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Description:
A round head bolt with a flat bearing surface which intersects with the shank at a 90° angle. Where the bearing surface and shank
meet are two fins, 180° opposite each othe. The bolt is made from low carbon steel.
Advantages:
Primarily used in thin plywood to keep the bolt from turning when nut is being tightened.
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Carriage Bolt Fin Neck
CARRIAGE BOLTS, FIN NECK ASME B18.5-1990 |
Nominal Size
or Basic Bolt
Diameter
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A |
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Fin Thickness |
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Min |
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Min |
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Min |
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Min |
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0.1900 |
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0.182 |
0.469 |
0.438 |
0.114 |
0.094 |
0.098 |
0.078 |
0.395 |
0.375 |
0.088 |
0.076 |
0.031 |
0.015 |
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0.2500 |
0.260 |
0.237 |
0.594 |
0.563 |
0.145 |
0.125 |
0.114 |
0.094 |
0.458 |
0.438 |
0.104 |
0.094 |
0.031 |
0.015 |
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0.3125 |
0.324 |
0.298 |
0.719 |
0.688 |
0.176 |
0.156 |
0.145 |
0.125 |
0.551 |
0.531 |
0.135 |
0.125 |
0.031 |
0.015 |
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0.3750 |
0.388 |
0.360 |
0.844 |
0.782 |
0.208 |
0.188 |
0.161 |
0.141 |
0.645 |
0.625 |
0.151 |
0.141 |
0.031 |
0.015 |
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0.4375 |
0.452 |
0.421 |
0.969 |
0.907 |
0.239 |
0.219 |
0.192 |
0.172 |
0.739 |
0.719 |
0.182 |
0.172 |
0.031 |
0.015 |
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0.5000 |
0.515 |
0.483 |
1.094 |
1.032 |
0.270 |
0.250 |
0.208 |
0.188 |
0.833 |
0.813 |
0.198 |
0.188 |
0.031 |
0.015 |
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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. |
#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 |
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Email: 
sales@fastenerz.com
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