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Metric Bolt Torque Chart. 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.
Use Prevailing Torque All-Metal Nut chart if using this style of nut. = Nominal Diameter. = Clamp Load For J429 Grade 5 and 8, FNL Grade 9, A574, Class 4.6, 8.8, 10.9 and 12.9, the clamp loads are listed at 75% of the proof loads specified by the standard. For A307 Grade A, 75% of 36,000 PSI is utilized.
K values: waxed (e.g. pressure wax as supplied on high strength nuts) = .10, hot dip galvanized = .25, and plain non-plated bolts (as received) = .20. Torque has been converted into ft/lbs by dividing the result of the formula by 12
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 85% of the proof load.
Torque-Tension Relationship for Metric Fasteners. The torque values can only be achieved if nut (or tapped hole) has a proof load greater than or equal to the bolt's minimum ultimate tensile strength. Clamp loads estimated as 75% of proof load for specified bolts. Torque values listed in foot-pounds .
24 lip 2024 · Determine bolt size — find the diameter and thread pitch of the bolt. Look up torque specification — use a torque chart specific to the bolt's size and material. Consider material strength — adjust for the bolt and mating material's strength. Apply a torque wrench — set the wrench to the specified torque value.
The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. K -constant. d - diameter of bolt (m, ft) F - axial bolt force or load (N, lbf) torque reduction due to lubrication (%)
