Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 691128-3 found under Weight Counterbalance by Smith S R Co Inc. The National Stock Number assigned to this part is 3040011467533, and the Federal Supply Class is 3040 Miscellaneous Power Transmission Equipment. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 691128-3.