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Forged washer head bolts perform the same function of standard bolt, except more efficiently because of the increased bearing surface on the cross arm. Lock nuts are often used to ensure a secure connection.
Portland Bolt manufactures washer head bolts from 1/2" diameter through 7/8" diameter. These bolts are manufactured to ASTM 307A. They are forged with a square head and large washer surface under the head. All processes including hot-dipped galvanizing are performed in-house.
| 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 | 1-1/8 | 1.125 | 1.088 |
| 7/8 | 0.895 | 0.640 | 0.180 | 2.60 | 1.856 | 1.742 | 1-15/16 | 1.312 | 1.269 |
