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 6645-00-121-7566
NSN 5965-01-500-1840
NSN 5895-01-190-7753
NSN 6105-01-231-2366
NSN 5999-00-110-5015
NSN 6135-01-595-4779
NSN 6145-01-499-6520
NSN 6105-00-418-3654
NSN 5855-01-476-0941
NSN 6320-01-328-6575
NSN 5999-01-245-6763
NSN 5910-01-552-4362