Reaming helps control hole size but is not required. Straight pipe threads can be form tapped using only a high quality drilled hole.Straight hole procedure will reduce tapping torque and improve tool life. The benefits of burnished, high quality threads at the top of the hole provide excellent sealing capability for the part. The bottom of the hole may have partially formed crests with open “RABBIT EARS”. The straight hole method will result in a full, sharp-crested threads at the top of the hole. The Jarflo tap will ultimately produce the proper tapered thread by forming the material from the top to the bottom of the hole. Straight Hole – many applications for tapered pipe threads may use a straight hole.Tapered holes require the most torque and HP for tapping. Tapered hole may be drilled, reamed or cored. Tapered Hole – A pre-tapped tapered hole will result in a consistent percent of thread height the entire depth of thread in the piece part.There are two choices in the hole preparation for a Jarflo tapered pipe tap: It is not practical to thread form NPTF & NPSF threads because 100% thread is required, and the crests need to be fully formed. These benefits include improved thread finish, stronger threads, longer tap life, faster tapping speeds and no chips. The result is 4.0 mm - 0.8444 mm = 3.1666 mm, which is the necessary diameter for the drilled hole.Jarflo roll form pipe taps (NPT & NPS) have significant advantages over cutting taps in many applications.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 standard 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. Find Thread Forming Tap: M12x1.75 Metric, 6HX Class of Fit, Modified Bottoming, Cobalt, TiN Coated at MSC Industrial Supply, serving the metalworking. 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. M12x1.75 59 88 99 99 M14x2 94 139 158 158 M16x2 146 210 250 250 M18x2.5 210 285 341 341 M20x2.5 292 401 489 489 DecreaseValues15-25forlubricatedorplatedbolts BoltGrades,TorqueSpecs MetricTap&DrillChart METRICTHREADSIZES ThreadSize LOSANGELES 81 SANDIEGO 85 ORANGECOUNTY 94 INLANDEMPIRE 95 PHOENIX 602.Look up the TPI and desired thread percentage to determine the corresponding outer diameter.The chart below is for standard 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 standard male threads when making a bolt or threaded pipe. Use the corresponding drill size to drill the hole.
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