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Hex Key Vs. Allen Wrench: Is There A Difference?

Because of its small size, high torque strength, and recessed installation, the hex socket screw is a great alternative to regular bolts. The main tool used to tighten or loosen hex socket screws is ...
insider.si.edu

[Trade catalogs on aircraft hardware : hexagonal bolts, clevis bolts, castellated nuts, threaded taper pins, clevis pins, threaded rod ends, drilled fillister head machine ...

https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!718222~!0#focus ...