Nha is shackle, p/n 6kk562
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 5999-00-018-0708
NSN 6620-00-078-4470
NSN 6135-00-274-4037
NSN 6645-01-164-7650
NSN 5930-00-222-6187
NSN 2925-00-833-9466
NSN 6135-01-334-3935
NSN 6150-01-069-8647
NSN 6645-00-358-7379
NSN 6220-01-346-1285
NSN 6320-01-160-8578
NSN 6645-01-163-9930