Nominal Size | D | A | H | J | T | F | Tensile Strength Pounds Min. | Tightening Torque Inch Pounds | ||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic Screw Diameter | Head Diameter | Head Height | Hex Socket Size | Key Engagement | Fillet | |||||||
Max | Min | Max | Min | Min | Max | Min | UNRC | UNRF | ||||
8 | 0.1640 | .270 | .265 | .082 | .079 | .0781 | .060 | .012 | .007 | 2,310 | 2,440 | 19.4 |
10 | 0.1900 | .312 | .307 | .095 | .092 | .0938 | .072 | .014 | .009 | 2,890 | 3,300 | 33.5 |
1/4 | 0.2500 | .375 | .369 | .125 | .121 | .1250 | .094 | .014 | .009 | 5,250 | 6,000 | 77.9 |
5/16 | 0.3125 | .437 | .431 | .156 | .152 | .1562 | .120 | .017 | .012 | 8,650 | 9,550 | 156.0 |
3/8 | 0.3750 | .562 | .556 | .187 | .182 | .1875 | .145 | .020 | .015 | 12,800 | 14,450 | 273.0 |
1/2 | 0.5000 | .750 | .743 | .250 | .244 | .2500 | .184 | .026 | .020 | 23,400 | 26,350 | 615.0 |