The U.S. aircraft register, updated daily
Parts

Machined Axle

No failure report names the machined axle. 1 FAA approvals let 1 company make a replacement machined axle, Safe Air Repair INC holding the most (1).

Approved replacement parts 1 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a machined axle and sell it as an approved part for the models named. These are the companies holding such approvals for a machined axle:

For these models most: American Champion Aircraft 7 Citabria and Champ (1).

MakerPartReplacesFitsGrantedStatus
Safe Air Repair INCMachined Axle Tube SAR 3-559American Champion 3-559American Champion 7AC, 11AC, 11BC1993-04-21current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.