The U.S. aircraft register, updated daily
Parts

Washer Countersink

No failure report names the washer countersink. 1 FAA approvals let 1 company make a replacement washer countersink, Freshlink LTD 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 washer countersink and sell it as an approved part for the models named. These are the companies holding such approvals for a washer countersink:

MakerPartReplacesFitsGrantedStatus
Freshlink LTDWasher-Countersink Plug, Standard Inside Diameter AM2002 - ( ) (dash numbers...Lockheed LS5931Lockheed L-10112003-03-04current

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.