A nut, flat on top and bottom having 6 flat sides. For items which have internal tapered or straight (parallel) pipe threads, specific electrical conduit size designation, and which when installed, provide a method of tightening to lock the connection, see locknut, electrical conduit. See also locknut, tube fitting. For items having a thickness (or height) exceeding two times the width across the flats, use post, electrical-mechanical equipment. (when height or thickness and/or width across the flats is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 6620-01-238-8018
NSN 6620-00-630-2999
NSN 6220-01-390-9538
NSN 5945-01-069-2506
NSN 6240-01-160-7934
NSN 5915-01-027-1407
NSN 6610-01-187-1748
NSN 6240-01-338-4949
NSN 5925-01-196-2083
NSN 6135-01-361-1776
NSN 5895-01-291-3354
NSN 5950-00-149-2009