(Solved) - Screws for Case fan/Radiator(20 posts)
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By shoulder, I'm referring to the unthreaded portion of the screw. I'm guessing you are right about the blind holes which is why I said the lengths must match. One advantage to your suggestion about using all-thread is the rods can be preinstalled in the radiator and the fan slipped over the rods before inserting the rod ends into the case holes; 'twould be less of a juggling act.
It's also called a shank here. Six of one, half a dozen of another although shoulder is also used to refer to a precisely machined shank, often larger in diameter than the threads. Wood screws here still have an unthreaded shank and a thread that is tapered at the end. We can still get drill bits that have the same tapered end here.
Haven't seen a three in one in years. Those are more common in assembly line work. More common now is to use the tapered bit to drill the pilot hole and a straight bit to open up the clearance hole for the shank. A separate counter sink is cheaper but the pros use a counter stop countersink that slips over the bit and both acts as a countersink and a bit stop collar. I was also professionally trained and worked in cabinet shops for a while after getting out of college.
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