Carriage Bolt Square Neck, Grade 5
GRADE-5 CARRIAGE BOLT ASME B18.5-1990 |
Nominal Size
or Basic Bolt
Diameter
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Square Width |
Square Depth |
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Min |
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Min |
•8 |
0.1640 |
0.173 |
0.157 |
0.328 |
0.298 |
0.102 |
0.083 |
0.169 |
0.155 |
0.108 |
0.078 |
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0.185 |
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0.094 |
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0.245 |
0.156 |
0.125 |
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0.324 |
0.307 |
0.187 |
0.156 |
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0.368 |
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0.188 |
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0.431 |
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0.219 |
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0.515 |
0.492 |
0.281 |
0.250 |
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0.642 |
0.616 |
0.344 |
0.313 |
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0.768 |
0.741 |
0.406 |
0.375 |
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Tolerance on Length |
Nominal Bolt Size |
Nominal Bolt 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. 8 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 |
‡Length of a carriage bolt is measured from the underhead bearing surface to the extreme
end of the bolt.
• ASME B18.5-1990 does not specify dimensions for the #8 diameter. Data listed for this size is independent of the ASME specification.
**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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