Item is made from p/n: 321dc0006 .9985-1.000 diameter 1050 1000hr/100k. The width across the flats measurements only happens twice, making the stud square.
A headless fastener not exceeding 12 inches (304.8 mm) in length, threaded externally on both ends with threads of the same nominal diameter. All or part of the unthreaded section has a cross-sectional diameter greater than the nominal stud size plus 0.020 inches (0.508 mm). It may be thread relieved. See also stud, locked in.
NSN 6150-01-240-6638
NSN 7035-00-565-9623
NSN 5920-01-282-7409
NSN 5985-00-186-8755
NSN 5945-01-117-4760
NSN 6145-00-225-8709
NSN 6650-01-598-0815
NSN 5996-01-384-2115
NSN 5835-01-632-6627
NSN 6320-00-433-2773
NSN 2925-01-633-4048
NSN 5996-00-727-1470