Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ET20L10 found under Torque Limiter Fastener Installa by Avibank Mfg Inc. The National Stock Number assigned to this part is 5120013837935, and the Federal Supply Class is 5120 Hand Tools Nonedged Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like ET20L10.