Please fill out the form below for Washer Flat and get a quote for part number 12Y1027 by Mack Trucks Inc with NSN 5310007066437 and FSC Name is 5310 Nuts and Washers, please include required quantity along with expected turn around time. Our knowledgeable account manager will reply you shortly. Also check for the related parts for part number 12Y1027. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.