Torque Values For Sheet Metal Screws

Self tapping screw pull out and torque equations.

Torque values for sheet metal screws.

Ansi mechanical hardware bolt screw torque and force design. In particular i am concerned with metrical dimensions m8 m10 and m12. Sae grade 6 133 000 psi med. Recommended torque values for socket head screws flat head screws set screws button head screws shoulder screws stainless steel and non metal fasteners like brass aluminium and bronze buy now.

Sae 0 1 2 74 000 psi low carbon steel. As in the title i need some indication about the optimal tightening torque to choose when screwing in a ss screw a2 70 say into an aluminium threaded hole. Fastener black book hot sheet f9. Torque values for stainless steel and non ferrous fasteners bolt silicon monel brass 2024 t4 size dry lubricated dry lubricated bronze aluminum 2 56 2 5 in lbs 2 1 in lbs 2 6 in lbs 2 2 in lbs 2 3 in lbs 2 5 in lbs 2 0 in lbs 1 4 in lbs 2 64 3 2 6 3 2 2 7 2 8 3 1 2 5 1 7 4 40 5 2 4 4 5 5 4 7 4 8 5 3 4 3 2 9 4 48 6 6 5 6 6 9 5 9 6 1 6 7 5 4 3 6.

Sheet metal screws sheet metal screws are one type of self tapping screw. Common screw bolt heads common workshop nuts. A short screw clamping plain metal components reaches the rated torque in only a fraction of a turn of the screw. Mended torque of the screw dimension and quality in ques tion measured from the snug level the point at which the components and the screw head become tight.

Coarse fine coarse fine coarse fine coarse fine coarse fine coarse fine 4 5 2 4 8 4 3. The minimum torsional loads shown for unified sizes are based on bs 1580 an imperial units standard. Sae grade 5 120 000 psi med. Value fastener stocks type a type ab high low and type b sheet metal screws.

Grade 2 grade 5 grade 8 18 8 s s bronze brass. In astm a574 clamp load lbs tightening torque k 0 15 k 0 17 k 0 20 coarse thread series 1 0 0730 64 0 0026 275 3 0 in lbs 3 4 in lbs 4 0 in lbs 2 0 0860 56 0 0037 388 5 0 5 7 6 7. Due to the fact that fastening applications differ greatly the above information is for guidance only and is correct to the best of our knowledge. M10 over ft lbs metric fasteners nominal size or basic screw dia.

To see the equation behind his calculator visit. Fastener black book hot sheet f10. Threads per inch tensile stress area sq. Sae grade 7 133 000 psi med.

The torque rate can vary considerably for the same diameter of screw. This calculator tool will determine the pull out force and stripping torque for self tapping screws.