Part Number 1 4STCP having (CAGE Code 91723) and FSC 5310 Nuts and Washers in stock with ready to ship. Get an instant quote for 1 4STCP Washer Flat by Georator Corporation The. 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.