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DIN 7991 Specifications

DIN 7991 Specifications

DIN 7991
Replaced by ISO 10642
Hexagon socket countersunk head screws

DIN 7991 Specifications

Screw Thread Technical Specifications
Screw Thread M3 M4 M5 M6
d
P Pitch 0.5 0.7 0.8 1
α tol.(+2) 90° 90° 90° 90°
Length of Thread L≤125 12 14 16 18
b 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 M8 M10 M12 (M14)
d
P Pitch 1.25 1.5 1.75 2
α tol.(+2) 90° 90° 90° 90°
Length of Thread L≤125 22 26 30 34
b 125＜L ≤ 200 28 32 36 40
L＞200 / 45 49 53
dk max=nominal size 16 20 24 27
min 15.57 19.48 23.48 26.48
ds max=nominal size 8 10 12 14
min 7.78 9.78 11.73 13.73
e min 5.72 6.86 9.15 11.43
k max 4.4 5.5 6.5 7
s Nominal Size 5 6 8 10
min 5.02 6.02 8.025 10.025
max 5.14 6.14 8.175 10.175
t max=nominal size 3.5 4.4 4.6 4.8
min 3.2 4.1 4.3 4.5
Screw Thread M16 (M18) M20 M24
d
P Pitch 2 2.5 2.5 3
α tol.(+2) 90° 90° 90° 60°
Length of Thread L≤125 38 42 46 54
b 125＜L ≤ 200 44 48 52 60
L＞200 57 61 65 73
dk max=nominal size 30 33 36 39
min 29.48 32.38 35.38 38.38
ds max=nominal size 16 18 20 24
min 15.73 17.73 19.67 23.67
e min 11.43 13.72 13.72 16
k max 7.5 8 8.5 14
s Nominal Size 10 12 12 14
min 10.025 12.032 12.032 14.032
max 10.175 12.212 12.212 14.212
t max=nominal size 5.3 5.5 5.9 10.3
min 5 5.2 5.6 9.87