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 6130-01-154-5619
NSN 4140-01-163-1557
NSN 5945-01-510-9223
NSN 6145-00-112-0459
NSN 5910-01-395-9866
NSN 5910-01-123-9556
NSN 5930-01-437-3539
NSN 5996-01-275-5712
NSN 5835-01-432-8801
NSN 6685-01-433-3745
NSN 6620-00-834-9430
NSN 6240-01-133-8461