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 5920-01-621-8557
NSN 6145-00-275-4046
NSN 4140-01-567-8378
NSN 6645-01-117-6156
NSN 2925-01-550-0177
NSN 5920-01-217-1637
NSN 5905-00-391-6398
NSN 6110-00-916-4625
NSN 6685-00-054-0796
NSN 5855-00-688-9954
NSN 6135-00-246-0324
NSN 6220-01-600-2860