![]() For example: 3/4– 0.0625 P – 0.1875 L UNF denotes a 3/4″ UNF thread with 3 starts. For a multiple-start thread, the lead is also indicated. Number of Starts: By default, all threads have a single start.For a left-hand thread, add the suffix -LH. Direction: By default, the thread is right-hand.For a detailed explanation of classes, read the dedicated section below.3=Tight fit, 2=Medium fit, and 1=Loose fit. The first character is a digit between 1 and 3.The class is defined by a two-character code.The pitch remains the same for the whole diameter range in these series. ASTM B1.1, also defines several constant pitch series.In most cases, the series will be UN C, UN F, or UN EF (Coarse, Fine, or Extra fine pitch).For example, 1/4-0.05P means a thread with a pitch of 0.05″ (same as 20 TPI). It is also allowed to denote the pitch by distance.For example, 1/4-20 means a thread with a pitch of 20 TPI (1/20=0.05″). By default, the pitch is given in TPI.Subtract the result from the thread diameter (4.0 mm).Match this row to the 65% thread percentage column.Look for the 1.00 mm pitch in the chart's first column.For metric threads, the recommended thread percentages are 65% and 70%.įind the drilled hole size for a 65% thread on a 4 mm x 1.00 (M4) tapped hole:.Similar to the unified tap and drill section (see above), use the two formulas below to calculate the necessary size of the drilled hole.Look up the desired pitch and thread percentage to find the corresponding outer diameter.The tap and drill chart below is for Metric threads. 5 millimeters, the double thread depth is 1.0 millimeter. In the second method, double thread depth means twice the depth of the thread.For either formula, when inputting thread percentage, use, for example, 65% instead of 0.65. Use the two formulas below to calculate the necessary drilled hole size in inches.The recommended thread percentage is 65%, 70%, and 75%.Thread percentage is the percentage of a bolt's shank that has threads.Look up the TPI and desired thread percentage to determine the corresponding outer diameter.The chart below is for unified gauge threads (inch). Based on the desired nominal size, look at the desired standard column to determine the minimum outside diameter of the component for the threads.Use the thread nominal size column to identify the desired thread designation.The following chart describes how to determine the size of unified male threads when making a bolt or threaded pipe. ![]() Use the corresponding drill size to drill the hole.Identify the screw designation, which correlates with the tap size on the chart.The chart below is used for tapping female threads into a component. Tamesons selection of thread cutting tools
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