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I need to know how self drilling and self tapping screws are really manufactured. The heads on a batch of screws I ordered for site are breaking off and the sales guy is giving me the run-around. Could anyone provide a breif description of the process of manufacture? Or if there is a "net...

We are required to bolt a 1/2" aluminum flange to mild steel angle in an outside situtation in a mildly corrosive envirnment. What would you recommend for gasketing: - between the flanges - under the bolt washers - around the bolt shanks The bolts are nominally loaded. Thankyou

Post your quiry to the welding foram. They will be able to tell you what the weld will do to the metal.

Historically where and how was the term "gauge" derived and what does it really mean in terms of metal thickness?

We need to hydro blast steel prior to appling an epoxy primer. Do we need sand injection for adequate profile or will it stick to the steel with water blast only? If sand injection is needed, what kind of grit, what size, and how much sand to use?

How do I figure out the diamter size of a screw without having to measure the screw? Where do I find a chart of screw number to diameter? Thank you.

WHAT IS THIS CODE? WHAT ARE THE BOLTS? WHERE CAN I FIND A REFENCE?

What are the standard lenghts for steel manufactured in Argentina? Is it 6 meters or 20 feet?

I have to weld a new galvanized slip on flange to an existing galvanized pipe. The pipe is vertical. The new flange will slip on from above and be welded around the bottom edge. What would be the best method of repairing the galvanizing?