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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Included angle of drywall screw head?
Drywall screws probably aren't a good choice for much more than wood or
their intended use (although they do self-drill thru fiberglas nicely). The bad feature of most DW screws is that they're brittle, and just snap. I prefer to use decking screws (for wood projects), which will typically bend before breaking, but testing a chosen brand? (likely to be imported) is probably a good idea. The way the heads are transitioned from the shank isn't very consistent for either type.. there may be a radius as mentioned, or a combination of a countersink that blends into a tapered section. You've neglected to mention what materials are to be fastened, but quality countersunk-head machine, sheetmetal or wood screws will likely have more accurate/better matching head geometry for a machine-cut countersunk hole. If this fastening task is related to an earlier situation of applying a thin, hard skin over a soft substrate, I'd expect DW screws to be about the worst choice. -- WB .......... "Existential Angst" wrote in message ... Dayum.... google has not been my friend.... nor Bing.... I found the included angle of bugle head drywall (60-63 deg, fyi), but not of regular head drywall screws. The reason I'm looking is to get the right spot drill or c-sink... MSC carries 82 deg spot drills, as well as a variety of other angles. Not all FH screws are 82 deg... I was informed that metric FH are in fact 90 deg, some sheetmetal stuff 100 deg, and some aircraft stuff 120 deg. Which also raises the Q: where did 82 deg come from? 90 deg shore makes sense to me!! -- EA |
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