Washer Head Bolts

Washer head bolts are used when the head of the bolt sits flush to a wooden member. The forged washer side provides a larger bearing surface so that when the bolt is tightened, the wood underneath the head is not damaged. Washer head bolts have an added semi-cone point and a thread length unique to pole line fasteners depending on the length of the bolt. Washer head bolts normally have a square nut assembled, but can also have a hex nut assembled.

Washerhead Bolt Drawing

Click table to show drawing
Bolt Diameter D H W B C F
Body Diameter Height (Head) Height (Washer) Outside Diameter (Washer) Width Across Corners (Head) Width Across Flats (Head)
Max Min Basic Max Min
1⁄2 0.515 0.290 0.130 1.40 1.061 0.995 3⁄4 0.750 0.725
5⁄8 0.642 0.420 0.125 1.80 1.326 1.244 15⁄16 0.938 0.906
3⁄4 0.768 0.490 0.110 2.20 1.591 1.494 11⁄8 1.125 1.088
7⁄8 0.895 0.640 0.180 2.60 1.856 1.742 15⁄16 1.312 1.269

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"