Please fill out the form below for Nut Plain Hexagon and get a quote for part number 1 4-20 UNC-2B MACH SCR NUT by American Society For Testing And with NSN 5310013588422 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 1 4-20 UNC-2B MACH SCR NUT. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.