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 5996-01-633-7979
NSN 5915-00-275-4247
NSN 6145-01-520-6407
NSN 6320-00-593-0379
NSN 5965-01-605-0090
NSN 5985-01-363-4257
NSN 5935-00-396-1327
NSN 5930-01-574-6505
NSN 5975-00-982-6209
NSN 5945-00-968-3159
NSN 5950-01-388-3753
NSN 5920-00-156-5743