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screw, cap, socket head; steel; 0.312-4, UNRF-3A rh thd, 0.560 in. nom screw thd lg, 2.560 in. nom fastener lg, C38 min, C45 max o/a rockwell hardness; 190000 psi min tensile, 170000 psi min yield strength; 0.457 in. min, 0.468 in. max hd dia, 0.306 in. min, 0.312 in. max hd h, 30 deg nom champfer angle; 0.250 in. nom w across flats
1EA
FSC 5305 ⁓ Screws
screw, cap, socket head; steel; 0.312-4, unrf-3a rh thd, 0.560 in. nom screw thd lg, 2.560 in. nom fastener lg, C38 min, C45 max o/a rockwell hardness; 190000 psi min tensile, 170000 psi min yield strength; 0.457 in. min, 0.468 in. max hd dia, 0.306 in. min, 0.312 in. max hd h, 30 deg nom champfer angle; 0.250 in. nom w across flats
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An externally threaded fastener whose threaded portion is of one nominal diameter. the head has an internal socket or multiple spline for use with an inserted driver. a locking feature may be incorporated in the design of the head or threads. excludes items with bevel (conical) heads. see bolt, internal wrenching. excludes screw, shoulder; and screw, machine.