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About Nuts, Materials, and Finishes
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Low-Strength Steel Coupling Nuts
Also known as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.
Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
Each | |||||
|---|---|---|---|---|---|
| Thread Size | Lg. | Wd. | 1-9 | 10-Up | |
Black-Oxide Steel | |||||
| 10-24 | 3/4" | 5/16" | 000000000 | 00000 | 00000 |
| 1/4"-20 | 5/8" | 1/2" | 000000000 | 0000 | 0000 |
| 1/4"-20 | 7/8" | 3/8" | 000000000 | 0000 | 000 |
| 5/16"-18 | 7/8" | 9/16" | 000000000 | 0000 | 0000 |
| 5/16"-18 | 1 1/8" | 1/2" | 000000000 | 0000 | 0000 |
| 3/8"-16 | 1" | 11/16" | 000000000 | 0000 | 0000 |
| 3/8"-16 | 1 3/4" | 5/8" | 000000000 | 0000 | 0000 |
| 7/16"-14 | 1 1/4" | 3/4" | 000000000 | 0000 | 0000 |
| 7/16"-14 | 1 3/4" | 5/8" | 000000000 | 0000 | 0000 |
| 1/2"-13 | 1 1/4" | 7/8" | 000000000 | 0000 | 0000 |
| 1/2"-13 | 1 3/4" | 11/16" | 000000000 | 0000 | 0000 |
| 5/8"-11 | 1 5/8" | 1 1/16" | 000000000 | 0000 | 0000 |
| 5/8"-11 | 2 1/8" | 13/16" | 000000000 | 0000 | 0000 |
| 3/4"-10 | 1 7/8" | 1 1/4" | 000000000 | 0000 | 0000 |
| 3/4"-10 | 2 1/4" | 1" | 000000000 | 0000 | 0000 |
| 7/8"-9 | 2 1/4" | 1 7/16" | 000000000 | 00000 | 0000 |
| 7/8"-9 | 2 1/2" | 1 1/4" | 000000000 | 00000 | 00000 |
| 1"-8 | 2 1/2" | 1 1/4" | 000000000 | 00000 | 00000 |
| 1"-8 | 2 1/2" | 1 5/8" | 000000000 | 00000 | 00000 |
| 1 1/4"-7 | 3" | 1 5/8" | 000000000 | 00000 | 00000 |
| 1 1/2"-6 | 4" | 2" | 000000000 | 00000 | 00000 |
Metric Low-Strength Steel Coupling Nuts
Often referred to as extension nuts, use these to connect and extend threaded rods. They're about half the strength of medium-strength steel coupling nuts for use in light duty fastening applications.
Black-oxide steel coupling nuts have a dark surface color and are mildly corrosion resistant in dry environments.
For technical drawings and 3-D models, click on a part number.
Thread | Each | ||||||
|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Lg., mm | Wd., mm | Specifications Met | 1-9 | 10-Up | |
Black-Oxide Steel | |||||||
| M2 | 0.4 | 6 | 4.5 | __ | 000000000 | 00000 | 00000 |
| M2.5 | 0.45 | 6 | 4.5 | __ | 000000000 | 0000 | 0000 |
| M3 | 0.5 | 9 | 6 | __ | 000000000 | 0000 | 0000 |
| M3.5 | 0.6 | 10 | 6 | __ | 000000000 | 0000 | 0000 |
| M4 | 0.7 | 12 | 7 | __ | 000000000 | 0000 | 0000 |
| M5 | 0.8 | 15 | 8 | __ | 000000000 | 0000 | 0000 |
| M6 | 1 | 16 | 13 | __ | 000000000 | 0000 | 0000 |
| M8 | 1.25 | 19 | 14 | __ | 000000000 | 0000 | 0000 |
| M10 | 1.5 | 24 | 16 | __ | 000000000 | 0000 | 0000 |
| M12 | 1.75 | 32 | 22 | __ | 000000000 | 0000 | 0000 |
| M16 | 2 | 40 | 27 | __ | 000000000 | 0000 | 0000 |
| M18 | 2.5 | 54 | 27 | DIN 6334 | 000000000 | 00000 | 00000 |
| M20 | 2.5 | 51 | 32 | __ | 000000000 | 00000 | 0000 |
| M22 | 2.5 | 66 | 32 | DIN 6334 | 000000000 | 00000 | 00000 |
| M24 | 3 | 64 | 38 | __ | 000000000 | 00000 | 00000 |
| M27 | 3 | 81 | 41 | DIN 6334 | 000000000 | 00000 | 00000 |
| M30 | 3.5 | 90 | 46 | DIN 6334 | 000000000 | 00000 | 00000 |
| M36 | 4 | 108 | 55 | DIN 6334 | 000000000 | 000000 | 00000 |