Part Number 4-24521 having (CAGE Code 0SE35) and FSC 5310 Nuts and Washers in stock with ready to ship. Get an instant quote for 4-24521 Washer Flat by Boll Filter Corporation Use Cage. Fill the form below with your desired order quantity, targeted price and the expected order-fulfilment date. Our dedicated account manager will get back to you within 15 minutes.