Double Hex
No failure report names the double hex. 8 FAA approvals let 5 companies make a replacement double hex, Sps Technologies INC holding the most (3).
Approved replacement parts 8 parts manufacturer approvals
A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a double hex and sell it as an approved part for the models named. These are the companies holding such approvals for a double hex:
| Maker | Part | Replaces | Fits | Granted | Status |
|---|---|---|---|---|---|
| Aerocess, INC | Double Hex Nut ALCH7461T | 784776-1 | Hamilton Standard 14SF-5, -7, -11 | 2020-03-04 | current |
| Turbine Kinetics INC, Subsidiary of Heico CORP | Double Hex Head Machine Bolt DNJ646P21B | J646P21B | General Electric CF6-80C2A1, CF6-80C2A2, CF6-80C2A3 | 2012-07-30 | current |
| Turbine Kinetics INC, Subsidiary of Heico CORP | Double Hex Head Machine Bolt DNJ646P21B | J646P21B | General Electric CF6-80C2 Series Engines | 2008-08-24 | current |
| Valtec Aircraft Supply | Double Hex Nut VL1115HS9 | 784776-1 | Hamilton Standard Division 14SF-7, 14RF-9, 247-1E | 2004-02-09 | current |
| Alcoa Fastening Systems | Double Hex Self-Locking Nut VN4722WA02 | I/C 564707, Detail 789516 | Pratt & Whitney JT9D-59A, -7Q, -7Q3 | 2002-10-27 | current |
| Sps Technologies INC | Double Hex Self-Locking Nut SPS 83456-428 | Pratt &Whitney ST1485-10 | Pratt & Whitney Canada F117-PW-100 | 2001-07-28 | current |
| Sps Technologies INC | Double Hex Self-Locking Nut 59872-428 | 490272 | Pratt & Whitney JT9D-7Q, JT9D-7Q3, JT9D-7R4D | 2000-12-12 | current |
| Sps Technologies INC | Double Hex Self-Locking Nut 59872-624 | 541811 | Pratt & Whitney JT9D-7Q, JT9D-7Q3, JT9D-7R4D | 2000-12-12 | current |
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.