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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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Deep-thread screws...
Awl --
I think the whole sheetmetal/drywall screw thing is resolved with the "deep thread" class of screws: http://www.gardensheds.greenhouses.a...ew-threads.htm http://www.theindustrialdepot.com/de...ead-screw.html For example, a coarse sheetrock screw measures .094/.146 minor/major diam The drill-point sheetmetal screw (that I wound up using) measures .130/.165. So the SR screw, being a deep thread, has *a lot* more bite. McNeely's has a variety of deep thread screws. One section is he http://www.mcfeelys.com/search/fsl , altho it's not clear just how deep is deep. In http://www.mcfeelys.com/tech/dimensions.htm , it's not clear if "B" (their body diam) is the same as the root diam. If so, this is not as deep a thread as the name suggests. McNeely's deep-threads (inch length) are about $20/1,000 -- McNeely's seems pretty reasonable. But here's the Q: Can I get REALLY deep thread screws? What would they be called, or their application classification? I'm thinking on the order of .125/.200, ie, about .040 grabbing on the radius. I've hunted around, but haven't come across anything deeper than the reg. deep thread spec. Any ideas of what a custom run of screws might cost? Quan, $$ ? I'm thinking if I ordered a standard #12 or #14 screw, and asked them just to set the machine to cut a little deeper, I'd get the screw I wanted.... Iny ideas on who might do this? -- EA |
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