We use cookies to deliver the best possible user experience and to collect anonymous statistical data about our web traffic. Fine pitch bolts also have different torque levels generally specified in the manufacturer’s documentation.

Therefore for countersunk bolts the calculated tension resistance F t,Rd should be reduced by a factor of 0.If you properly torque the bolts, they will provide the maximum amount of clamping force under load.

They have a proof load of 970 MPa, minimum yield strength of 1100 MPa, and a minimum tensile strength of 1220 MPa. We hope these metric bolt torque charts have helped you discover the correct tightening torque for the bolts you use. Zinc Flake coated high tensile steel class 12 - a higher tensile non-stainless grade for screws and bolts. for long joints where the distance between the centers of the end fasteners measured in the direction of load transfer is more than 15 d the design shear resistance F v,Rd of all the fasteners should be multiplied by the reduction factor β Lf specified in EN1993-1-8 equation 3.Compare the bolts you have with the diagrams below, then refer to the appropriate chart to see the ideal tightening torque. Minimum and maximum spacing p 1, p 2 and edge distances e 1, e 2 for bolts are given in EN1993-1-8 Table 3. For preloaded bolted connections which are slip-resistant at the Serviceability Limit State or the Ultimate Limit State the corresponding shear load F v,Ed should not exceed the design slip resistance as specified in EN1993-1-8 §3.

where e 2 is the distance between the center of the edge bolt and the end of the plate measured perpendicular to the load transfer direction, p 2 is the distance between the centers of neighboring bolts measured perpendicular to the load transfer direction, and d 0 is the diameter of the bolt hole. The design resistance of a group of fasteners may be taken as the sum of the design bearing resistances F b,Rd of the individual fasteners provided that the shear resistance F v,Rd of each individual fastener is greater than or equal to the design bearing resistance F b,Rd. where bolts transmitting load in shear and bearing pass through packing plates of total thickness t p greater than d / 3 the design shear resistance F v,Rd should be multiplied by the reduction factor β p specified in EN1993-1-8 equation 3. Want to determine what size clearance hole for Imperial, for example, 3/8″, then check out our chart here. The punching resistance of the bolt B p,Rd should be verified against the applied tensile load F t,Ed in accordance with EN1993-1-8 Table 3.In addition for countersunk bolts the bearing resistance F b,Rd should be based on a plate thickness t equal to the depth of the connected plate minus half the depth of the countersinking. M14 bzp hexagon head bolts are manufactured from steel and have a diameter of 14 mm, conform to DIN 931 spec, and have a partial thread. Refer to the charts below, which show the ideal tightening torque for each bolt grade for a variety of sizes.