looking for data test results on screw pullout force
looking for data test results on screw pullout force
(OP)
Good Morning,
I'm looking for test data pertaining to the pull out force or holding strength of 12-24 thread forming screws in thin metal, 18 and 16 gauge steel.
The screws are 410 stainless steel and 1/2" long and have a trilobular lead.
We will perform pull tests but was curious if anything has been documented.
Leads to exsiting standards, such as AISI, but I've had trouble gaining access to their site.
Thanks in advance for your assitance.
Regards,
hinged
I'm looking for test data pertaining to the pull out force or holding strength of 12-24 thread forming screws in thin metal, 18 and 16 gauge steel.
The screws are 410 stainless steel and 1/2" long and have a trilobular lead.
We will perform pull tests but was curious if anything has been documented.
Leads to exsiting standards, such as AISI, but I've had trouble gaining access to their site.
Thanks in advance for your assitance.
Regards,
hinged





RE: looking for data test results on screw pullout force
Industrial Fasteners Institute lists ANSI/ASME B18.6.4, "Thread Forming and Thread Cutting Tapping Screws and Metallic Drive Screws(Inch Series)".
I do not see any listing for the trilobe in this standard but you might try the ITW site on these.
Griffy
RE: looking for data test results on screw pullout force
I am surprised the you are using a triround, machine screw thread into that thickness of material. Because of the low thread height and the out of roundness, you will not get the best results unless you use a very small hole size. I think a better selection would be some type of high performance sheet metal screw (Cyclone, Crimptite).
Also, just one further comment; the 410 SS isn't going to give you much in the line of corrosion resistance, you might want to switch to something like Dacromet on a carbon steel part.
RE: looking for data test results on screw pullout force