About Conduit
More
About Nuts, Materials, and Finishes
More
Locknuts for Metal Conduit Fittings
316 Stainless
Steel, and Aluminum
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 NPSL 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.
| Pipe Size  | Thread Size | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||
|---|---|---|---|---|---|
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 1/2 | __ | UL Listed, CSA Certified | 10 | 00000000 | 00000 |
| 1 1/4 | __ | 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 1/2 | __ | UL Listed, CSA Certified | 2 | 00000000 | 0000 |
| 1 1/4 | __ | UL Listed, CSA Certified | 2 | 00000000 | 0000 |
| 2 | __ | UL Listed, CSA Certified | 2 | 00000000 | 00000 |
| 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 | 0000 |
| 3/4 | __ | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 1 | __ | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 1 1/2 | __ | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 1 1/4 | __ | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 2 | __ | UL Listed, CSA Certified | __ | 00000000 | 0000 |
| 2 1/2 | __ | CSA Certified | __ | 00000000 | 00000 |
| 3 | __ | CSA Certified | __ | 00000000 | 00000 |
| 4 | __ | CSA Certified | __ | 00000000 | 00000 |
304 Stainless Steel | |||||
PG Threads | |||||
| __ | PG-7 | __ | __ | 00000000 | 0000 |
| __ | PG-9 | __ | __ | 00000000 | 0000 |
| __ | PG-11 | __ | __ | 00000000 | 00000 |
| __ | PG-13.5 | __ | __ | 00000000 | 00000 |
| __ | PG-16 | __ | __ | 00000000 | 00000 |
| __ | PG-21 | __ | __ | 00000000 | 00000 |
| __ | PG-29 | __ | __ | 00000000 | 00000 |
| __ | PG-36 | __ | __ | 00000000 | 00000 |
Metric Threads | |||||
| __ | M8 | __ | __ | 00000000 | 0000 |
| __ | M12 | __ | __ | 00000000 | 0000 |
| __ | M16 | __ | __ | 00000000 | 0000 |
| __ | M20 | __ | __ | 00000000 | 00000 |
| __ | M25 | __ | __ | 00000000 | 00000 |
| __ | M32 | __ | __ | 00000000 | 00000 |
| __ | M40 | __ | __ | 00000000 | 00000 |
| __ | M50 | __ | __ | 00000000 | 00000 |
| __ | M63 | __ | __ | 00000000 | 00000 |
316 Stainless Steel | |||||
NPSL | |||||
| 1/2 | __ | UL Listed, C-UL Listed | __ | 00000000 | 00000 |
| 3/4 | __ | UL Listed, C-UL Listed | __ | 00000000 | 00000 |
| 1 | __ | UL Listed, C-UL Listed | __ | 00000000 | 00000 |
| 1 1/2 | __ | UL Listed, C-UL Listed | __ | 00000000 | 00000 |
| 1 1/4 | __ | UL Listed, C-UL Listed | __ | 00000000 | 00000 |
| 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 1/2 | __ | __ | __ | 00000000 | 0000 |
| 1 1/4 | __ | __ | __ | 00000000 | 0000 |
| 2 | __ | __ | __ | 00000000 | 00000 |
Brass | |||||
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
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 | Pipe 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 | 0000 |
| __ | 3/4 | __ | 00000000 | 0000 | 00000000 | 0000 |
| __ | 1 | __ | 00000000 | 0000 | 00000000 | 0000 |
| __ | 1 1/2 | __ | 00000000 | 0000 | 00000000 | 0000 |
| __ | 1 1/4 | __ | 00000000 | 0000 | 00000000 | 0000 |
| __ | 2 | __ | 00000000 | 00000 | 00000000 | 00000 |
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 | 00000 | 00000000 | 00000 |
| 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 | 0000 |
| __ | 1 | UL Recognized Component | 000000 | 00 | 0000000 | 0000 |
Stainless Steel Hex Panel Nuts
All of these stainless steel panel nuts have some chemical resistance. They can be fastened with a wrench for more torque while tightening than knurled panel nuts. Also known as dress nuts, they are extremely thin for use in tight spaces such as electrical panels.
