Bolt torque table

US Recommended Bolt Torque. This is done to allow a safety buffer so that the bolt does not get too close to the proofload value. If you exceed the proofload value when tensioning the bolt , you run the risk of bolt failure.

Clampload is only a estimated number, there maybe situations where the engineer calls for the bolts to be tensioned to a different value. To many people, torque is a word that is not at all easy to comprehend. But in the simplest terms, torque is known as the tendency of a force to twist or turn.

Or in other words, it is the measure of a force which causes an object to rotate about an axis. A complete torque tightening procedure. Flange joints require proper tightening to avoid the leak of the fluid from the joint. For these reasons, it is not practical to provide a single bolt torque chart or formula that is accurate for all situations.

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. Lubricated refers to fasteners in the “As Received” condition, which is normally a light preservative oil coating on unplated fasteners and no oil coating on plated fasteners. IFI-1does not govern lock nuts above 1.

The values shown in the chart are to be used as a mid-range guideline. All other torque values are in. Clamp load calculated as of the proof load when specified by the standard. ASTM A3utilized of 30PSI. Reduce value by if threads.

Wide range of standard and custom hydraulic bolt tensioning tools. Achieves even preload on large bolt s. Torque values are based on clean, dry threads. FLANGE BOLT CHART : The chart shows the number, the diameter and the length of stud bolts for ASME flanges (by flange NPS and pressure rating, or class).

Because the calculations specified in the torque chart below are offered as a guide only, it is the sole responsibility of any person using them to assume all risk. There are many variables affecting the torque -tension relationship, such as human error, surface texture, and lubrication. The torque tables are built on specific assumptions regarding bolt and nut factor.

Before using a given torque table , these assumptions should be verified to insure they are appropriate for the specific application. Even if all assumptions are appropriate, may vary depending on actual conditions. RECOMMENDED ASSEMBLY TORQUES Class 10. To convert kN to lbf: Multiply kN by 224.

There is no torque difference for fine or coarse threads.

DO NOT use these values if a different torque value or tightening procedure is given for specific application. Check tightness of fasteners periodically. Shear bolts are designed to fail under predetermined loads.

Always replace shear bolts with identical property class.