Per asme b46.1. "d" diameter underside of head, root of threads and thread flanks 32 microinches ra. All other surfaces, 125 microinches ra.
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: Bolts and bolts and their nuts or washers exported in the same shipment
NSN 6645-01-534-3148
NSN 5990-01-200-7460
NSN 6135-01-485-3450
NSN 5999-01-422-9768
NSN 5945-01-306-6205
NSN 5915-01-534-7614
NSN 5996-00-998-1519
NSN 5925-00-687-1625
NSN 5895-00-468-4103
NSN 5895-00-401-9659
NSN 6220-00-652-3829
NSN 5960-01-446-4446