DINscrewsSocket head (cylindrical)

DIN 912 Hexagon Socket Head Cap Screw

A cap screw with a cylindrical head and internal hex drive. Because the head sits above the surface and the drive is recessed, it can be tightened hard and used in counterbores for a flush finish.

DIN 912 M8 × 50 — Socket head (cylindrical)Nominal dimensions in mm · Not to scale

Dimensions15 sizes · millimetres

Thread d	Pitch P (mm)	Head diameter dk (mm)	Head height k (mm)	Socket size s (mm)	Thread length b (min) (mm)
M2	0.4	3.8	2	1.5	16
M2.5	0.45	4.5	2.5	2	17
M3	0.5	5.5	3	2.5	18
M4	0.7	7	4	3	20
M5	0.8	8.5	5	4	22
M6	1	10	6	5	24
M8	1.25	13	8	6	28
M10	1.5	16	10	8	32
M12	1.75	18	12	10	36
M14	2	21	14	12	40
M16	2	24	16	14	44
M18	2.5	27	18	14	48
M20	2.5	30	20	17	52
M22	2.5	33	22	17	56
M24	3	36	24	19	60

Nominal dimensions in millimetres as published in DIN 912. Tolerances, material requirements and marking are defined separately by the issuing body.

Available sizeslinked to individual specification pages

M2 × 4 M2 × 5 M2 × 6 M2 × 8 M2 × 10 M2 × 12 M2 × 16 M2 × 20

M2.50.45 mm pitch

M2.5 × 4 M2.5 × 5 M2.5 × 6 M2.5 × 8 M2.5 × 10 M2.5 × 12 M2.5 × 16 M2.5 × 20 M2.5 × 25

M3 × 5 M3 × 6 M3 × 8 M3 × 10 M3 × 12 M3 × 16 M3 × 20 M3 × 25 M3 × 30

M4 × 6 M4 × 8 M4 × 10 M4 × 12 M4 × 16 M4 × 20 M4 × 25 M4 × 30 M4 × 40

M5 × 8 M5 × 10 M5 × 12 M5 × 16 M5 × 20 M5 × 25 M5 × 30 M5 × 40 M5 × 50

M6

M6 × 10 M6 × 12 M6 × 16 M6 × 20 M6 × 25 M6 × 30 M6 × 35 M6 × 40 M6 × 50 M6 × 60

M81.25 mm pitch

M8 × 12 M8 × 16 M8 × 20 M8 × 25 M8 × 30 M8 × 35 M8 × 40 M8 × 50 M8 × 60 M8 × 80

M101.5 mm pitch

M10 × 16 M10 × 20 M10 × 25 M10 × 30 M10 × 35 M10 × 40 M10 × 50 M10 × 60 M10 × 80 M10 × 100

M121.75 mm pitch

M12 × 20 M12 × 25 M12 × 30 M12 × 35 M12 × 40 M12 × 50 M12 × 60 M12 × 80 M12 × 100

M14

M14 × 25 M14 × 30 M14 × 35 M14 × 40 M14 × 50 M14 × 60 M14 × 80 M14 × 100

M16

M16 × 25 M16 × 30 M16 × 35 M16 × 40 M16 × 50 M16 × 60 M16 × 80 M16 × 100

M182.5 mm pitch

M18 × 30 M18 × 35 M18 × 40 M18 × 50 M18 × 60 M18 × 80 M18 × 100

M202.5 mm pitch

M20 × 30 M20 × 35 M20 × 40 M20 × 50 M20 × 60 M20 × 80 M20 × 100

M222.5 mm pitch

M22 × 40 M22 × 50 M22 × 60 M22 × 80 M22 × 100

M24

M24 × 40 M24 × 50 M24 × 60 M24 × 80 M24 × 100

Thread referencesused by the sizes above

M2 × 0.4 M2.5 × 0.45 M3 × 0.5 M4 × 0.7 M5 × 0.8 M8 × 1.25 M10 × 1.5 M12 × 1.75 M18 × 2.5 M20 × 2.5 M22 × 2.5