Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 123MH10239-511 found under Adapter Straight Flange To Tube by Howe Machine And Tool Corp. The National Stock Number assigned to this part is 4730000098996, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 123MH10239-511.