The corresponding values for the various screw sizes and strength classes for metric coarse threads can be found in the metric torque table below. The following table shows the tightening torque for metric thread fasteners. In the List metric bolt torque chart you find the metric torque unit in Nm and ft lbs.

Maximum recommended tightening torque for coarse threaded metric steel bolts: Max. Tightening Torque (Nm) Bolts, nuts and threaded rods - torque, tension and loads. Calculate required bolt torque. Improvise a torque wrench with a luggage scale. Dimensions of metric threads according ISO 724. Lubrication effect on bolt tension and torque.

the torque value to be set for a paticular size of screw is dependent upon: 1) material of the screw 2) parent material (steel, non - ferrous metal or plastic) 3) whether the screw is untreated or plated 4) whether the screw is dry or lubricated 5) the depth of the thread tables below are given for informational use only.

The following suggested tightening torques provide an excellent starting point for determining torque requirements. Remember, you may need to vary these numbers somewhat based on the individual joint or the amount of fastener lubrication. This table is offered as the suggested maximum torque values for threaded products and is only a guide.

Torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly equipment failure or personal injury.

The following table shows the tightening torque for metric fine thread fasteners. In the List you find the metric fine torque unit in Nm and ft lbs. You can also made an conversion from the unit Nm to ft lbs and also from ft lbs to Nm.

Maximum pre-load (N) property class to ISO898/1 Maximum tightening Torque (Nm) property class to ISO898/1; Thread Coeff of friction 3.6 4.6 5.6 4.8 5.8

Let’s take a look at the correct torque values for common bolts, including M6, M8, M10 and M16. Torque for M6 bolts. An M6 bolt is commonly used for smaller, less critical applications. When using a standard steel M6 bolt, the typical torque value is approximately 9.6 Nm (Newton-metres).

Torsional and tensile data for non-ferrous fasteners.

Maximum Tightening Torques for Coarse Threaded Metric Bolts. Property classes (grades) are defined by ISO 898 (Mechanical properties of fasteners made of carbon steel and alloy steel). This table shows values for threads that have been lightly oiled and the tension is …