (rigid) steel conduit to a knockout in an outlet box or enclosure.

Compression female × NPSM male straight adapters offer a reliable hold on conduit.

Conduit Connection		Electrical Box Connection
Conduit Trade Size	Gender	Pipe Size	Thread Type	Gender	Material	Includes	Electrical Connector Component		Each
1/2	Female	1/2	NPSM	Male	Zinc-Plated Steel	Locknut	Adapter	0000000	00000
3/4	Female	3/4	NPSM	Male	Zinc-Plated Steel	Locknut	Adapter	0000000	0000
1	Female	1	NPSM	Male	Zinc-Plated Steel	Locknut	Adapter	0000000	00000
1 1/4	Female	1 1/4	NPSM	Male	Zinc-Plated Steel	Locknut	Adapter	0000000	00000
1 1/2	Female	1 1/2	NPSM	Male	Zinc-Plated Steel	Locknut	Adapter	0000000	00000
2	Female	2	NPSM	Male	Zinc-Plated Steel	Locknut	Adapter	0000000	00000

90° Elbow Adapters—Threaded Conduit Connection × Threaded Electrical Box Connection

Attach medium-wall (IMC) and thick-wall (rigid) steel conduit to a knockout in an outlet box or enclosure.

NPSM female × NPSM male 90° elbow adapters are for tight spaces where conduit can't be bent.

Conduit Connection				Electrical Box Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Material	Electrical Connector Component		Each
1/2	1/2	NPSM	Female	1/2	NPSM	Male	Iron	Adapter	0000000	00000
3/4	3/4	NPSM	Female	3/4	NPSM	Male	Iron	Adapter	0000000	0000
1	1	NPSM	Female	1	NPSM	Male	Iron	Adapter	0000000	00000
1 1/4	1 1/4	NPSM	Female	1 1/4	NPSM	Male	Iron	Adapter	0000000	00000
1 1/2	1 1/2	NPSM	Female	1 1/2	NPSM	Male	Iron	Adapter	0000000	000000
2	2	NPSM	Female	2	NPSM	Male	Iron	Adapter	0000000	000000

Straight Connectors—Compression Conduit Connection

Join pieces of medium-wall (IMC) and thick-wall (rigid) conduit.

Compression female straight connectors join two pieces of unthreaded conduit. Push the conduit into the ends; tighten the compression rings to secure.

Conduit Connection
Conduit Trade Size	Gender	Material		Each
1/2	Female	Zinc-Plated Steel	0000000	00000
3/4	Female	Zinc-Plated Steel	0000000	00000
1	Female	Zinc-Plated Steel	0000000	00000
1 1/4	Female	Zinc-Plated Steel	0000000	00000
1 1/2	Female	Zinc-Plated Steel	0000000	00000
2	Female	Zinc-Plated Steel	0000000	00000

Straight Connectors—Screw-Clamp Conduit Connection

Join pieces of medium-wall (IMC) and thick-wall (rigid) conduit.

Screw-clamp ends tighten around conduit with screws.

Conduit Connection
Conduit Trade Size	Gender	Material	Specifications Met		Each
Connector
1/2	Female	Zinc-Plated Steel	UL Listed	0000000	000000
3/4	Female	Zinc-Plated Steel	UL Listed	0000000	00000
1	Female	Zinc-Plated Steel	UL Listed	0000000	00000
1 1/4	Female	Zinc-Plated Steel	UL Listed	00000000	00000
1 1/2	Female	Zinc-Plated Steel	UL Listed	00000000	00000
2	Female	Zinc-Plated Steel	UL Listed	00000000	00000

Straight Connectors—Threaded Conduit Connection

Connector

Connector with Glide Insert

Join pieces of medium-wall (IMC) and thick-wall (rigid) conduit.

NPT female straight connectors with glide insert have three pieces. The two outer pieces turn independently so you don't need to rotate the conduit.

