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 5925-01-275-1955
NSN 5975-00-527-9656
NSN 5895-01-097-8737
NSN 6645-01-039-0058
NSN 5960-01-332-9695
NSN 5950-01-572-3869
NSN 5985-00-166-3179
NSN 5985-00-186-2927
NSN 6240-00-450-8889
NSN 5835-01-359-2575
NSN 5910-01-120-7744
NSN 7035-00-763-6180