Screw Pull Out Force
Screw Pull Out Force
(OP)
Need pull out force for a #6 x 2" coarse thread drywall screw embedded 1-5/8" into yellow pine.
Thanks,
TD
Thanks,
TD
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RE: Screw Pull Out Force
Check with manufacturer....they MIGHT have data that specific, but usually more general.
RE: Screw Pull Out Force
Have emailed Hilti and Grip Rite.
Hope to have reply next week.
I remember reading a text that had general info on screw pull out strength, but can not remember the text.
May have to just test several screws with a pull out gage if I can not get any answers.
Thanks,
TD
RE: Screw Pull Out Force
Your best information will come from a series of tests.
You could reference the 2005 NDS, Section 11 for more information - you will need to know the specific gravity of the wood. For a #6 wood screw, the values vary from 38 to 209 pounds per inch of penetration into the side grain, multiplied by the appropriate adjustment factors in Table 10.3.1. Your final calculated values from the NDS will likely be substantially less than your test results. But then, your test results will also vary dramatically depending upon the nature of the grain that the screws are driven into.
None of the above considers the tensile strength of the screw itself.
Ralph
Structures Consulting
Northeast USA
RE: Screw Pull Out Force
Hilti and Grip Rite will likely tell you the strengths of their fasteners alone - the final value will depend on the wood.
Ralph
Structures Consulting
Northeast USA
RE: Screw Pull Out Force
RE: Screw Pull Out Force
As for testing, you will need to verify that the wood you are testing in meets the actual sg for that species as 95% of that species should be higher than the species sg. This is because of the 5% rule for determining the lumber values under the grading rules.
Garth Dreger PE
AZ Phoenix area
RE: Screw Pull Out Force
RE: Screw Pull Out Force
I thought this was only applicable to dogs.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Screw Pull Out Force
Mike,
You are BAD!
(Had to think about for a bit)
Ralph
Structures Consulting
Northeast USA
RE: Screw Pull Out Force
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Screw Pull Out Force
Is that called a stuck stiffie? What a bitch.