A high strength, 160,000 pounds per square inch (1100 megapascals) minimum tensile strength externally threaded fastener designed for use in applications involving great shear stress. The head is designed to accommodate an external wrench or driver. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. The unthreaded portion is of specific grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (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. A locking feature may be incorporated in the design of the head or threads. See bolt, machine and bolt, clevis.
Dept. of the Air Force 
Australia 
New Zealand Classification: Zirconium and articles thereof nesoi
NSN 7035-00-497-8784
NSN 2925-00-233-5644
NSN 6135-01-359-5798
NSN 6610-01-136-7836
NSN 6110-00-956-7472
NSN 2925-00-927-1862
NSN 6685-01-324-4710
NSN 2925-01-394-5650
NSN 5925-01-392-6382
NSN 4140-01-197-0406
NSN 5915-01-195-6083
NSN 5905-01-162-3954