Please fill out the form below for Channel Structural and get a quote for part number ASTM-A479 1.75X4X.25THK CL304 by American Society For Testing And with NSN 9520012415212 and FSC Name is 9520 Structural Shapes, 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 ASTM-A479 1.75X4X.25THK CL304. ASAP Aerospace distributes nose to tail NSN components, sub-assemblies, and assemblies for the aerospace and aviation industry.