Flat washers help to spread the load of metal fasteners, providing extra protection against pull-through, and protecting the surface from marring when the fastener is tightened down. Note: Listed dimensions indicate what size bolt the washer is compatible with, not the diameter of the washer.Technical Details:
- Inner diameter of 1/4" SAE Flat Washer: 9/32".
- Outer diameter of 1/4" SAE Flat Washer: 5/8".
- Inner diameter of 5/16" SAE Flat Washer: 11/32".
- Outer diameter of 5/16" SAE Flat Washer: 11/16".
- Approximately 0.065" thick.