Metric coarse threads
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 5905-01-213-4138
NSN 6685-01-033-1436
NSN 5990-00-888-0718
NSN 5895-01-099-8589
NSN 5999-00-162-1913
NSN 2925-00-452-6403
NSN 6135-01-400-2947
NSN 5998-01-333-8775
NSN 6145-01-640-9122
NSN 6145-00-116-0507
NSN 6135-01-100-3593
NSN 6105-01-609-4031