4 holes equally spaced on 3.440 bcd; each is .397
A nut, circular in shape, which may have wrenching facilities such as flats, holes, protrusions, slots or splines in or on the periphery or in the face opposite the bearing surface. For items having a thickness (or height) exceeding two times the outside diameter, use post, electrical-mechanical equipment. See also nut (1), plain, knurled. (when height or thickness and/or outside diameter is designated as a tolerance dimension, the maximum dimension will be used to determine compliance.)
NSN 5935-00-527-3826
NSN 5960-01-140-4253
NSN 5925-01-254-4781
NSN 6610-00-738-7704
NSN 5990-01-503-9804
NSN 5930-01-578-4609
NSN 6240-01-473-3781
NSN 5965-00-223-6354
NSN 6130-01-138-8354
NSN 5935-00-104-5742
NSN 6135-01-504-4309
NSN 6220-00-276-8681