Please fill out the form below for Ss By 502997 5 and get a quote for part number 502997-4 by Unison Industries 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 502997-4. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.