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Medium-Strength Steel Locknuts for use with Cotter Pins—Grade 5
Secure these hex slotted nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included. They're zinc plated to resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size  | Wd. | Ht. | For Cotter Pin Dia. | Min. Slot Wd. | Min. Slot Dp. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Grade 5 | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 25 | 000000000 | 000000 |
| 1/4"-28 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 10 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 17/64" | 5/64" | 0.09" | 0.078" | 25 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 21/64" | 7/64" | 0.12" | 0.11" | 25 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 21/64" | 7/64" | 0.12" | 0.11" | 10 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 3/8" | 7/64" | 0.12" | 0.135" | 25 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 3/8" | 7/64" | 0.12" | 0.135" | 10 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 7/16" | 7/64" | 0.15" | 0.137" | 10 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 7/64" | 0.15" | 0.137" | 10 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | 9/64" | 0.15" | 0.163" | 10 | 000000000 | 00000 |
| 9/16"-18 | 7/8" | 31/64" | 9/64" | 0.15" | 0.163" | 10 | 000000000 | 00000 |
| 5/8"-11 | 15/16" | 35/64" | 5/32" | 0.18" | 0.195" | 10 | 000000000 | 00000 |
| 5/8"-18 | 15/16" | 35/64" | 5/32" | 0.18" | 0.195" | 10 | 000000000 | 00000 |
| 3/4"-10 | 1 1/8" | 41/64" | 5/32" | 0.18" | 0.217" | 5 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8" | 41/64" | 5/32" | 0.18" | 0.217" | 5 | 000000000 | 00000 |
| 7/8"-14 | 1 5/16" | 49/64" | 3/16" | 0.18" | 0.204" | 1 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 1 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 1 | 000000000 | 0000 |
| 1 1/4"-7 | 1 7/8" | 1 3/32" | 5/16" | 0.31" | 0.33" | 1 | 000000000 | 0000 |
| 1 1/4"-12 | 1 7/8" | 1 3/32" | 5/16" | 0.31" | 0.33" | 1 | 000000000 | 00000 |
Metric Medium-Strength Steel Locknuts for use with Cotter Pins—Class 8
Often referred to as castle nuts, secure these by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included.
Zinc-plated steel locknuts resist corrosion in wet environments.
Steel locknuts are best for dry environments, since moisture will cause them to rust. They are weldable and can be painted or finished.
For technical drawings and 3-D models, click on a part number.
Thread | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Size | Pitch, mm | Wd., mm | Ht., mm | For Cotter Pin Dia., mm | Min. Slot Wd., mm | Min. Slot Dp., mm | Specifications Met | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel—Class 8 | ||||||||||
| M6 | 1 | 10 | 7.5 | 1.6 | 2 | 2.5 | DIN 935 | 5 | 000000000 | 00000 |
| M8 | 1.25 | 13 | 9.5 | 2 | 2.5 | 3 | DIN 935 | 5 | 000000000 | 0000 |
| M10 | 1.5 | 17 | 12 | 2.5 | 2.8 | 4 | DIN 935 | 5 | 000000000 | 0000 |
| M12 | 1.5 | 19 | 15 | 3.2 | 3.5 | 5 | DIN 935 | 5 | 000000000 | 0000 |
| M12 | 1.75 | 19 | 15 | 3.2 | 3.5 | 5 | DIN 935 | 5 | 000000000 | 0000 |
| M14 | 1.5 | 22 | 16 | 3.2 | 3.5 | 5 | DIN 935 | 1 | 000000000 | 0000 |
| M14 | 2 | 22 | 16 | 3.2 | 3.5 | 5 | DIN 935 | 1 | 000000000 | 0000 |
