You never think about washers until you run out of them, but they are vital for a dozen different applications. Ensure a tighter join with a lock washer, or pre-load it with a wave washer. Don't forget an insulating flat washer to prevent galvanic corrosion if you have steel screws on an aluminum surface, or a countersunk washer for that finished appearance. Stock up now on washers at Fujifastener.