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Cut-thread tap holes must be oversized by 5.5% to 0.602 in. before their strength dips below 35,000 lb. Holes oversized by nearly 1/32 in. still retained 72% of the best strip-out strength.
The three performance levels cover the product designations of T32 and T34 in thread cutting taps and T33 in forming taps. At the base level are universal general-purpose type taps. The second T34 mid ...