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Re: turn of the nut

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Have not used the software but I'll give a look

The whole bolt / screw tightening has give me trouble throughout my career; dry / lubed, K factor,bolt / nut material & finish, etc  such a large range.  Is it tight enough? Have I over stressed the fastener? (esp a problem with small mechanical fasteners)

I actually did some torque testing of bolt / nut sets using hollow load cells to convince myself that I WAS getting decent tension & not over stress the bolts. But it's still a pretty crude practice.

I got really spoiled when I got to tension Dywidags directly,  cuz  there's no tensioning  them by "turn of the nut"  :)


On 6/14/07, Michel Blangy <mblangy(--nospam--at)> wrote:
Has anyone used any of the software available from Boltscience? I have been playing with a few of the demos this morning. I am quite impressed and am interested in the opinions of any other users. The demos are downloadable directly from the website:

Michel Blangy, P.E.

-----Original Message-----
From: Robert Kazanjy [mailto:rkazanjy(--nospam--at)]
Sent: Wednesday, June 13, 2007 4:59 PM
To: seaint(--nospam--at)
Subject: Re: turn of the nut


Here's a link to a pretty good treatment of bolt tightening


On 6/13/07, raincat1(--nospam--at) < raincat1(--nospam--at)> wrote:
Say I have a tapped hole, and I need full pre-tension on the bolt. How do I apply the "turn of the nut" method? How do I test representative samples as required by AISC? In this connection - I don't have a nut!

Thanks !!

Rainier C. Catubig
San Diego, California

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