Used on h-3 helicopter
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 5925-00-336-1992
NSN 6685-01-227-2621
NSN 6645-01-305-4068
NSN 6685-01-529-3203
NSN 6320-00-456-0836
NSN 2925-01-446-6976
NSN 6145-01-055-8851
NSN 5915-01-135-0630
NSN 5985-01-541-4797
NSN 5905-01-350-8480
NSN 5935-01-032-3494
NSN 5930-01-166-1507