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
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?
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?