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RoHS (Restriction of Hazardous Substances) RoHS (Restriction ofHazardous Substances) |
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REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration,Evaluation, Authorization and Restriction of Chemicals) |
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DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement) |
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About Nuts, Materials, and Finishes
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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 |
High-Strength Steel Extra-Wide Hex Nuts for Structural Applications—Grade C




These nuts are designed to secure ASTM A325 bolts in structural joints. Also known as heavy hex nuts, they are about 10% wider and taller than standard hex nuts and distribute the load over a large area.
Steel nuts without a finish are weldable and ready to be painted or finished.
Black-oxide steel nuts have a dark surface color and are mildly corrosion resistant in dry environments.
Hot-dipped galvanized steel nuts have a thick coating for good corrosion resistance. They must be used with other hot-dipped galvanized fasteners.
For technical drawings and 3-D models, click on a part number.
Thread Size | Wd. | Ht. | Specifications Met | Pkg. Qty. | Pkg. | |
Steel—ASTM Grade C | ||||||
---|---|---|---|---|---|---|
1/2"-13 | 7/8" | 31/64" | ASTM A563 | 25 | 000000000 | 000000 |
5/8"-11 | 1 1/16" | 39/64" | ASTM A563 | 10 | 000000000 | 0000 |
3/4"-10 | 1 1/4" | 47/64" | ASTM A563 | 10 | 000000000 | 00000 |
7/8"-9 | 1 7/16" | 55/64" | ASTM A563 | 10 | 000000000 | 00000 |
1"-8 | 1 5/8" | 63/64" | ASTM A563 | 5 | 000000000 | 00000 |
1 1/8"-7 | 1 3/4" | 1 7/64" | ASTM A563 | 1 | 000000000 | 0000 |
1 1/4"-7 | 2" | 1 7/32" | ASTM A563 | 1 | 000000000 | 0000 |
1 1/2"-6 | 2 3/8" | 1 15/32" | ASTM A563 | 1 | 000000000 | 00000 |
Black-Oxide Steel—ASTM Grade C | ||||||
1/2"-13 | 7/8" | 31/64" | ASTM A563 | 10 | 000000000 | 0000 |
5/8"-11 | 1 1/16" | 39/64" | ASTM A563 | 10 | 000000000 | 00000 |
3/4"-10 | 1 1/4" | 47/64" | ASTM A563 | 5 | 000000000 | 0000 |
7/8"-9 | 1 7/16" | 55/64" | ASTM A563 | 1 | 000000000 | 0000 |
1"-8 | 1 5/8" | 63/64" | ASTM A563 | 1 | 000000000 | 0000 |
1 1/8"-7 | 1 3/4" | 1 7/64" | ASTM A563 | 1 | 000000000 | 0000 |
1 1/4"-7 | 2" | 1 7/32" | ASTM A563 | 1 | 000000000 | 00000 |
1 1/2"-6 | 2 3/8" | 1 15/32" | ASTM A563 | 1 | 000000000 | 00000 |
Hot-Dipped Galvanized Steel—ASTM Grade C | ||||||
1/2"-13 | 7/8" | 31/64" | ASTM A563 | 5 | 000000000 | 0000 |
5/8"-11 | 1 1/16" | 39/64" | ASTM A563 | 1 | 000000000 | 0000 |
3/4"-10 | 1 1/4" | 47/64" | ASTM A563 | 1 | 000000000 | 0000 |
7/8"-9 | 1 7/16" | 55/64" | ASTM A563 | 1 | 000000000 | 00000 |
1"-8 | 1 5/8" | 63/64" | ASTM A563 | 1 | 000000000 | 00000 |
1 1/8"-7 | 1 3/4" | 1 7/64" | ASTM A563 | 1 | 000000000 | 00000 |
1 1/4"-7 | 2" | 1 7/32" | ASTM A563 | 1 | 000000000 | 00000 |