Do not dupe to nsn 5310-00-903-5966; this nsn is for pearl harbor use only; this is a non-standard unit-of-issue
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 5985-01-100-1039
NSN 6105-01-542-6846
NSN 7035-01-426-4133
NSN 6620-00-246-5159
NSN 6320-01-384-3219
NSN 6135-01-485-3450
NSN 5855-01-020-7982
NSN 6645-01-467-9983
NSN 4140-01-444-5292
NSN 5950-01-216-8289
NSN 6150-01-122-8644
NSN 5915-01-360-7457