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.

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.

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		On Request	On Request
M6		On Request	On Request
M7	On Request	On Request	On Request
M8		On Request	On Request
M10		On Request	On Request
M12			On Request
M14		On Request	On Request
M16			On Request
M18		On Request	On Request
M20			On Request
M22		On Request	On Request
M24			On Request
M27		On Request	On Request
M30		On Request	On Request
M33		On Request	On Request	On Request	On Request
M36		On Request	On Request		On Request
M39		On Request	On Request	On Request	On Request
M42		On Request	On Request	On Request	On Request
M45		On Request	On Request	On Request	On Request
M48		On Request	On Request	On Request	On Request
M52		On Request	On Request	On Request	On Request
M56		On Request	On Request	On Request	On Request
M58	On Request	On Request	On Request	On Request	On Request
M60		On Request	On Request	On Request	On Request
M64		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