18-8 stainless steel nuts have good chemical resistance. They may be mildly magnetic. Those with a black-oxide finish have a dark surface color.
316 stainless steel nuts have excellent chemical resistance and can be used in saltwater environments.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||
|---|---|---|---|---|---|
| 1/8 | 9/16" | 1/8" | 1 | 000000000 | 00000 |
| 1/8 | 5/8" | 1/8" | 1 | 000000000 | 0000 |
| 1/8 | 5/8" | 3/16" | 1 | 000000000 | 0000 |
| 1/4 | 11/16" | 1/4" | 1 | 000000000 | 0000 |
| 1/4 | 11/16" | 9/32" | 1 | 000000000 | 0000 |
| 3/8 | 13/16" | 17/64" | 1 | 000000000 | 0000 |
| 1/2 | 1" | 21/64" | 1 | 000000000 | 0000 |
| 1/2 | 1" | 11/32" | 1 | 000000000 | 00000 |
316 Stainless Steel | |||||
| 1/8 | 5/8" | 1/8" | 1 | 000000000 | 0000 |
| 1/8 | 5/8" | 3/16" | 1 | 000000000 | 0000 |
| 1/4 | 11/16" | 1/4" | 1 | 000000000 | 00000 |
| 1/4 | 11/16" | 17/64" | 1 | 000000000 | 00000 |
| 3/8 | 13/16" | 17/64" | 1 | 000000000 | 00000 |
| 1/2 | 1" | 21/64" | 1 | 000000000 | 00000 |
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||
|---|---|---|---|---|---|
| 1/4"-32 | 5/16" | 5/64" | 10 | 000000000 | 000000 |
| 1/4"-32 | 3/8" | 3/32" | 10 | 000000000 | 0000 |
| 5/16"-32 | 3/8" | 3/32" | 1 | 000000000 | 0000 |
| 5/16"-32 | 7/16" | 7/64" | 10 | 000000000 | 00000 |
| 5/16"-32 | 1/2" | 17/64" | 1 | 000000000 | 0000 |
| 3/8"-32 | 1/2" | 3/32" | 1 | 000000000 | 0000 |
| 3/8"-32 | 9/16" | 21/64" | 1 | 000000000 | 0000 |
| 3/8"-32 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 7/16"-28 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 7/16"-28 | 11/16" | 3/8" | 1 | 000000000 | 0000 |
| 15/32"-32 | 9/16" | 5/64" | 1 | 000000000 | 0000 |
| 15/32"-32 | 9/16" | 3/32" | 1 | 000000000 | 0000 |
| 15/32"-32 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 15/32"-32 | 5/8" | 9/16" | 1 | 000000000 | 0000 |
| 1/2"-28 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 1/2"-28 | 5/8" | 1/8" | 1 | 000000000 | 0000 |
| 11/16"-24 | 1" | 27/64" | 1 | 000000000 | 00000 |
| 3/4"-20 | 1" | 27/64" | 1 | 000000000 | 00000 |
Black-Oxide 18-8 Stainless Steel | |||||
| 5/16"-32 | 7/16" | 7/64" | 5 | 000000000 | 00000 |
| 3/8"-32 | 1/2" | 3/32" | 1 | 000000000 | 0000 |
| 7/16"-28 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 15/32"-32 | 5/8" | 9/16" | 1 | 000000000 | 0000 |
| 1/2"-28 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 5/8"-24 | 15/16" | 3/8" | 1 | 000000000 | 0000 |
| 11/16"-24 | 1" | 27/64" | 1 | 000000000 | 00000 |
| 3/4"-20 | 1" | 27/64" | 1 | 000000000 | 0000 |
316 Stainless Steel | |||||
| 1/4"-32 | 5/16" | 5/64" | 1 | 000000000 | 0000 |
| 5/16"-32 | 3/8" | 3/32" | 1 | 000000000 | 00000 |
| 3/8"-32 | 1/2" | 3/32" | 1 | 000000000 | 00000 |
| 7/16"-28 | 5/8" | 3/32" | 1 | 000000000 | 00000 |
| 15/32"-32 | 5/8" | 9/16" | 1 | 000000000 | 00000 |
| 1/2"-28 | 5/8" | 1/8" | 1 | 000000000 | 00000 |
| 5/8"-24 | 15/16" | 3/8" | 1 | 000000000 | 00000 |
