Please fill out the form below for Nut 1 Or 4 28Unf Stiff and get a quote for part number MS21042-4 by Contour Engineering Llc, 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 MS21042-4. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.