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 5999-00-883-8862
NSN 5950-00-801-8293
NSN 6645-01-155-6568
NSN 6105-01-044-2559
NSN 6110-01-188-8017
NSN 5985-00-564-4102
NSN 5950-01-426-8810
NSN 5998-01-335-4294
NSN 6150-01-012-3971
NSN 6220-01-582-4382
NSN 5965-00-275-0491
NSN 5950-00-845-3733