| 11/16"-24 | 1" | 27/64" | 1 | 000000000 | 00000 |
| 3/4"-20 | 1" | 27/64" | 1 | 000000000 | 00000 |
| 7/8"-20 | 1 5/16" | 31/64" | 1 | 000000000 | 00000 |
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | |||||
|---|---|---|---|---|---|
| 1/4"-40 | 5/16" | 1/16" | 1 | 000000000 | 00000 |
| 1/4"-40 | 5/8" | 3/16" | 1 | 000000000 | 0000 |
| 5/8"-27 | 3/4" | 1/8" | 1 | 000000000 | 0000 |
Black-Oxide 18-8 Stainless Steel | |||||
| 1/4"-40 | 5/8" | 3/16" | 1 | 000000000 | 0000 |
| 5/8"-27 | 3/4" | 1/8" | 1 | 000000000 | 0000 |
316 Stainless Steel | |||||
| 1/4"-40 | 5/8" | 3/16" | 1 | 000000000 | 0000 |
| 5/8"-27 | 3/4" | 1/8" | 1 | 000000000 | 0000 |
Steel Hex Panel Nuts
Fasten these panel nuts with a wrench for more torque while tightening than knurled panel nuts. Also known as dress nuts, they're extremely thin for use in tight spaces such as electrical panels.
Zinc-plated steel nuts resist corrosion in wet environments.
Black-oxide steel nuts have a dark surface color.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||
|---|---|---|---|---|---|
| 1/4"-32 | 5/16" | 5/64" | 10 | 000000000 | 000000 |
| 1/4"-32 | 3/8" | 3/32" | 10 | 000000000 | 0000 |
| 5/16"-32 | 7/16" | 7/64" | 10 | 000000000 | 00000 |
| 3/8"-32 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 7/16"-28 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 15/32"-32 | 9/16" | 5/64" | 1 | 000000000 | 0000 |
| 15/32"-32 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 15/32"-32 | 5/8" | 9/16" | 1 | 000000000 | 0000 |
| 1/2"-28 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
Black-Oxide Steel | |||||
| 3/8"-32 | 1/2" | 3/32" | 1 | 000000000 | 0000 |
| 7/16"-28 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 1/2"-28 | 5/8" | 3/32" | 1 | 000000000 | 0000 |
| 1/2"-28 | 5/8" | 1/8" | 1 | 000000000 | 0000 |
| 1/2"-28 | 3/4" | 3/8" | 1 | 000000000 | 00000 |
| 5/8"-24 | 15/16" | 3/8" | 1 | 000000000 | 00000 |
| 11/16"-24 | 1" | 27/64" | 1 | 000000000 | 00000 |
| 3/4"-20 | 1" | 27/64" | 1 | 000000000 | 00000 |
| 7/8"-20 | 1 5/16" | 31/64" | 1 | 000000000 | 00000 |
Brass Hex Panel Nuts
These panel nuts are corrosion resistant in wet environments, electrically conductive, and nonmagnetic. They can be fastened with a wrench for more torque while tightening than knurled panel nuts. Also known as dress nuts, they're extremely thin for use in tight spaces such as electrical panels.
Nickel-plated brass panel nuts have excellent resistance to chemicals and salt water.
For technical drawings and 3-D models, click on a part number.
UNEF Threads
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Knurled Panel Nuts
These panel nuts are knurled to provide a secure grip for tightening and loosening by hand. Also known as dress nuts, they're extremely thin for use in tight spaces such as electrical panels. They're zinc plated to resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.