![]() ![]() Note that a plug or taper tap needs to be used to cut threads first and that a bottoming tap should not be used to start a thread. Metric Tap and Drill Bit Size Table 14mm x 1.5, 12.7mm, - 16mm x 2.0, 14.2mm, 35/64 16mm x 1.5, 14.7mm, - Drill sizes are for 75 depth of thread. Bottoming taps only have 1-1.5 tapered threads and are most useful when tapping blind holes that need threads to the bottom of the hole. They are useful as a general purpose tap for ferrous and nonferrous materials. Plug taps are the most commonly used taps, having around 3-5 tapered threads. ![]() Drill sizes for tapping chart - NEW.cdr Author: Belindas Created Date: 4:05:26 PM. They are useful for hard and difficult-to-work materials. in mm Drill Size in mm Drill Size TPI TPI TPI in mm Size BSW BSF BSB Drill Size in mm Drill Size TPI TPI in mm BSP BSPT 1/16 3/32 1/8 5/32 3/16 7/32 1/4 9/32 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 7/8 1' 1.1/8. Taper taps have around 8-10 tapered threads, providing a relatively gradual cutting action. Each refers to the amount of tapered threads at the start of the tap. Tap styles - There are three different kinds of hand taps: taper, plug, and bottoming. Metric Tap Chart Tap Drill Clearance Drill Aluminum, Brass, Plastics Steel, Stainless Steel, Iron Close Fit Standard Fit 75 Thread 50 Thread Screw Size. The tables below also list the standard sizes for both close and free clearance holes. The process generally includes using a spot drill or center drill to create a divot, drilling a pilot hole (see the chart below for the proper size "tap drill"), then using the tap to produce the threads. Tapping - This is the process of cutting threads on the inside of a part, and is typically done with a fluted tap. In general, this is redundant with the pitch (threads per inch), and could be omitted from an engineering drawing, but is often there to provide some redundancy in specifying the desired thread. In the context of American (non-metric) screw threads, the common standard is "Unified National", and comes in four flavors: Course (UNC), Fine (UNF), Extra Fine (UNEF), and Special (UNS). ![]() Screw Threads - To ensure that parts will fit together as designed, we often rely on pre-defined standards. ![]()
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