Please fill out the form below for O Ring and get a quote for part number 139 00X3 50-21A7 by Le Joint Francais with NSN 5331143733030 and FSC Name is 5331 O-Ring, 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 139 00X3 50-21A7. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.