Carriage Bolts
Also known as a “coach” bolt, has a domed or countersunk head. The square section under the head grips into the part being fastened preventing the bolt from turning when the nut is tightened.
Cup Square Bolt.png
Diameter
(d)
Pitch
 
dk
 
k
 
f
 
v
 
M5
M6
0.80
1.00
13.55-12.45
16.55-15.45
3.30-2.70
3.88-3.12
4.10-2.90
4.60-3.40
5.48-4.52
6.48-5.52
M8
1.25
20.65-19.35
4.88-4.12
5.60-4.40
8.58-7.42
M10
1.50
24.65-23.35
5.38-4.62
6.60-5.40
10.58-9.42
M12
1.75
30.65-29.35
6.95-6.05
8.75-7.25
12.70-11.30
M16
2.00
38.80-37.20
8.95-8.05
12.90-11.10
16.70-15.30
Carriage Bolts Specs.jpg
c000400050001_carriage-bolts-full-thread