Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 31B1 found under Sleeve Jack Tip by Grayhill Inc. The National Stock Number assigned to this part is 5935009623332, and the Federal Supply Class is 5935 Connectors Electrical. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 31B1.