Boeing t.O.52-11-01-36
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 Army 
Dept. of the Navy 
Australia 
New Zealand 
Republic of Korea NSN 5996-01-026-4750
NSN 6145-01-362-6875
NSN 6240-01-062-1684
NSN 7035-01-517-8663
NSN 5930-01-368-7348
NSN 6620-00-296-6762
NSN 6130-00-071-1518
NSN 5855-01-246-4274
NSN 6685-01-392-0602
NSN 6145-00-225-9552
NSN 5930-01-218-5151
NSN 5905-01-320-5726