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profdant139's avatar
profdant139
Explorer II
Jan 25, 2019

Questions: self drilling/ tapping screws for chassis work

I'm getting ready to install my underbelly cover -- there will be aluminum C channel beams (to support the foam panels and the coroplast under-skin) attached to the underside of the trailer's frame me...
jkwilson's avatar
jkwilson
Explorer III
Jan 26, 2019
ken56 wrote:
Go to Fastenal and get some GOOD tapping screws, Cheap ones will cause you more grief than you can imagine. I have run good tapping screws into 1/4" steel with no pilot hole. It is not recommended. Use a backing washer also.


Difference between self tapping and self drilling.

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