Skip to content

Atlas/ TSOA/ TSO-C148

FAA · TSO Authorization

TSO-C148

AIRCRAFT MECHANICAL FASTENERS

Current Issued 03/13/2026 PDF ↗

What is a TSOA?

A Technical Standard Order Authorization is the FAA's permit for a manufacturer to produce equipment that meets a specific TSO standard (avionics, seats, parachutes, GPS receivers, etc.). The TSO sets the performance requirement; the TSOA is the holder's authorization to deliver compliant parts.

Authorized parts (3)

  • Self-Locking Two Lug Radius Base Nut

    K1905-4

  • Hex Beam Lock Nut

    HB57211-( )

  • Self-Aligning/Locking Gang Channel Nut

    G50091-( )P( )-( )