Our V-Flange CAT 40 blanks are machined from mill certified AISI 4150 preheated-treated alloy steel. The body is hardened to 28-32 RC to allow for easy machinability and post flame hardening for those special pockets and features. Manufactured in accordance with ASME B5.50 standard (Per ISO-1947) the 7/24 taper is hardened to 56-60 RC and...
