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The difference between SP & +SP Taps

【英】困ったときの知恵袋詳細
Cutting Taps How to use
How I can distinguish between when to use a SP tap or a +SP tap? Which one can be used for general purpose?
Both can be used in a general purpose application. Here is the main difference. The SP taps are for low to middle tapping speeds in radial arm drilling machines and machining centers using a floating tap holder or one with a tension/compression mechanism. The +SP taps are for middle to high tapping speed in machining centers but a ridged holder with synchronous feed is recommended.

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