Conduit Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	Material		Each
Connector
1/2	1/2	NPSM	Female	Galvanized Steel	0000000	00000
3/4	3/4	NPSM	Female	Galvanized Steel	0000000	0000
1	1	NPSM	Female	Galvanized Steel	0000000	0000
1 1/4	1 1/4	NPSM	Female	Galvanized Steel	0000000	0000
1 1/2	1 1/2	NPSM	Female	Galvanized Steel	0000000	0000
2	2	NPSM	Female	Galvanized Steel	0000000	0000
Connector with Glide Insert
1/2	1/2	NPT	Female	Zinc-Plated Iron	0000000	0000
3/4	3/4	NPT	Female	Zinc-Plated Iron	0000000	0000
1	1	NPT	Female	Zinc-Plated Iron	0000000	00000
1 1/4	1 1/4	NPT	Female	Zinc-Plated Iron	0000000	00000
1 1/2	1 1/2	NPT	Female	Zinc-Plated Iron	0000000	00000
2	2	NPT	Female	Zinc-Plated Iron	0000000	00000

Straight Connectors—Threaded Conduit or Electrical Box Connection

Fully Threaded

With Threaded Ends

Join pieces of medium-wall (IMC) and thick-wall (rigid) conduit.

Fully threaded male and male with threaded ends are also known as nipple extensions. They extend the length of conduit or connect two outlet boxes or enclosures.

Conduit or Electrical Box Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	Lg.	Material		Each
Fully Threaded
1/2	1/2	NPT	Male	1 1/8"	Galvanized Steel	0000000	00000
3/4	3/4	NPT	Male	1 3/8"	Galvanized Steel	0000000	0000
1	1	NPT	Male	1 1/2"	Galvanized Steel	0000000	0000
Threaded Ends
1/2	1/2	NPT	Male	3"	Galvanized Steel	0000000	0000
1/2	1/2	NPT	Male	6"	Galvanized Steel	0000000	0000
3/4	3/4	NPT	Male	3"	Galvanized Steel	0000000	0000
3/4	3/4	NPT	Male	6"	Galvanized Steel	0000000	0000
1	1	NPT	Male	3"	Galvanized Steel	0000000	0000
1	1	NPT	Male	6"	Galvanized Steel	0000000	0000

90° Elbow Connectors—Threaded Conduit Connection

With NPT Threads

With NPSM Threads and Removable Cover

Join pieces of medium-wall (IMC) and thick-wall (rigid) conduit.

NPSM female 90° elbow connectors with removable cover allow for quick access to pull wire and cable.

Conduit Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	Lg.	Material	Features		Each
1/2	1/2	NPT	Male	6 3/8"	Galvanized Steel	__	0000000	00000
1/2	1/2	NPSM	Female	__	Zinc	Removable Cover	0000000	00000
3/4	3/4	NPT	Male	6 3/4"	Galvanized Steel	__	0000000	0000
3/4	3/4	NPSM	Female	__	Zinc	Removable Cover	0000000	00000
1	1	NPT	Male	8 1/4"	Galvanized Steel	__	0000000	00000
1	1	NPSM	Female	__	Zinc	Removable Cover	0000000	00000
1 1/4	1 1/4	NPT	Male	9 1/2"	Galvanized Steel	__	0000000	00000
1 1/4	1 1/4	NPSM	Female	__	Zinc	Removable Cover	0000000	00000
1 1/2	1 1/2	NPT	Male	11 1/2"	Galvanized Steel	__	0000000	00000
2	2	NPT	Male	13 1/2"	Galvanized Steel	__	0000000	00000

Offset Elbow Connectors—Threaded Conduit or Electrical Box Connection

Join pieces of medium-wall (IMC) and thick-wall (rigid) conduit.

Offset elbow connectors join knockouts on outlet boxes or enclosures that do not align.

Conduit or Electrical Box Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	Offset Lg.	Material		Each
1/2	1/2	NPSM	Male	3/4"	Zinc	0000000	00000
3/4	3/4	NPSM	Male	3/4"	Zinc	0000000	0000
1	1	NPSM	Male	3/4"	Zinc	0000000	0000
1 1/4	1 1/4	NPSM	Male	3/4"	Zinc	0000000	0000
1 1/2	1 1/2	NPSM	Male	3/4"	Zinc	0000000	0000
2	2	NPSM	Male	3/4"	Zinc	0000000	00000

Grommets

Connect to the end of conduit or a fitting to protect wire and cable from abrasion when being pulled. Use with medium-wall (IMC) and thick-wall (rigid) steel conduit.

Conduit Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	Material	Color		Each
1/2	1/2	NPSM	Female	Polypropylene	Gray	00000000	00000
3/4	3/4	NPSM	Female	Polypropylene	Gray	00000000	000
1	1	NPSM	Female	Polypropylene	Gray	00000000	0000
1 1/4	1 1/4	NPSM	Female	Polypropylene	Gray	00000000	0000
1 1/2	1 1/2	NPSM	Female	Polypropylene	Gray	00000000	0000
2	2	NPSM	Female	Polypropylene	Gray	00000000	0000

Bushings

Join two different sizes of threaded conduit. Use with medium-wall (IMC) and thick-wall (rigid) steel conduit.

