A nut having 6 flat sides and an integral washer which extends beyond the flats or periphery.
NSN 5998-00-018-9706
NSN 5915-01-189-4248
NSN 5990-00-539-7859
NSN 5905-01-375-9444
NSN 6150-01-093-5254
NSN 6220-00-285-8104
NSN 6145-01-145-1867
NSN 6645-01-554-9772
NSN 5965-01-154-6319
NSN 6135-01-204-8712
NSN 4140-00-627-9588
NSN 5996-01-069-6806