Selected screw and nut dimensions

⚠️ Author’s Note / Disclaimer This page serves as my personal reference collection of dimensions and specifications for various norm screws, nuts, and related fasteners. The data compiled here is primarily intended for my own convenience during design, prototyping, and workshop tasks. While I’ve done my best to ensure accuracy, I make no guarantees regarding completeness or correctness.

• Nuts
  • DIN 934/ISO 4032 hex nuts
• Screws
  • DIN 912 / ISO 4762 cylinder head screws

DIN 934/ISO 4032 hex nuts

Diameter (d)	Height (m)	Outer diameter (e)	Key diameter (s)
M1	0.8	2.71	2.5
M1.2	1	3,28	3
M1.4	1,2	3,28	3
M1.6	1,3	3,48	3,2
M1.7	1,4	3,82	3,2
M1.8	1,4	4,21	3,5
M2	1,6	4,32	4
M2.3	1,8	4,88	4,5
M2.5	2	5,45	5
M2.6	2	5,45	5
M3	2,4	6,01	5,5
M3.5	2,8	6,58	6
M4	3,2	7,66	7
M5	4	8,79	8
M6	5	11,05	10
M7	5,5	12,12	11
M8	6,5	14,38	13
M10	8	18,9	17
M12	10	21,1	19
M14	11	24,49	22
M16	13	26,75	24
M18	15	29,56	27
M20	16	32,95	30
M22	18	35,03	32
M24	19	39,55	36
M27	22	45,2	41
M30	24	50,85	46
M33	26	55,37	50
M36	29	60,79	55
M39	31	66,44	60
M42	34	71,3	65
M45	36	76,95	70
M48	38	82,6	75
M52	42	88,25	80

DIN 912 / ISO 4762 cylinder head screws

Diameter (d)	Head diameter (dk)	Head height (k)	Key width (s)	Threading length (b)	Pitch (P)	Core hole diameter	Through hole fine	Through hole medium	Through hole coarse
M1.6	3	1.6	1.5	15	0.35	1.25	1.7	1.8	2
M2	3.8	2	1.5	16	0.4	1.6	2.2	2.4	2.6
M2.5	4.5	2.5	2	17	0.45	2.05	2.7	2.9	3.1
M3	5.5	3	2.5	18	0.5	2.5	3.2	3.4	3.6
M4	7	4	3	20	0.7	3.3	4.3	4.5	4.8
M5	8.5	5	4	22	0.8	4.2	5.3	5.5	5.8
M6	10	6	5	24	1.0	5	6.4	6.6	7
M8	13	8	5	28	1.25	6.8	8.4	9	10
M10	16	10	8	32	1.5	8.5	10.5	11	12
M12	18	12	10	36	1.75	10.2	13	13.5	14.5
M14	21	14	12	40
M16	24	16	14	44	2	14	17	17.5	18.5
M18	27	28	14	48
M20	30	20	17	52	2.5	17.5	21	22	24