Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1H4055 found under Gear 1St 2Nd by Caterpillar Inc. The National Stock Number assigned to this part is 3020010898562, and the Federal Supply Class is 3020 Gear Pulley Sprocket And Transmission Chain. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 1H4055.