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.
Dept. of the Air Force 
Dept. of the Navy 
Finland 
Spain 
Singapore 
Malaysia 
Australia 
Canada 
Republic of Korea 
Italy Classification: Bolts and bolts and their nuts or washers exported in the same shipment
NSN 7035-01-098-4168
NSN 6135-01-281-4758
NSN 6145-01-171-4011
NSN 2925-01-400-2286
NSN 6110-01-574-8154
NSN 6645-01-381-7104
NSN 5945-00-853-2063
NSN 6320-01-422-1212
NSN 5855-01-003-7102
NSN 5835-01-522-1023
NSN 5965-01-362-9609
NSN 6145-01-591-6095