DIN 7991

Replaced by ISO 10642

Hexagon socket countersunk head screws

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Screw Thread
d		 M3 M4 M5 M6
P Pitch 0.5 0.7 0.8 1
α tol.(+2) 90° 90° 90° 90°
Length of Thread
b		 L≤125 12 14 16 18
125＜L ≤ 200 / / / 24
L＞200 / / / /
dk max=nominal size 6 8 10 12
min 5.7 7.64 9.64 11.57
ds max=nominal size 3 4 5 6
min 2.86 3.82 4.82 5.82
e min 2.3 2.87 3.44 4.58
k max 1.7 2.3 2.8 3.3
s Nominal Size 2 2.5 3 4
min 2.02 2.52 3.02 4.02
max 2.1 2.6 3.1 4.12
t max=nominal size 1.2 1.8 2.3 2.5
min 0.95 1.55 2.05 2.25

Screw Thread
d		 M8 M10 M12
P Pitch 1.25 1.5 1.75
α tol.(+2) 90° 90° 90°
Length of Thread
b		 L≤125 22 26 30
125＜L ≤ 200 28 32 36
L＞200 / 45 49
dk max=nominal size 16 20 24
min 15.57 19.48 23.48
ds max=nominal size 8 10 12
min 7.78 9.78 11.73
e min 5.72 6.86 9.15
k max 4.4 5.5 6.5
s Nominal Size 5 6 8
min 5.02 6.02 8.025
max 5.14 6.14 8.175
t max=nominal size 3.5 4.4 4.6
min 3.2 4.1 4.3

Screw Thread
d		 (M14) M16 (M18)
P Pitch 2 2 2.5
α tol.(+2) 90° 90° 90°
Length of Thread
b		 L≤125 34 38 42
125＜L ≤ 200 40 44 48
L＞200 53 57 61
dk max=nominal size 27 30 33
min 26.48 29.48 32.38
ds max=nominal size 14 16 18
min 13.73 15.73 17.73
e min 11.43 11.43 13.72
k max 7 7.5 8
s Nominal Size 10 10 12
min 10.025 10.025 12.032
max 10.175 10.175 12.212
t max=nominal size 4.8 5.3 5.5
min 4.5 5 5.2

Screw Thread
d		 M20 (M22) M24
P Pitch 2.5 2.5 3
α tol.(+2) 90° 60° 60°
Length of Thread
b		 L≤125 46 50 54
125＜L ≤ 200 52 56 60
L＞200 65 69 73
dk max=nominal size 36 36 39
min 35.38 35.38 38.38
ds max=nominal size 20 22 24
min 19.67 21.67 23.67
e min 13.72 16 16
k max 8.5 13.1 14
s Nominal Size 12 14 14
min 12.032 14.032 14.032
max 12.212 14.212 14.212
t max=nominal size 5.9 8.8 10.3
min 5.6 8.44 9.87



All information is strictly informative