Re: Coarse vs Fine Thread ?

Posted by Steve Crum on July 04, 2005 at 05:18:06 from (4.156.228.118):

In Reply to: Re: Coarse vs Fine Thread ? posted by Davis In SC on July 03, 2005 at 19:52:55:

In practice I'm told, a fine thread is no stronger than a course thread. The machinist that I have do the precision tool and die work for the shop explained this to me. The primary advantage fine threads have over course threads is their capability of acheiveing and maintaining a true torque value within a tolerable plus or minus percentage.
ie; if a course thread bolt at 100 ft.lbs backs off 10 degrees you could conceiveably lose 10% of the torque value and the bolt would be at 90 ft.lbs torque.
If a fine thread bolt were to back off the same 10 degrees you may only lose 2 ft.lbs. torque so the bolt would still be at a more acceptable 98 ft.lbs. torque.
The fine thread gives you more capability to fine tune the torque to exact values making the net parameter closer to the true torque value.
I'm sure you engineering types have a more precise and easier way of explaining this, this is just how it was explained to me so I could understand it.

Follow Ups:

• Re: Coarse vs Fine Thread ? Joe(TX) 09:30:36 07/05/05 (0)

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