R/B 404-532 (P/N 404-838) - New Surplus

The 404-838 is a self-locking hex nut for Piper aircraft airframe assemblies. This MS21042-style locknut secures threaded fastener joints in structural and system connections. The nut features a nylon insert that prevents vibration-induced loosening during flight and ground operations.

Install per Piper maintenance documentation and AC 43.13-1B torque specifications. Note: This part has been superseded by 404-532; verify current applicability in your aircraft's Illustrated Parts Catalog before installation.

What is the R/B 404-532 (P/N 404-838)?

The 404-838 is a self-locking hex nut for Piper aircraft airframe assemblies. This MS21042-style locknut secures threaded fastener joints in structural and system connections.

What conditions is the 404-838 available in?

The 404-838 is currently available in the following conditions: New Surplus. Each condition reflects the part's maintenance history and certification status per FAA standards.

How do I get pricing for the 404-838?

The 404-838 requires a custom quote. Submit a Request for Quote (RFQ) through our website or call our sales team at (904) 998-9101 for immediate pricing assistance.

Do you offer expedited shipping for the 404-838?

Yes, we offer same-day processing on in-stock items and provide 24/7 AOG (Aircraft on Ground) support for urgent needs. Standard, expedited, and overnight shipping options are available.