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Old 02-01-2018, 08:56 PM   #1
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self tapping screws


I have seen on You-Tube self tapping screws penetrating and tapping holes in thick steel. It appears much thicker that my 7 ga. steel. I have purchased two different brands of self tapping screws at the "big box" stores. Both drill the hole and started to tap its way thru the plate but broke off beneath the screw head. This happened 4 times regardless of how careful I was with speed and pressure. I was using #8 x 1/2" and #8 x 3/4".
Where can I buy a good hardened screw that will perform as I need? I don't think that a case hardened screw will work?? I read that case hardened means that only the outside of the screw is hardened
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Old 02-01-2018, 09:45 PM   #2
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Re: self tapping screws


Do you have a Grainger supply nearby?

or try a place that specializes in nuts bolts, and screws.


ED
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Old 02-01-2018, 09:49 PM   #3
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Re: self tapping screws


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Originally Posted by captfl2x View Post
I have seen on You-Tube self tapping screws penetrating and tapping holes in thick steel. It appears much thicker that my 7 ga. steel. I have purchased two different brands of self tapping screws at the "big box" stores. Both drill the hole and started to tap its way thru the plate but broke off beneath the screw head. This happened 4 times regardless of how careful I was with speed and pressure. I was using #8 x 1/2" and #8 x 3/4".
Where can I buy a good hardened screw that will perform as I need? I don't think that a case hardened screw will work?? I read that case hardened means that only the outside of the screw is hardened
What ever you are screwing together can not have a gap between when you tighten the screw. You are trying to pull them together and it will break the screw or just stop every time.
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Old 02-01-2018, 10:03 PM   #4
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Re: self tapping screws


Self tapping or self drilling

http://www.allpointsfasteners.com/FAQ.html
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Old 02-02-2018, 08:57 AM   #5
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Re: self tapping screws


Likely the screws you find at big box stores are sheet metal screws. They don't tap anything, they bend the sheet metal to the helix of a thread.

Search for TEKS 5 screws. Probably have to go to a place like Fastenal to find them, or online. Not sure if you will be able to buy two or three --- might have to buy a box, and I doubt they are cheap. Never used them myself, but they are supposed to be good for thicker steel plate.
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Old 02-02-2018, 11:49 AM   #6
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Re: self tapping screws


The last two screws that broke were TEK from the "big box store"; however, I do not know that those were "TEK 5". I assume TEK 5 means a "5" point. I'll also check out Grainger. I sent a message to http://www.allpointsfasteners.com/FAQ.html.

Thanks for the help.
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Old 02-02-2018, 01:32 PM   #7
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Re: self tapping screws


I'm not sure they are designed for two layers of 7G. That is some pretty heavy metal. I would just drill the holes and be done with it.

If you can convert 1000s to gauge this page might help you: https://www.hilti.com/medias/sys_mas...OC_1577675.pdf
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Old 02-02-2018, 04:02 PM   #8
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Re: self tapping screws


I only have one 7 ga. steel to go through. I am attaching a wire underneath the screw head to the plate.
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Old 02-03-2018, 09:34 AM   #9
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Re: self tapping screws


Quote:
I was using #8 x 1/2" and #8 x 3/4".
Ayuh,..... Step up to #10s, #12s, or even #14s,....
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Old 02-03-2018, 10:16 AM   #10
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Re: self tapping screws


Thanks to all for your suggestions/tips.
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Old 02-05-2018, 05:52 PM   #11
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Re: self tapping screws


I solved my screw breaking problem although it involves extra work. I first drill with a bit slightly under the diameter of the screw cutting tip. I coat the screw tip and threads with tap cutting oil before using an impact driver. I stop the driver before the head bottoms out and I use a small ratchet to finish the job.
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