4-40 sst; t.O. 12r5-4-129-11, fig 3-2, ind 8
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: Nuts of iron or steel
NSN 6150-01-548-3581
NSN 6135-01-485-9082
NSN 6685-00-598-1944
NSN 6320-01-512-2031
NSN 6150-00-826-9502
NSN 5985-01-082-7320
NSN 5996-00-151-4462
NSN 6145-00-496-2020
NSN 6620-01-504-5756
NSN 5855-01-634-0259
NSN 5965-01-397-7544
NSN 6645-00-612-7732