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 5999-01-152-8055
NSN 6105-01-519-6090
NSN 5910-00-829-8739
NSN 5930-00-533-9792
NSN 6320-00-379-4695
NSN 6150-00-328-8989
NSN 6320-00-557-3079
NSN 5945-01-388-0856
NSN 6240-01-126-9167
NSN 6610-00-587-3260
NSN 6240-00-344-8582
NSN 5960-01-103-5476