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.)
Dept. of the Navy NSN 5915-01-577-4016
NSN 5985-01-623-1371
NSN 6685-01-092-9022
NSN 6135-00-243-8330
NSN 6645-01-029-4525
NSN 6110-01-101-1181
NSN 2925-01-359-4027
NSN 5905-01-065-4069
NSN 6240-00-197-6819
NSN 6150-00-949-5858
NSN 7035-00-870-0290
NSN 6110-01-215-0598