Please fill out the form below for Helicoil 1 4 28 Unf X 500 Af and get a quote for part number HL1 428UNFX-500 by Zodiac Aerospace, 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 HL1 428UNFX-500. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.