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 6220-01-512-0144
NSN 5945-01-607-7245
NSN 5999-00-813-8316
NSN 5985-01-147-5238
NSN 6150-00-045-3900
NSN 6645-00-641-3202
NSN 5925-01-661-0259
NSN 5905-01-100-7825
NSN 6645-00-925-2887
NSN 5915-00-856-2916
NSN 5835-01-498-9410
NSN 6105-01-436-0864