Proudly Manufactured in the USA with globally sourced materials Tapping Formulas and Calculations RPM for UNC/UNF Feed Rate for UNC/UNF Taps RPM for M/MF Taps Feed Rate for M/MF Taps Recommended Feeds and Speeds (SFM) into Material Recommended Feeds and Speeds table below suggests a "starting point" for selecting the speed to operate the tap. Vertical tapping speeds can be increased, compared to horizontal tapping. Holes, taps with tapered chamfers are able to operateįaster than taps with bottoming chamfers. Speeds must be reduced as length of hole increases. The optimum speed for tapping is highest speed that conditions permit,Ĭonsistent with acceptable tool life. Proper tapping speeds are very important in obtaining efficient tapping results. Cutting taper threads (50% Normal Speed). Bottom lead or Spiral flute taps are used.Lubricant is Poor or Flow is Restricted.RPM = Feed Speed (SFM) / 0.26 x Tap's Outer Dimension Tapping speeds should be Tapping Speed can be calculated using: (Use Table below) Check hardness of material, especially when changing batches of material.Keeping taps sharp, check tap for wear.Use the correct tapping drill size and type of tap.Choose the correct lubricant (Choose – Ultra S/P ™ Super Premium).Use a pitch controlled tapping attachment.TAP FEEDS & SPEEDS How to Tap Effectively and Optimize Tool Life To minimize tapping issues the following rules should be followed:
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