| M16 | 1.5 | 24 | 19 | 4 | 4.5 | 6 | DIN 935 | 10 | 000000000 | 00000 |
| M16 | 2 | 24 | 19 | 4 | 4.5 | 6 | DIN 935 | 5 | 000000000 | 0000 |
| M18 | 2.5 | 27 | 21 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M20 | 2.5 | 30 | 22 | 4 | 4.5 | 6 | DIN 935 | 5 | 000000000 | 00000 |
| M24 | 2 | 36 | 27 | 5 | 5.5 | 8 | DIN 935 | 1 | 000000000 | 0000 |
| M24 | 3 | 36 | 27 | 5 | 5.5 | 8 | DIN 935 | 1 | 000000000 | 0000 |
| M27 | 3 | 41 | 30 | 5 | 5.5 | 8 | DIN 935 | 1 | 000000000 | 00000 |
| M30 | 3.5 | 46 | 33 | 6.3 | 7 | 9 | DIN 935 | 1 | 000000000 | 00000 |
Steel—Class 8 | ||||||||||
| M12 | 1.5 | 19 | 15 | 3.2 | 3.5 | 5 | DIN 935 | 10 | 000000000 | 0000 |
| M14 | 1.5 | 22 | 16 | 3.2 | 3.5 | 5 | DIN 935 | 1 | 000000000 | 0000 |
| M14 | 2 | 22 | 16 | 3.2 | 3.5 | 5 | DIN 935 | 1 | 000000000 | 0000 |
| M16 | 1.5 | 24 | 19 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M16 | 2 | 24 | 19 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M18 | 2.5 | 27 | 21 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M20 | 2.5 | 30 | 22 | 4 | 4.5 | 6 | DIN 935 | 1 | 000000000 | 0000 |
| M24 | 3 | 36 | 27 | 5 | 5.5 | 8 | DIN 935 | 1 | 000000000 | 0000 |
| M30 | 3.5 | 46 | 33 | 6.3 | 7 | 9 | DIN 935 | 1 | 000000000 | 00000 |
| M36 | 3 | 55 | 38 | 6.3 | 7 | 9 | DIN 935 | 1 | 000000000 | 00000 |
| M36 | 4 | 55 | 38 | 6.3 | 7 | 9 | DIN 935 | 1 | 000000000 | 00000 |
| M42 | 4.5 | 65 | 46 | 8 | 9 | 12 | DIN 935 | 1 | 000000000 | 00000 |
| M48 | 5 | 75 | 50 | 8 | 9 | 12 | DIN 935 | 1 | 000000000 | 00000 |
| M56 | 5.5 | 85 | 57 | 8 | 9 | 12 | DIN 935 | 1 | 000000000 | 00000 |
Low-Strength Steel Locknuts for use with Cotter Pins
Secure these hex slotted nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included.
Black-oxide steel locknuts have a dark surface color and are mildly corrosion resistant in dry environments.
Zinc-plated steel locknuts resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | For Cotter Pin Dia. | Min. Slot Wd. | Min. Slot Dp. | Pkg. Qty. | Pkg. | |
Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4"-20 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 25 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 17/64" | 5/64" | 0.09" | 0.078" | 25 | 000000000 | 0000 |
| 1"-14 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 1 | 000000000 | 0000 |
Black-Oxide Steel | ||||||||
| 1 1/2"-12 | 2 1/4" | 1 9/32" | 5/16" | 0.42" | 0.441" | 1 | 000000000 | 00000 |
Zinc-Plated Steel | ||||||||
| 1/4"-20 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 50 | 000000000 | 00000 |
| 1/4"-28 | 7/16" | 7/32" | 1/16" | 0.07" | 0.072" | 50 | 000000000 | 00000 |
| 5/16"-18 | 1/2" | 17/64" | 5/64" | 0.09" | 0.078" | 25 | 000000000 | 0000 |
| 5/16"-24 | 1/2" | 17/64" | 5/64" | 0.09" | 0.078" | 25 | 000000000 | 0000 |
| 3/8"-16 | 9/16" | 21/64" | 7/64" | 0.12" | 0.11" | 25 | 000000000 | 00000 |
| 3/8"-24 | 9/16" | 21/64" | 7/64" | 0.12" | 0.11" | 25 | 000000000 | 00000 |
| 7/16"-14 | 11/16" | 3/8" | 3/32" | 0.12" | 0.155" | 25 | 000000000 | 00000 |
| 7/16"-20 | 11/16" | 3/8" | 3/32" | 0.12" | 0.155" | 25 | 000000000 | 00000 |
| 1/2"-13 | 3/4" | 7/16" | 1/8" | 0.15" | 0.148" | 25 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 7/16" | 1/8" | 0.15" | 0.148" | 25 | 000000000 | 00000 |
