Specially designed for solar panel mounting. This washer is perfect for holding down solar panels.
Very strong washer! When properly installed, the holding force of this 1/4" thick washer far exceeds the frame strength of your panel.
This washer locks into place within the unistrut rails and will not turn past a certain point which allows easy tightening of the screw or bolt from atop of the panel.
Can be used as a general flat Unistrut non rusting lock washer (bottom washer) as well.