Please fill out the form below for Butterfly Disk and get a quote for part number 3121-20417 by Nord Micro Ag And Co Ohg, 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 3121-20417. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.