Conduit Connection
Conduit Trade Size	Pipe Size	Thread Type	Gender	Material		Each
3/4 × 1/2	3/4 × 1/2	NPSM	Male × Female	Zinc-Plated Steel	0000000	00000
1 × 1/2	1 × 1/2	NPSM	Male × Female	Zinc-Plated Steel	0000000	0000
1 × 3/4	1 × 3/4	NPSM	Male × Female	Zinc-Plated Steel	0000000	0000
1 1/4 × 1/2	1 1/4 × 1/2	NPSM	Male × Female	Zinc-Plated Steel	0000000	0000
1 1/4 × 3/4	1 1/4 × 3/4	NPSM	Male × Female	Zinc-Plated Steel	0000000	0000
1 1/4 × 1	1 1/4 × 1	NPSM	Male × Female	Zinc-Plated Steel	0000000	0000
1 1/2 × 1	1 1/2 × 1	NPSM	Male × Female	Zinc-Plated Steel	0000000	0000
2 × 1/2	2 × 1/2	NPSM	Male × Female	Zinc-Plated Steel	0000000	00000
2 × 3/4	2 × 3/4	NPSM	Male × Female	Zinc-Plated Steel	0000000	00000
2 × 1	2 × 1	NPSM	Male × Female	Zinc-Plated Steel	0000000	00000
2 × 1 1/4	2 × 1 1/4	NPSM	Male × Female	Zinc-Plated Steel	0000000	00000
2 × 1 1/2	2 × 1 1/2	NPSM	Male × Female	Zinc-Plated Steel	0000000	00000

Grounding Clamps

Grounding Clamp

Grounding Clamp With Hinge

Ground conduit by running a ground wire through the attached lug. The included grommet protects wire and cable from abrasion when being pulled. Use with medium-wall (IMC) and thick-wall (rigid) steel conduit.

Grounding clamps with hinge open for quick installation around conduit and secure with a screw.

Grounding Clamp
Conduit Trade Size	Pipe Size	Thread Type	Gender	Material	Compatible With		Each
1/2	1/2	NPSM	Female	Zinc	Aluminum Wire, Copper Wire	00000000	000000
Grounding Clamp with Hinge
3/4	__	__	Female	Zinc	Aluminum Wire, Copper Wire	00000000	00000
1	__	__	Female	Zinc	Aluminum Wire, Copper Wire	00000000	00000
1 1/4	__	__	Female	Zinc	Aluminum Wire, Copper Wire	00000000	00000
1 1/2	__	__	Female	Zinc	Aluminum Wire, Copper Wire	00000000	00000
2	__	__	Female	Zinc	Aluminum Wire, Copper Wire	00000000	00000

Reducing Washers

Reduce the knockout size in an outlet box or enclosure so you can attach a different size of medium-wall (IMC) and thick-wall (rigid) steel conduit to it. Two reducing washers are required per knockout.

Conduit Trade Size	Material	Pkg. Qty.		Pkg.
3/4 × 1/2	Steel	10	00000000	00000
1 × 1/2	Steel	10	00000000	0000
1 × 3/4	Steel	10	00000000	0000
1 1/4 × 1/2	Steel	10	00000000	0000
1 1/4 × 3/4	Steel	10	00000000	0000
1 1/4 × 1	Steel	10	00000000	0000
1 1/2 × 1	Steel	10	00000000	0000
2 × 1/2	Steel	10	00000000	0000
2 × 3/4	Steel	10	00000000	0000
2 × 1	Steel	10	00000000	0000
2 × 1 1/4	Steel	10	00000000	00000
2 × 1 1/2	Steel	10	00000000	00000

Raintight Reducing Washers

Seal out moisture while reducing a knockout size in an outlet box or enclosure. Each includes a washer and a rubber-coated steel gasket.

Conduit Trade Size	Material		Each
3/4 × 1/2	Steel	00000000	00000
1 × 1/2	Steel	00000000	00000
1 × 3/4	Steel	00000000	00000
1 1/4 × 1/2	Steel	00000000	00000
1 1/4 × 3/4	Steel	00000000	00000
1 1/4 × 1	Steel	00000000	00000
2 × 1/2	Steel	00000000	00000