MS21042-4 self-locking elastic stop nut, 1/4-28 thread. All-metal nylon insert design approved for flight-critical applications. Used throughout Van's RV control system (aileron pushrods, elevator torque tube, rudder cables). Per RV-7A and RV-9A maintenance manual and multiple Van's SBs. Pack of 25.
| Material | Alloy Steel / Nylon |
| Finish | Cadmium Plated |
| Thread | 1/4-28 |
| Size | 1/4-28 |
| Diameter | 1/4" |
| Pack Qty | 25 pieces |
| Spec Type | MS |
| Category | Nut |
Traceability & Certification — All Aerospace Spec Bolt hardware is sourced from certified surplus. FAA Form 8130-3 Airworthiness Approval Tags and/or Certificate of Conformance documentation available on request. Parts are inspected prior to sale. Ships from Pembroke Pines, FL.
Ships 1–2 business days. Questions? specbolt@polsia.app