DIN 186

T-heads bolts

Type B = with square neck and long thread





Screw Thread
d		 M6 M8 M10
P Pitch 1 1.25 1.5
ds Nominal Size 6 8 10
max 6.48 8.58 10.58
min 5.52 7.42 9.42
k Nominal Size 4.5 5.5 7
max 4.9 5.9 7.5
min 4.1 5.1 6.5
n Nominal Size 6 8 10
max 6.6 8.75 10.75
min 5.4 7.25 9.25
m Nominal Size 16 18 21
min 15.1 17.1 20
max 16.9 18.9 22
r1 ≈ 0.5 0.5 0.5
r2 max 0.9 1.2 1.5
Length of Thread
b		 b1 18 22 26
b2 24 28 32
b3 37 41 45

Screw Thread
d		 M12 M16 M20
P Pitch 1.75 2 2.5
ds Nominal Size 12 16 20
max 12.7 16.7 20.84
min 11.3 15.3 19.16
k Nominal Size 8 10.5 13
max 8.75 11.4 13.9
min 7.25 9.6 12.1
n Nominal Size 12 16 20
max 12.9 16.9 21
min 11.1 15.1 19
m Nominal Size 26 30 36
min 25 29 34.75
max 27 31 37.25
r1 ≈ 1 1 1
r2 max 1.8 2.4 3
Length of Thread
b		 b1 30 38 46
b2 36 44 52
b3 49 57 65

Screw Thread
d		 M24 M30 M36
P Pitch 3 3.5 4
ds Nominal Size 24 30 36
max 24.84 30.84 37
min 23.16 29.16 35
k Nominal Size 15 19 23
max 15.9 20 24
min 14.1 18 22
n Nominal Size 24 30 36
max 25 31 37.25
min 23 29 34.75
m Nominal Size 43 54 66
min 41.75 52.5 64.5
max 44.25 55.5 67.5
r1 ≈ 1.6 1.6 2
r2 max 3.6 4.5 5.4
Length of Thread
b		 b1 54 66 78
b2 60 72 84
b3 73 85 97

Screw Thread
d		 M42 M48
P Pitch 4.5 5
ds Nominal Size 42 48
max 43 49
min 41 47
k Nominal Size 26 30
max 27 31
min 25 29
n Nominal Size 42 48
max 43.25 49.25
min 40.75 46.75
m Nominal Size 80 88
min 78.5 86.25
max 81.5 89.75
r1 ≈ 2 2
r2 max 6.3 7.2
Length of Thread
b		 b1 90 102
b2 96 108
b3 109 121



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


All information is strictly informative