Internal drive ribbed
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 6105-01-313-1129
NSN 5996-01-096-6495
NSN 5910-00-857-9192
NSN 6105-00-627-1230
NSN 5998-00-733-7717
NSN 6240-01-311-9751
NSN 6150-00-233-6356
NSN 5910-00-855-5308
NSN 5999-01-138-4977
NSN 2925-00-701-9991
NSN 6645-01-399-0329
NSN 6110-01-310-7995