Nut has 3 round indentations equally spaced around the flats
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 6105-00-878-9445
NSN 6610-01-416-0103
NSN 7035-00-834-2090
NSN 5915-01-196-1846
NSN 5998-01-210-8371
NSN 6220-01-651-9331
NSN 5996-01-078-8440
NSN 5960-01-170-4057
NSN 6110-01-567-7214
NSN 6620-00-485-4136
NSN 5985-01-595-2224
NSN 5990-01-139-6042