BOLT - AN4-12A
Aeronautical Standard Part
1/4-28, UNF, 3A, Right Hand, 0.468 in L Thread
Description: BOLT - Undrilled Shank
Part number: AN4-12A
Alternate part number: Beech substitute - 130909B41
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 nominal 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.
Product Features and Specification:
| Thread Direction | : | Right-hand |
| Thread Diameter | : | 0.250 inches |
| Thread Class | : | 3a |
| Surface Treatment Specification | : | Class 3 federal specification all treatment responses type 2 qq-p-416 |
| Surface Treatment | : | Cadmium and chromate |
| Min. Tensile Strength (psi) | : | 125000 pounds per square inch |
| Material Specification | : | Mil-b-6812 military specification all material responses |
| Material | : | Steel |
| Head Style | : | Hexagon |
| Head Height | : | Between 0.140 inches and 0.172 inches |
| Hardness Rating | : | 26.0 rockwell c and 32.0 rockwell c |
| Grip Length | : | 0.812 inches |
| Features Provided | : | Finished head |
| Fastener Length | : | 1.281 inches |
| Thread Length | : | 0.469 inches |
| Thread Qty Per Inch (tpi) | : | 28 |
| Thread Series Designator | : | Unf (fine thread) |
| Width Between Flats | : | Between 0.428 inches and 0.440 inches |
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