| 9/16"-12 | 7/8" | 31/64" | 7/64" | 0.15" | 0.163" | 10 | 000000000 | 00000 |
| 9/16"-18 | 7/8" | 31/64" | 7/64" | 0.15" | 0.163" | 5 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 35/64" | 5/32" | 0.18" | 0.219" | 10 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 35/64" | 5/32" | 0.18" | 0.195" | 10 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 21/32" | 5/32" | 0.18" | 0.265" | 10 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8" | 21/32" | 5/32" | 0.18" | 0.265" | 10 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 3/4" | 5/32" | 0.18" | 0.204" | 5 | 000000000 | 00000 |
| 7/8"-14 | 1 5/16" | 3/4" | 5/32" | 0.18" | 0.204" | 5 | 000000000 | 0000 |
| 1"-8 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 5 | 000000000 | 00000 |
| 1"-14 | 1 1/2" | 55/64" | 3/16" | 0.24" | 0.241" | 5 | 000000000 | 00000 |
| 1 1/4"-7 | 1 7/8" | 1 3/32" | 9/32" | 0.31" | 0.297" | 1 | 000000000 | 0000 |
| 1 1/4"-12 | 1 7/8" | 1 1/16" | 9/32" | 0.31" | 0.33" | 1 | 000000000 | 0000 |
| 1 1/2"-6 | 2 1/4" | 1 5/16" | 5/16" | 0.37" | 0.457" | 1 | 000000000 | 00000 |
| 1 1/2"-12 | 2 1/4" | 1 5/16" | 5/16" | 0.37" | 0.457" | 1 | 000000000 | 00000 |
| 1 3/4"-5 | 2 5/8" | 1 1/2" | 3/8" | 0.43" | 0.44" | 1 | 000000000 | 00000 |
| 1 3/4"-12 | 2 5/8" | 1 1/2" | 3/8" | 0.43" | 0.44" | 1 | 000000000 | 00000 |
| 2"-4 1/2 | 3" | 1 23/32" | 3/8" | 0.43" | 0.485" | 1 | 000000000 | 00000 |
| 2"-12 | 3" | 1 23/32" | 3/8" | 0.43" | 0.485" | 1 | 000000000 | 00000 |
Stainless Steel Locknuts for use with Cotter Pins
These locknuts have good chemical resistance and may be mildly magnetic. Also known as castle nuts, secure them by inserting a cotter pin or safety wire through the slots in the nut and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots. Cotter pins are not included.
For technical drawings and 3-D models, click on a part number.
| Thread Size | Wd. | Ht. | For Cotter Pin Dia. | Min. Slot Wd. | Min. Slot Dp. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
| 10-32 | 3/8" | 1/4" | 3/64" | 0.06" | 0.09" | 5 | 000000000 | 000000 |
| 1/4"-20 | 7/16" | 9/32" | 1/16" | 0.07" | 0.09" | 5 | 000000000 | 0000 |
| 1/4"-28 | 7/16" | 9/32" | 1/16" | 0.07" | 0.09" | 5 | 000000000 | 0000 |
| 5/16"-18 | 1/2" | 21/64" | 5/64" | 0.09" | 0.09" | 5 | 000000000 | 00000 |
| 5/16"-24 | 1/2" | 21/64" | 5/64" | 0.09" | 0.09" | 5 | 000000000 | 00000 |
| 3/8"-16 | 9/16" | 13/32" | 3/32" | 0.12" | 0.13" | 1 | 000000000 | 0000 |
| 3/8"-24 | 9/16" | 13/32" | 3/32" | 0.12" | 0.13" | 1 | 000000000 | 0000 |
| 1/2"-13 | 3/4" | 9/16" | 1/8" | 0.15" | 0.15" | 1 | 000000000 | 0000 |
| 1/2"-20 | 3/4" | 9/16" | 1/8" | 0.15" | 0.15" | 1 | 000000000 | 0000 |
| 5/8"-11 | 15/16" | 23/32" | 5/32" | 0.18" | 0.21" | 1 | 000000000 | 0000 |
| 5/8"-18 | 15/16" | 23/32" | 5/32" | 0.18" | 0.21" | 1 | 000000000 | 0000 |
| 3/4"-10 | 1 1/8" | 13/16" | 5/32" | 0.18" | 0.25" | 1 | 000000000 | 00000 |
| 3/4"-16 | 1 1/8" | 13/16" | 5/32" | 0.18" | 0.25" | 1 | 000000000 | 00000 |
| 7/8"-9 | 1 5/16" | 29/32" | 5/32" | 0.18" | 0.25" | 1 | 000000000 | 00000 |
| 1"-8 | 1 1/2" | 1" | 3/16" | 0.24" | 0.28" | 1 | 000000000 | 00000 |
| 1 1/4"-7 | 1 7/8" | 1 1/4" | 7/32" | 0.31" | 0.37" | 1 | 000000000 | 00000 |
| 1 1/2"-6 | 2 1/4" | 1 1/2" | 1/4" | 0.37" | 0.43" | 1 | 000000000 | 00000 |