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Slotted Nuts

A Slotted Nut has slots cut into one end of the nut.

When it is used in an application, a bolt or threaded bar generally has a pre-drilled hole so that when the slotted nut is threaded on and torqued to the required position, it can be then secured using a cotter pin or write to prevent rotation.

Slotted Nuts are used in applications where vibration or motion might undo the locknut.

Both a Castle Nut and Slotted Nut look similar, and can often be used interchangeably because they have almost identical dimensions. However, they are different in that the protrusions on a Slotted Nut are from the base of the nut and include the corners, whereas a Castle Nut looks like a standard nut with triangular portions protruding, but not including the corners of the hex.

castle-nut

This is a Castle Nut.

Slotted nuts are generally manufactured as standard from Steel Grade 4, 8 and 10, and A2 and A4 Stainless Steel.

A range of sizes, thread styles and materials are available now from Fastenright, with specials available to order.

Non-standard sizes, materials and finishes are available to order as specials, including small volume manufacture, modifications and custom parts made to drawings.

Minimum order quantities may apply.

Slotted Nuts Technical Drawing

Metric Technical Data & Available Sizes
Thread Diameter S (mm) E (mm) M max. (mm) W max. (mm) N min. (mm)
M4 7 7.74 5 3.2 1.2
M5 8 8.87 6 4 1.4
M6 10 11.05 7.5 5 2
M7  11 12.12 8 5.5 2
M8 13 14.38 9.5 6.5 2.5
M10 17 18.9 12 8 2.8
M12 19 21.1 15 10 3.5
M14 22 24.49 16 11 3.5
M16 24 26.75 19 13 4.5
M18 27 29.56 21 15 4.5
M20 30 32.95 22 16 4.5
M22 32 35.03 26 18 5.5
M24 36 39.55 27 19 5.5
M27 41 45.2 30 22 5.5
M30 46 50.85 33 24 7
M33 50 55.37 35 26 7
M36 55 60.79 38 29 7
M39 60 66.44 40 31 7
M42 65 71.3 46 34 9
M45 70 78.26 48 36 9
M48 75 82.6 50 38 9
M52 80 88.25 54 42 9
M56 85 95.07 57 45 9
M58 90 100.72 63 48 11
M60 90 100.72 63 48 11
M64 95 106.37 66 51 11
M68 100 112.02 69 54 11
M72 105 117.67 73 58 11
M76 110 123.32 76 61 11
M80 115 128.97 79 64 11
M85 120 134.62 88 68 14
M90 130 145.77 92 72 14
M95 135 151.42 96 76 14
M100 145 162.72 100 80 14
Size not listed? Please enquire – we may be able to provide it.

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