2.490 inches minimum and 2.510 inches maximum grip length, 32 thread quantity per inch, 160000 pounds per square inch minimum tensile strength, 36.0 rockwell c minimum and 40.0 rockwell c maximum overall hardness rating, 99.0 degrees minimum and 101.0 degrees maximum countersink angle, 2.649 inches minimum and 2.669 inches maximum first hole distance from head largest bearing surface to shank hole center

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.