Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B74.2 TY1 found under Wheel Abrasive by American Society Of Mechanical. The National Stock Number assigned to this part is 5130000632923, and the Federal Supply Class is 5130 Hand Tools Power Driven. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B74.2 TY1.