DINscrewsCountersunk head (90°)

DIN 7991 Hexagon Socket Countersunk Head Screw

Flat head version of the socket screw. The 90° cone seats flush in a matching countersink so nothing protrudes above the surface.

Dimensioned drawing — DIN 7991 M10 × 20k 6.2L 20⌀20⌀10
DIN 7991 M10 × 20 — Countersunk head (90°)Nominal dimensions in mm · Not to scale

Dimensions11 sizes · millimetres

Thread dPitch P (mm)Head diameter dk (mm)Head height k (mm)Socket size s (mm)Thread length b (min) (mm)
M30.561.86218
M40.782.482.520
M50.8103.1322
M61123.72424
M81.25164.96528
M101.5206.2632
M121.75247.44836
M142278.41040
M162308.81244
M182.53310.21448
M202.536111452

Nominal dimensions in millimetres as published in DIN 7991. Tolerances, material requirements and marking are defined separately by the issuing body.

Available sizeslinked to individual specification pages

M30.5 mm pitch
M3 × 6M3 × 8M3 × 10M3 × 12M3 × 16M3 × 20M3 × 25M3 × 30
M40.7 mm pitch
M4 × 6M4 × 8M4 × 10M4 × 12M4 × 16M4 × 20M4 × 25M4 × 30M4 × 40
M50.8 mm pitch
M5 × 8M5 × 10M5 × 12M5 × 16M5 × 20M5 × 25M5 × 30M5 × 40M5 × 50
M6
M6 × 10M6 × 12M6 × 16M6 × 20M6 × 25M6 × 30M6 × 35M6 × 40M6 × 50M6 × 60
M81.25 mm pitch
M8 × 12M8 × 16M8 × 20M8 × 25M8 × 30M8 × 35M8 × 40M8 × 50M8 × 60M8 × 80
M101.5 mm pitch
M10 × 16M10 × 20M10 × 25M10 × 30M10 × 35M10 × 40M10 × 50M10 × 60M10 × 80M10 × 100
M121.75 mm pitch
M12 × 20M12 × 25M12 × 30M12 × 35M12 × 40M12 × 50M12 × 60M12 × 80M12 × 100
M14
M14 × 25M14 × 30M14 × 35M14 × 40M14 × 50M14 × 60M14 × 80M14 × 100
M16
M16 × 25M16 × 30M16 × 35M16 × 40M16 × 50M16 × 60M16 × 80M16 × 100
M182.5 mm pitch
M18 × 30M18 × 35M18 × 40M18 × 50M18 × 60M18 × 80M18 × 100
M202.5 mm pitch
M20 × 30M20 × 35M20 × 40M20 × 50M20 × 60M20 × 80M20 × 100

Thread referencesused by the sizes above

M3 × 0.5M4 × 0.7M5 × 0.8M8 × 1.25M10 × 1.5M12 × 1.75M18 × 2.5M20 × 2.5