Bolt tightening torque table

Proofload is the published number that full size headed bolts are tested to. The bolt is stressed up to the proofload value, and if there is no deformation, elongation, or fracture, then the bolt is deemed to have passed. For bolting specifications that do not have a published proofloa it is usually calculated at of minimum yield strength.

Torque table provides the required value for bolt tightening. A complete torque tightening procedure.

Flange joints require proper tightening to avoid the leak of the fluid from the joint. Metric bolt torque chart lists the typical maximum recommendations for tightening torques for metric bolts. Information regarding socket head bolt torque chart and metric socket head bolt torque chart can easily be got online, from websites that deal with these kinds of products. Hexagon nut style) tan β = 0. Torque Why do we tighten screws？ T The purpose of tightening screws is to fix one object to another object. We call this force to fix axial tension.

Apply suitable axial tension It is best to do axial tension control for tightening screw, but ac-tually it is difficult to measure.

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. Torque is only an indirect indication of tension. What does torque mean when tightening bolts? How do you tighten a bolt?

What ft lbs of torque should the head bolts be tightened to? However, only about of the torque applied is transferred into clamping force. Tightening torque to preload a bolt Metric thread : MM1. The final tightening sequence is achieved smoothly and slowly.

Clamp loads for Grade C lock nuts equal of the bolt proof loads specified for SAE J-4Grade and ASTM A-3Grade BD bolts. 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.

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.

At fourth stage again use percentage of the final torque value. For heat exchangers flanges torque values to be 371and 1percent of the final torque value. Where recommended to use hydraulic tensioner for bolt tightening follow the manufacturer recommendations. A table is provided below to show an example of torques applied for bolt. Torque specifications are shown either as an exact figure, or a specific range.

Follow any special instructions or multi-step directions carefully to assure correct final torque. There may be different specifications for different size bolts , bolts in different positions, tightening bolts in several stages, or a cold engine vs. Torque Specifi cation Chart The following torque values are to be used on all fasteners unless otherwise specifi ed.

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. SAE and Metric Fastener Torque Specifications Rev A. TORQUE CHART - SAE PLAIN AND ZINC PLATED. BLACK OXIDE BOLTS , SHC.

Tighten and loosen multiple bolt s simultaneously.