DIN 188

T-head bolts with double nib

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Screw Thread
d		 M8 M10 M12
P Pitch 1.25 1.5 1.75
Length of Thread
b		 b1 22 26 30
b2 28 32 36
b3 / / 49
ds max 8.58 10.58 12.7
min 7.42 9.42 11.3
k max 5.9 7.45 8.75
min 5.1 6.55 7.25
n max 8.75 10.75 12.9
min 7.25 9.25 11.1
m max 18.9 22 27
min 17.1 20 25
r1 ≈ 0.5 0.5 1
r2① max 1.2 1.5 1.8

Screw Thread
d		 M16 M20 M24
P Pitch 2 2.5 3
Length of Thread
b		 b1 38 46 54
b2 44 52 60
b3 57 65 73
ds max 16.7 20.84 24.84
min 15.3 19.16 23.16
k max 11.4 13.9 15.9
min 9.6 12.1 14.1
n max 16.9 21 25
min 15.1 19 23
m max 31 37.25 44.25
min 29 34.75 41.75
r1 ≈ 1 1 1.6
r2① max 2.4 3 3.6

Screw Thread
d		 M30 M36 M42
P Pitch 3.5 4 4.5
Length of Thread
b		 b1 66 78 /
b2 72 84 96
b3 85 97 109
ds max 30.84 37 43
min 29.16 35 41
k max 20 24 27
min 18 22 25
n max 31 37.25 43.25
min 29 34.75 40.75
m max 55.5 67.5 81.5
min 52.5 64.5 78.5
r1 ≈ 1.6 2 2
r2① max 4.5 5.4 6.3

Screw Thread
d		 M48 M56 M64
P Pitch 5 5.5 6
Length of Thread
b		 b1 / / /
b2 108 124 130
b3 121 137 143
ds max 49 57.2 65.2
min 47 54.8 62.8
k max 31 36.25 41.25
min 29 33.75 38.75
n max 49.25 57.5 65.5
min 46.75 54.5 62.5
m max 89.75 103.75 116.75
min 86.25 100.25 113.25
r1 ≈ 2 3 3
r2① max 7.2 8.4 9.6

Screw Thread
d		 M72 M80
P Pitch 6 6
Length of Thread
b		 b1 / /
b2 156 172
b3 169 185
ds max 73.2 81.2
min 70.8 78.8
k max 46.25 51.25
min 43.75 48.75
n max 73.5 81.5
min 70.5 78.5
m max 130 142
min 126 138
r1 ≈ 4 4
r2① max 10.8 12



b1 for L ≤ 120 mm
b2 for 120 mm < L ≤ 200 mm
b3 for L > 200 mm


All information is strictly informative