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Screw Thread Insert (STI) taps are dimensionally oversize and utilize a larger tap drill size so that thread they produce will accommodate a helical screw thread insert
Additional Information: #176 SAE
Additional Information: 20 ft Length
Connection Size 3: 5/8-in
#26,COBALT SCREW MACHINE DRILLS - 380C tool Screw Thread Insert (STI) tapsWhen metal parts are machined on centers, as in turning or cylindrical grinding, it is always necessary to drill and countersink the center holes to serve as seats or bearings in the machine centers.
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