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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.
Title: Metric Bolts, Screws & Nuts: Tightening Torques Author: Fastener Mart Created Date: 8/12/2006 10:22:23 PM
U.S. Recommended Bolt Torque Table. * Sizes from 4 to 10 are in in.-lbs. Sizes from 1/4 up are in ft.-lbs. ** Fine thread figures are for 1-14. Grade 2, 5, and 8 values are for plated bolts.
Torque specifications, especially for critical joints, should be determined under actual assembly conditions due to the many variables involved which are difficult to predict and do affect the torque-tension relationship.
• Use specified bolts and nuts, tightening them to the torques specified in this section unless otherwise stated. • Threaded portions and bearing surfaces should be dry. • Where the property class differs between the nut and bolt (or stud bolt), use the tightening torque specified in the
This booklet provides an introduction to the technique of us-ing threaded fasteners for assembling components, the ap-plication of power tools for the assembly and the influence of tool selection on the quality of the joint. 1.
Tension lbs Tightening Torque (ft lbs) Bolt Size TPI Proof Load Clamp Load Waxed Galv Plain 1⁄4 20 3,350 2,513 5 13 10 5⁄16 18 5,500 4,125 11 27 21 3⁄8 16 8,150 6,113 19 48 38 7⁄16 14 11,150 8,363 30 76 61 1⁄2 13 14,900 11,175 47 116 93 9⁄16 12 19,100 14,325 67 168 134
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 load calculated as 75% of the proof load when specified by the standard. ASTM A307 utilized 75% of 36,000 PSI.
These torque levels are guideline values for metric standard threads in accordance with DIN ISO 261 and head sizes in accordance with DIN EN ISO 4762, DIN EN ISO 4032, DIN EN ISO 4014, and DIN 931-2, 6912, 7984 und 7990. These produce a 90 % utilisation of the bolt yield strength. The
Torque is only an indirect indication of tension. Under/over tightening of fasteners can result in costly equipment failure or personal injury. NOTES: 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 tensile strength.