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Castle Nuts (DIN 935)

Castle Nuts are made to DIN 935 and are often used alongside a bolt or a threaded rod that feature a pre-drilled hole, where a cotter pin can be used to secure the fixing and prevent movement.

These locknuts are also referred to as a ‘Castellated Nut’, and are ideal for use in applications where vibrations may undo a fixing.

Sometimes incorrectly, they are referred to as Slotted Nuts. Castle Nuts are a different fastener altogether. They visually look more like a Hex Nut and host protruding triangular portions, where as a Slotted Nut (pictured below), looks as though a Hex Nut has been cut with the slots and corners forming part of the protrusion.
slotted-nut-din-935

This is a slotted nut.

Castle Nuts are generally manufactured in Steel or Stainless Steel, with other materials also available.

They are available in a range of sizes, with thin versions also available.

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

Castle nut diagram image

Metric Technical Data
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
Metric Available Sizes & Materials
Thread Diameter Grade 4 Steel
Grade 8 Steel Grade 10 Steel
A2 Stainless Steel A4 Stainless Steel
M4 On Request On Request On Request On Request On Request
M5 Placeholder image On Request On Request Placeholder image Placeholder image
M6 Placeholder image On Request On Request Placeholder image Placeholder image
M7 On Request On Request On Request Placeholder image Placeholder image
M8 Placeholder image On Request On Request Placeholder image Placeholder image
M10 Placeholder image On Request On Request Placeholder image Placeholder image
M12 Placeholder image Placeholder image On Request Placeholder image Placeholder image
M14 Placeholder image On Request On Request Placeholder image Placeholder image
M16 Placeholder image Placeholder image On Request Placeholder image Placeholder image
M18 Placeholder image On Request On Request Placeholder image Placeholder image
M20 Placeholder image Placeholder image On Request Placeholder image Placeholder image
M22 Placeholder image On Request On Request Placeholder image Placeholder image
M24 Placeholder image Placeholder image On Request Placeholder image Placeholder image
M27 Placeholder image On Request On Request Placeholder image Placeholder image
M30 Placeholder image On Request On Request Placeholder image Placeholder image
M33 Placeholder image On Request On Request On Request On Request
M36 Placeholder image On Request On Request Placeholder image On Request
M39 Placeholder image On Request On Request On Request On Request
M42 Placeholder image On Request On Request On Request On Request
M45 Placeholder image On Request On Request On Request On Request
M48 Placeholder image On Request On Request On Request On Request
M52 Placeholder image On Request On Request On Request On Request
M56 Placeholder image On Request On Request On Request On Request
M58 On Request On Request On Request On Request On Request
M60 Placeholder image On Request On Request On Request On Request
M64 Placeholder image On Request On Request On Request On Request
M68 On Request On Request On Request On Request On Request
M72 On Request On Request On Request On Request On Request
M76 On Request On Request On Request On Request On Request
M80 On Request On Request On Request On Request On Request
M85 On Request On Request On Request On Request On Request
M90 On Request On Request On Request On Request On Request
M95 On Request On Request On Request On Request On Request
M100 On Request On Request On Request On Request On Request
black icon image = Available
Size not listed? Please contact us – we may be able to provide it.

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