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About Conduit
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Thick-Wall (Rigid) Steel Conduit
For technical drawings and 3-D models, click on a part number.

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

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 | Thread Size | Thread Type | Gender | Thread Size | Thread Type | Gender | Material | Includes | Each | |
1/2 | 1/2 | NPT | Female | 1/2 | NPSM | Male | Zinc | Locknut | 0000000 | 00000 |
3/4 | 3/4 | NPT | Female | 3/4 | NPSM | Male | Zinc | Locknut | 0000000 | 00000 |
1 | 1 | NPT | Female | 1 | NPSM | Male | Zinc | Locknut | 0000000 | 00000 |
1 1/4 | 1 1/4 | NPT | Female | 1 1/4 | NPSM | Male | Zinc | Locknut | 0000000 | 00000 |
1 1/2 | 1 1/2 | NPT | Female | 1 1/2 | NPSM | Male | Zinc | Locknut | 0000000 | 00000 |
2 | 2 | NPT | Female | 2 | NPSM | Male | Zinc | Locknut | 0000000 | 00000 |

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 | Thread Size | Thread Type | Gender | For Knockout Trade Size | Gender | Lg. | Material | Each | |
1/2 | 1/2 | NPSM | Male | 1/2 | Male | 5/8" | Zinc | 0000000 | 00000 |
3/4 | 3/4 | NPSM | Male | 3/4 | Male | 3/4" | Zinc | 0000000 | 0000 |
1 | 1 | NPSM | Male | 1 | Male | 13/16" | Zinc | 0000000 | 0000 |
1 1/4 | 1 1/4 | NPSM | Male | 1 1/4 | Male | 7/8" | Zinc | 0000000 | 0000 |
1 1/2 | 1 1/2 | NPSM | Male | 1 1/2 | Male | 15/16" | Zinc | 0000000 | 0000 |
2 | 2 | NPSM | Male | 2 | Male | 1" | Zinc | 0000000 | 0000 |

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 | Thread Size | Thread Type | Gender | Material | Includes | Each | |
1/2 | Female | 1/2 | NPSM | Male | Zinc-Plated Steel | Locknut | 0000000 | 00000 |
3/4 | Female | 3/4 | NPSM | Male | Zinc-Plated Steel | Locknut | 0000000 | 0000 |
1 | Female | 1 | NPSM | Male | Zinc-Plated Steel | Locknut | 0000000 | 00000 |
1 1/4 | Female | 1 1/4 | NPSM | Male | Zinc-Plated Steel | Locknut | 0000000 | 00000 |
1 1/2 | Female | 1 1/2 | NPSM | Male | Zinc-Plated Steel | Locknut | 0000000 | 00000 |
2 | Female | 2 | NPSM | Male | Zinc-Plated Steel | Locknut | 0000000 | 00000 |

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 Type | ||||||||
---|---|---|---|---|---|---|---|---|---|
Conduit Trade Size | Thread Size | Thread Type | Gender | Thread Size | Thread Type | Gender | Material | Each | |
1/2 | 1/2 | NPSM | Female | 1/2 | NPSM | Male | Iron | 0000000 | 00000 |
3/4 | 3/4 | NPSM | Female | 3/4 | NPSM | Male | Iron | 0000000 | 0000 |
1 | 1 | NPSM | Female | 1 | NPSM | Male | Iron | 0000000 | 00000 |
1 1/4 | 1 1/4 | NPSM | Female | 1 1/4 | NPSM | Male | Iron | 0000000 | 00000 |
1 1/2 | 1 1/2 | NPSM | Female | 1 1/2 | NPSM | Male | Iron | 0000000 | 000000 |
2 | 2 | NPSM | Female | 2 | NPSM | Male | Iron | 0000000 | 000000 |

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.


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 | Thread 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 |


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 | Thread Size | Thread Type | Gender | Lg. | Material | Each | |
Fully Threaded | |||||||
1/2 | 1/2 | NPT | Male | 1 1/8" | Zinc-Plated Steel | 0000000 | 00000 |
3/4 | 3/4 | NPT | Male | 1 3/8" | Zinc-Plated Steel | 0000000 | 0000 |
1 | 1 | NPT | Male | 1 1/2" | Zinc-Plated Steel | 0000000 | 0000 |
Threaded Ends | |||||||
1/2 | 1/2 | NPT | Male | 3" | Zinc-Plated Steel | 0000000 | 0000 |
1/2 | 1/2 | NPT | Male | 6" | Zinc-Plated Steel | 0000000 | 0000 |
3/4 | 3/4 | NPT | Male | 3" | Zinc-Plated Steel | 0000000 | 0000 |
3/4 | 3/4 | NPT | Male | 6" | Zinc-Plated Steel | 0000000 | 0000 |
1 | 1 | NPT | Male | 3" | Zinc-Plated Steel | 0000000 | 0000 |
1 | 1 | NPT | Male | 6" | Zinc-Plated Steel | 0000000 | 0000 |


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 | Thread Size | Thread Type | Gender | Lg. | Material | Features | Each | |
1/2 | 1/2 | NPT | Male | 6 1/8" | Galvanized Steel | __ | 0000000 | 00000 |
1/2 | 1/2 | NPSM | Female | __ | Zinc | Removable Cover | 0000000 | 00000 |
3/4 | 3/4 | NPT | Male | 7 1/8" | Galvanized Steel | __ | 0000000 | 0000 |
3/4 | 3/4 | NPSM | Female | __ | Zinc | Removable Cover | 0000000 | 00000 |
1 | 1 | NPT | Male | 9" | Galvanized Steel | __ | 0000000 | 00000 |
1 | 1 | NPSM | Female | __ | Zinc | Removable Cover | 0000000 | 00000 |
1 1/4 | 1 1/4 | NPT | Male | 11" | 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 | 12 1/2" | Galvanized Steel | __ | 0000000 | 00000 |
2 | 2 | NPT | Male | 14 1/4" | Galvanized Steel | __ | 0000000 | 00000 |

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 | Thread 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 |

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 | Thread 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 | 000 |
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 |

Join two different sizes of threaded conduit. Use with medium-wall (IMC) and thick-wall (rigid) steel conduit.
Conduit Connection | ||||||
---|---|---|---|---|---|---|
Conduit Trade Size | Thread 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 |


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.
Conduit Trade Size | Thread Size | Thread Type | Gender | Material | Compatible With | Each | |
Grounding Clamp | |||||||
---|---|---|---|---|---|---|---|
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 |

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 | 0000 |
2 × 1 1/2 | Steel | 10 | 00000000 | 0000 |