Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 45H10-3-550-3 found under Coupling Clamp Groo by Grimes Aerospace Company. The National Stock Number assigned to this part is 5342010158964, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 45H10-3-550-3.