Please fill out the form below for Nut and get a quote for part number A1639-1 by Mccauley Propeller, 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 A1639-1. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.