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Drilled for lock wire.
| Thread | Locking | Flush Mounted | Open Action | Use Pin Type Cup | Material | Approval |
| 1/2-20 UNF | No | Yes | Push | Yes | Brass, Unplated | FAA-TSO-C76 |
Thread: "UNF" (Fine thread) type are straight, non-sealing threads that rely on an o-ring to provide a seal. "NPT" (Pipe thread) type are tapered thread that seal as they are tightened.
