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[chrisdb]

Does anyone know why some bolts are tightened by angle as opposed to torque, but also, why do they say for example, 30 then 30 rather than just 60?

It is not important but just curious.

[Kevin Wood]

Angle tightening is more accurate when you have bolts designed to stretch. The idea is that you have a low torque setting that establishes a starting point where everything is clamped together. As you angle tighten the bolt is stretching. Since the torque required to achieve a given amount of stretch is variable, depending on lubrication of the threads, etc, and angle is specified instead. If you turn a bolt through a given angle it will always wind itself into the hole by the same amount.

Kevin

[Bandit127]

Angle tightening is more accurate when you have bolts designed to stretch. The idea is that you have a low torque setting that establishes a starting point where everything is clamped together. As you angle tighten the bolt is stretching. Since the torque required to achieve a given amount of stretch is variable, depending on lubrication of the threads, etc, and angle is specified instead. If you turn a bolt through a given angle it will always wind itself into the hole by the same amount.

Kevin

That was a quality reply, my knowledge is enriched! Thanks Kevin.

Jim

[chrisdb]

Yes, thanks Kevin. I'm quite technical as that really explained it well.