Part Number 991-4-00073-027 Screw 6Ba X 3 16 Long Brass in stock with ready to ship. Get an instant quote for Eaton Aviation Corporation part number 991-4-00073-027 by filling form below with your desired order quantity, targeted price and the expected order-fulfilment date. Get instant quote for 991-4-00073-027. Our dedicated account manager will get back to you within 15 minutes.