Bolt tightening torque constant

2015-11-26

Material of the gasket, the standard parts used in the SS41, the carbon steel quenching and tempering, or small carbon steel by quenching and tempering. Its hardness has never been more than the use of bolts, nuts, but also hard. JIS B1186 stated before, although the use of these two kinds of materials, but when using 110kg bolts and tighten force increases, the aluminized carbon washers internal soft and produce small lacunae, bring adverse effects to the tightening torque. Therefore, from the point of view of unified specifications, B1186 JIS only provides for the quenching and tempering of the washers. In A490 is also provided for quenching, tempering the washer.

F13T bolt of the gasket is HRC45 ~ 55. But some people think that it is not necessary to have such a large hardness, can be used with the F11T and the following HRC40 ~ 50 to unify, but these need to be tightened and the effect after the investigation to carry out the investigation.

In order to make the bolt tightening the torque is fixed, and the torque value is reduced, the surface of the gasket must be smooth. To this end, the surface of the gasket is sometimes needed to be processed.

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