There are a variety of standards used to define drill sizes, the most common one in the UK is the British Standard BS 328 set which includes twist drill bit sizes between 0.2 mm and 25 mm.īS 328 drill sizes are defined as shown in the drill size chart below: ø0.2 to 0.98 mm: Metric drill sizes are used primarily in Europe and use metric units to measure the drill bit diameter. To get an accurate measurement, use Vernier callipers, but be aware that depending on the quality of the drill bit, there could be a tolerance error of between 5 and 15 thousandths of a unit. Thinner wall thickness can be used because of their smaller thread cross section.To measure the diameter of a drill bit, it’s best to measure the cutting edge rather than the shank (the shank is the part that is held by the drill chuck). Where length if engagement is limited, they provide greater strength. They can adjusted more precisely because of their smaller helix angle. In very hard materials, Fine threads are easier to tap. They are about 10% stronger than Coarse threads due to their greater cross-section areas. Fine Threadsįine threads may make for superior fastener for applications with specific strength or other requirements. More easily tapped in brittle materials and or materials that crumble easily. Less prone to strip when threaded into lower strength metals. They are less likely to seize in temperature applications and in joints where corrosion will form. Nicks and burrs from handling are less liable to affect assembly. (This is the most widely used style)īottoming Tap One to two threads chamfered to use after threads have been started for tapping to the bottom of a hole.įor most applications, Coarse Threads offer theses advantages:Įasier and faster assembly, providing a better start with less chance of cross threading. Tapping into the bottom of the hole is not critical. Plug Tap Three to five threads chamfered for general use when Taper Tap Seven to ten threads chamfered for easy thread starting in tough materials. On materials that produce chips, or where the swarf breaks readily. They are generally the most economical tool for use on production runs, but are best Straight flute are general purpose tools to be used for hand tapping. Please contact customer service 1-80 to find the nearest distributor. TAPS – Industrial Coated - HSS Machine Screw/Fractional: TiN Spiral Point Plug TiN Taper - Straight Flute TiN Plug - Straight Flute TiN Bottoming - Straight Flute SET - TiN Straight Flute - METRIC HSS Machine/Fractional Taps: TiN Taper Straight Flute TiN Plug Straight Flute TiN Bottoming Straight Flute SET - TiN Straight Flute - HSS Semi–Bottoming Taps: TiN 52° Hi–Helix Taps TiCN 52° Hi–Helix Taps - HSS High Performance Taps: TiN Reduced Neck TiCN Reduced Neck ALTiN Reduced Neck - HSS Taper Pipe Taps: TiN Regular NPT Taper Pipe TiN Interrupted NPT Taper Pipe Gold Oxide Interrupted NPT Taper Pipe - HSS M42 Cobalt Taps: M42 Cobalt TiN Plug Tap - Tap Wrenches: T-Handle Tap Wrench Ratcheting T-Handle Tap Wrenchĭrill and Tap Support: DRILLS – Feeds and Speeds TAPS – Feeds and Speeds Drill Troubleshooting Tap Troubleshooting Our products are only sold through distributors. 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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