0.250 tap through center of a flat to id
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.)
Classification: Copper screws, nuts, bolts, rivets, and other fasteners not threaded
NSN 6110-01-393-0895
NSN 4140-01-476-7526
NSN 2925-01-257-6225
NSN 5999-01-218-5740
NSN 5945-01-090-0610
NSN 6110-00-620-0330
NSN 6620-00-253-6329
NSN 6240-01-411-6902
NSN 6240-01-415-5581
NSN 6645-00-784-8288
NSN 5915-01-051-6068
NSN 5895-01-020-7771