Pullout rating of #10 screws 2

[techlist]

Hi guys:

I need to find some data on typical pullout strength values for #10 screws into wood (SYP). I'm makign a device that has to be hung from a ceilign and need to document/confirm the screw selection.

Thanks,
Scott

 

[CJJS]

163 lb/inch of thread penetration into side grain of main member. Thread length is approx. 2/3 of the total wood screw length. That is for No.1 SYP. This value should be multiplied by all applicable adjustment factors (i.e., Load duration factor, Wet service factor, temperature factor, end grain factor).

 

[boo1]

Check site

http://www.fpl.fs.fed.us/documnts/fplgtr/fplgtr113/ch07.pdf

 

[techlist]

Thanks guys, much appreciated. This is for mouting a device to a residential ceiling. Other than side grain, I won't know much else about the conditions. The load is continous, permanent (load hanging). I presume it won't get wet, Temperature will vary, could be joists in an attic or a basement. Given those, do you know the conservative adjustment factors? Reasonable factors to apply to a typical residential ceiling structure?

 

[CJJS]

I'd use load duration factor of 0.9.