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 6320-01-550-3420
NSN 5930-01-494-9187
NSN 5950-00-699-6466
NSN 5895-00-186-1260
NSN 5895-01-474-7323
NSN 5915-00-351-7355
NSN 7035-01-425-4496
NSN 5915-01-575-1745
NSN 7035-01-421-2398
NSN 5925-00-016-3758
NSN 6320-01-255-2096
NSN 5945-01-187-6424