Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12018 found under Gage Screw Pitch by Irwin Industrial Tool Company. The National Stock Number assigned to this part is 5210016445512, and the Federal Supply Class is 5210 Measuring Tools Craftsmens. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 12018.