In the following table of torque specifications, you will find all the necessary torque values in Newton-meters (Nm) for common screw thread sizes and strength classes. Please note that the required torque may vary due to differences in screw strength classes and thread sizes.

Metric screw torque specifications for a large variety of fasteners. Details for Socket screw head size, Hex key or wrench drive size, hardness and tensile strengths for screws including Button Head, Socket Head Cap, Low Head Socket, Set Screws and Flat Head socket screws.

SizeUNRC Torque (N•m) Inch Metric Size Nominal Tightening Torque Nominal Tightening Torque Size (In-Pounds) Size (N•m) 4 5 6 8 10 1/4 516 3/8 1/2 5/8 Inch-Button Head Metric-Button Head 8-15 30 65 125 200 360 1000 1750 M3 x 0.5 M4 x 0.7 …

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.

Torque values are based on VDI 2230, edition 2015: The table lists maximum permissible tightening torques and the resulting maximum preload for hex cap screws and socket cap screws. Torque / preload values are applicable for other types of externally threaded fasteners also, as long as head strength and bearing areas are equivalent.

helpful information regarding Typical Dimensional and Torque Specifications of TORX Tools

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

Torsional and tensile data for non-ferrous fasteners.

Preloads and tightening torque for Metric ISO countersunk head steel screws with hexagon socket head or similar heads. Typical values for countersunk heads screws with hexagon/hexalobular socket or associated nut, friction coefficient µ = 0.14, Fine thread and course threads apply