1/4"-20 Carriage Bolt Hot Dipped Galvanized 307A Grade A

1/4"-20 Hot Dip Galvanized Carriage Bolt

Diameter - Thread Pitch: 1/4-20


1/4"-20 Hot dipped galvanized carriage bolts have a domed or countersunk head, and the shank is topped by a short square section under the head.

  • Square section grips into the part being fixed (typically wood)
  • Prevents the bolt from turning when the nut is tightened
  • Carriage Bolts under 6 inches are fully threaded
  • Sizes over 6 inches in length have a shoulder
  • Coarse Thread
Hot Dipped Galvanized assemblies should be used exclusively. If you use a HDG bolt you must also use a HDG nut.


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Product Specifications
Body Diameter
1/4" (Max 0.260 - Min 0.237)
Color
Gray
Corner Radius on Square
0.031"
Corrosion Resistant
Yes
Filet Radius
0.031"
Finish
Hot Dip Galvanized
Head Diameter
Max 0.594 - Min 0.563
Head Style
Domed
Material
Steel
Other
All Carriage Bolts under 6 inches are fully threaded. Sizes over 6 inches in length have a shoulder.
Overall Head Height
Max 0.145 - Min 0.125
Product Type
Carriage Bolt
Square Neck Depth
Max 0.156 - Min 0.125
Square Neck Width
Max 0.260 - Min 0.245
Thread Direction
Right Hand
Thread Pitch (Count)
20 Per Inch
Thread Standard
UNC
Thread Type
Coarse
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
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