Aeronautical Standard - Machine Bolt - AN3-71A
Standard Part
Description: Machine Bolt
Part Number: AN3-71A
Alternate Part Numbers: No known alternate
Product Overview:
An externally threaded fastener designed for insertion through holes in assembled parts and normally intended to be tightened or released by torquing a nut. the threaded and unthreaded portions are both of one diameter of 0.190 inch (5 mm) or larger. The head is not designed to be held or driven with an inserted driver or by the thumb and fingers. a locking feature may be incorporated in the design of the head or threads. head dimensions and sizes of threaded and unthreaded portions shall conform to internationally recognized fastener standards. for items having a grip length portion machined to a tolerance of 0.0015 inch (0.038 mm) or less, bolt, shear. See also screw, cap, hexagon head and screw, machine.
Item Specification:
| Thread Class | 3A | |
| Thread Direction | Right-hand | |
| Thread Length | 0.406 inches minimum | |
| Fastener Length | 7.140 inches minimum and 7.187 inches maximum | |
| Head Style | Hexagon | |
| Head Height | 0.109 inches minimum and 0.141 inches maximum | |
| Width Between Flats | 0.365 inches minimum and 0.377 inches maximum | |
| Nominal Thread Diameter | 0.190 inches | |
| Grip Length | 6.734 inches minimum and 6.766 inches maximum | |
| Features Provided | Finished head | |
| Thread Quantity per Inch | 32 | |
| Minimum Tensile Strength | 125000 pounds per square inch | |
| Hardness Rating | 26.0 rockwell C minimum overall and 32.0 rockwell C maximum overall | |
| Material | Steel overall | |
| Surface Treatment | Cadmium overall | |
| Thread Series Designator | UNF |
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