Mark IV™ Structural Panel Fastener

A Structural Panel Fastening System for Aerospace Composite Structures

System Features
  • Comprised of a two piece design: a flat beam lock nut that provides excellent resistance to vibration-induced loosening and has a high cycle life of up to 250 seated cycles, and a stud bolt which features dual - lead threads for quick operation.
  • 100º countersink tension head with multiple recess options available including hex and Torx®.
  • Stud bolt available in .2160, .2500, .3125 and .3750 inch nominal diameters.
  • Stud bolt has positive retention and hold-out.
  • Stud bolt offers excellent probability and accomodates angular panel misalignment with the unthreaded nose section.
  • Stud bolt accommodates large variations in grip (up to .140 inch).
  • Receptacle provides .020 inch minimum radial float and versions allow for angular engagement of nut plate to ease installation of curved panels.
  • Receptacle nut portion can be replaced without removing rivets.
  • Optional grommet for composite applications provides hard seat surface, good load transfer, counterbore for retaining ring, and is excellent for gasketed applications.

Contact Information

Americas, Asia, and Pacific

Americas, Asia, and Pacific
Technical Support
+1 310 784 2652

Europe and Middle East
Sales and Technical Support
+49 8251 8757-0
+49 8251 1652