Description:

A round head bolt with a short, square shoulder under the head, and a unified thread pitch. The bolt is made from low or medium carbon steel.

 

Advantages:

Carriage bolts are designed to keep the bolt from turning when a nut is being tightened. The short neck variety is used in sheet metal where a standard sized neck would create an obstruction.

 

 

Carriage Bolt Short Square Neck

 

 

CARRIAGE BOLTS, SHORT SQUARE NECK ANSI/ASME B18.5
Nominal Size
or Basic Bolt
Diameter
E
A
H
S
N
C
R
Body Diameter
Head Diameter

Head Height

Square Width
Square Depth
Corner
Radius
on
Square
Fillet
Radius
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Max
1/4
0.2500
0.260
0.213
0.594
0.563
0.145
0.125
0.260
0.245
0.124
0.093
0.031
0.031
5/16
0.3125
0.324
0.272
0.719
0.688
0.176
0.156
0.324
0.307
0.124
0.093
0.031
0.031
3/8
0.3750
0.388
0.329
0.844
0.782
0.208
0.188
0.388
0.368
0.156
0.125
0.047
0.031
7/16
0.4375
0.452
0.385
0.969
0.907
0.239
0.219
0.452
0.431
0.156
0.125
0.047
0.031
1/2
0.5000
0.515
0.444
1.094
1.032
0.270
0.250
0.515
0.492
0.156
0.125
0.047
0.031
5/8
0.6250
0.642
0.559
1.344
1.219
0.344
0.313
0.642
0.616
0.187
0.187
0.078
0.062
3/4
0.7500
0.768
0.678
1.594
1.469
0.406
0.375
0.768
0.741
0.187
0.187
0.078
0.062
 
Tolerance on
Length
Nominal Bolt Size
Nominal Screw Length
Up to 1 in., incl.
Over 1 in. to
2 1/2 in., incl.
Over 2 1/2 in. to 4
in., incl.
Over 4 in. to
6 in., incl.
Over 6 in.
No. 10 thru 3/8
+0.02
-0.03
+0.02
-0.04
+0.04
-0.06
+0.06
-0.10
+0.10
-0.18
7/16 and 1/2
+0.02
-0.03
+0.04
-0.05
+0.06
-0.08
+0.08
-0.10
+0.12
-0.18
9/16 thru 3/4
+0.02
-0.03
+0.06
-0.08
+0.08
-0.10
+0.10
-0.10
+0.14
-0.18
7/8 and 1
....
....
+0.08
-0.10
+0.10
-0.14
+0.12
-0.16
+0.16
-0.20
1-1/8 thru 1-1/2
....
....
+0.12
-0.12
+0.16
-0.16
+0.18
-0.18
+0.22
-0.22

 

‡Length of a carriage bolt is measured from the underhead bearing surface to the extreme

end of the bolt.

**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.

 

 

 

 

 

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sales@fastenerz.com


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