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 5999-01-301-8926
NSN 6645-00-779-5355
NSN 5965-01-433-9864
NSN 5910-01-169-9944
NSN 7035-00-763-6180
NSN 6685-01-623-3467
NSN 6320-01-111-8851
NSN 5965-01-475-0666
NSN 6320-01-473-9024
NSN 6685-01-024-5644
NSN 6145-01-436-8989
NSN 6610-00-556-1870