The U.S. aircraft register, updated daily
Parts

Washer Serrated

No failure report names the washer serrated. 2 FAA approvals let 2 companies make a replacement washer serrated, Air Spares INC holding the most (1).

Approved replacement parts 2 parts manufacturer approvals

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

For these models most: Mcdonnell Douglas DC-10 (1), Boeing 727 (1).

MakerPartReplacesFitsGrantedStatus
Air Spares INCWASHER-SERRATED 69-39611-169-39611-1Boeing 727-200 SERIES, 727-200F SERIES2010-05-13current
Air Concepts InternationalWasher-Serrated Lavatory Attachment 1061-1McDonnell/Douglas AWD7255-1McDonnell Douglas DC-10-10 Series, DC-10-30 Series,...1998-07-21current

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.