Carriage Bolts

Carriage Bolt Drawing

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Bolt Diameter D C H P F
Body Diameter Head Diameter Head Height Square Width Square Depth
Max Min Max Min Max Min Max Min Max Min
1⁄2 0.515 0.483 1.094 1.032 0.270 0.250 0.515 0.492 0.281 0.250
5⁄8 0.642 0.605 1.344 1.219 0.344 0.313 0.642 0.616 0.344 0.313
3⁄4 0.768 0.729 1.594 1.469 0.406 0.375 0.768 0.741 0.406 0.375
7⁄8 0.895 0.852 1.844 1.719 0.469 0.438 0.895 0.865 0.469 0.438
1 1.022 0.976 2.094 1.969 0.531 0.500 1.022 0.990 0.531 0.500
11⁄4* 1.277 2.850 0.531 0.500 1.250 0.625
*Dimensions per ASME B18.5 1990 (R 1998) cover diameters up to 1". Bolts over 1" use custom head dimensions.

Standard Thread Lengths

*Bolts shorter and/or smaller than those listed in the table shall have minimum thread lengths in accordance with American National Standard for Square and  Hex Bolts and Screws, B18.2.1*
Diameters Bolt length Thread length
  • 3/8"
  • 1/2"
  • 5/8"
  • 3/4"
  • 7/8"
  • 1"
 4" up to less than 8" 3"
  • 3/8"
  • 1/2"
  • 5/8"
  • 3/4"
  • 7/8"
  • 1"
  • 1-1/4"
 8" up to less than 12" 4"
  • 3/8"
  • 1/2"
  • 5/8"
  • 3/4"
  • 7/8"
  • 1"
  • 1-1/4"
 12" and over 6"