About Electronic Flat Washers Accurate Screw Machine offers fast delivery of all sizes (Metric & Standard) of stock Belleville, "Spring Steel", counterbore, cylindrically curved, finishing, flat, flat lock, panel screw, panel screw retainer, metric panel screw retainer, shoulder and wave washers and other electronic hardware in large, small or prototype lots. We serve the computer, consumer electronics, aerospace, medical, telecommunication equipment manufacturing and the metal fabricating industries. Off-the-shelf orders are usually filled the same day, custom orders are usually completed in one week or less.