Identify with black dye or paint on thread end
A screw, machine or screw, cap, socket head whose unthreaded portion is of specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001 in.) (0.025 mm) or less of a specific diameter for items (1.000 in.) (25 mm) or less in diameter. Items over (1.000 in.) (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015 in.) (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001 in.) (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the screw thread standards, fed std h28 and/or other nationally recognized standards. The head is designed to be held or driven with an inserted driver. It is not designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads.
Classification: Zirconium and articles thereof nesoi
NSN 6645-01-609-0332
NSN 5950-00-406-8883
NSN 5999-01-129-6461
NSN 5950-01-350-3702
NSN 5915-01-424-6958
NSN 5996-01-164-6758
NSN 6685-00-787-8594
NSN 5935-00-238-8934
NSN 5996-00-073-2659
NSN 5910-00-846-6977
NSN 6110-00-764-7621
NSN 6620-01-135-7846