Generac Part #0K0435, Pressure Washer Ribbed Shank Fastener | 5.00 x 0.50 x 1.00. This ribbed shank fastener (part number 0K0435) is for pressure washers. Follow appropriate safety practices when installing ribbed shank fastener 0K0435.... - Generac Part #0K0435, Pressure Washer Ribbed Shank Fastener | 5.00 x 0.50 x 1.00.