Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 34-031 found under Washer Spring Med by Spectrum Pressurestat Co Inc. The National Stock Number assigned to this part is 5310011899708, and the Federal Supply Class is 5310 Nuts And Washers. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 34-031.