Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Screw Factor of Safety?

[Subject Prev][Subject Next][Thread Prev][Thread Next]

On Aug 30, 2004, at 4:37 PM, Jim Wilson wrote:

Most catalog fasteners (i.e. self-drilling screws, epansion anchors, etc.) have a factor of safety of 4(or higher) for design.  Is there a different factor of safety when considered during field testing?
I wouldn't dream of making a generalization like this. If someone is asking you to substitute something on this basis, he'd have to prove to me, or pay me to prove it for him, that the substitute item is suitable for the design loading, with the customary margin (eg a margin of two against ultimate strength for a bolt for like items under the specified service. When a guy with an ax to grind waltzes into my life announcing that something has a safety factor of du-wah, he better be ready to show me the numbers.


Christopher Wright P.E.   |"They couldn't hit an elephant at
chrisw(--nospam--at)skypoint.com      | this distance" (last words of Gen.
.............................................| John Sedgwick, Spotsylvania 1864)
http://www.skypoint.com/~chrisw


******* ****** ******* ******** ******* ******* ******* ***
*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
* * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
* Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org ******* ****** ****** ****** ******* ****** ****** ********