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 bolts length. Washer head bolts normally have a square nut assembled, but can also have a hex nut assembled.
|Body Diameter||Height (Head)||Height (Washer)||Outside Diameter (Washer)||Width Across Corners (Head)||Width Across Flats (Head)|
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|
||4" up to less than 8"||3"|
||8" up to less than 12"||4"|
||12" and over||6"|