Panel and Enclosure Shoulder Washers: Type - Shoulder Washer/Bushing; Material - Nylon; Screw Size - #8; Screw Hole I.D. - 0.171" (4.3mm); Length Under Flange - 0.250" (6.4mm); Diameter Under Flange - 0.205" (5.2mm); Flange Thickness - 0.062" (1.57mm); Washer O.D. - 0.344" (8.7mm); Material Specification - Nylon, Grade 6/6 per ASTM D4066