DIN 603

Cup Head Square Neck Bolts

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Screw Thread
d		 M5 M6 M8 M10
P Pitch 0.8 1 1.25 1.5
Length of Thread
b		 L≤125 16 18 22 26
125＜L≤200 22 24 28 32
L＞200 / / 41 45
dk max 13.55 16.55 20.65 24.65
min 12.45 15.45 19.35 23.35
ds max 5 6 8 10
min 4.52 5.52 7.42 9.42
k1 max 4.1 4.6 5.6 6.6
min 2.9 3.4 4.4 5.4
k max 3.3 3.88 4.88 5.38
min 2.7 3.12 4.12 4.62
r1 ≈ 10.7 12.6 16 19.2
r2 max 0.5 0.5 0.5 0.5
r3 max 0.75 0.9 1.2 1.5
s max 5.48 6.48 8.58 10.58
min 4.52 5.52 7.42 9.42

Screw Thread
d		 M12 M16 M20
P Pitch 1.75 2 2.5
Length of Thread
b		 L≤125 30 38 46
125＜L≤200 36 44 52
L＞200 49 57 65
dk max 30.65 38.8 46.8
min 29.35 37.2 45.2
ds max 12 16 20
min 11.3 15.3 19.16
k1 max 8.75 12.9 15.9
min 7.25 11.1 14.1
k max 6.95 8.95 11.05
min 6.05 8.05 9.95
r1 ≈ 24.1 29.3 33.9
r2 max 1 1 1
r3 max 1.8 2.4 3
s max 12.7 16.7 20.84
min 11.3 15.3 19.16



b1 for L ≤ 125 mm
b2 for L ≤ 200 mm
b3 for L > 200 mm


All information is strictly informative