Trying a drill the next size up drops the thread percentage causing ripped threads at assembly. 5 holes in aluminum with 75 thread percentage. TAP SIZE CUTTING TAPS TRU-FLO FORMING TAPS INCH METRIC DRILL SIZE DECIMAL EQUIVALENT DRILL SIZE DECIMAL EQUIVALENT 0-80 3/64. Long time Forum reader, first time poster. TAP DRILL CHART PHONE: 1-80 FAX: 1-80 WEB: Imperial has made a concerted effort to provide accurate information in its catalog and on its website, however Imperial assumes no responsibility for the accuracy of the information. Reaming helps control hole size but is not required. Tap Drill Chart Drill sizes given are the ‘closest’ drill size. 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. trim, drill, and tap metal stock to fabricate machine tools and form. The bottom of the hole may have partially formed crests with open “RABBIT EARS”. Observes size, shape, and color of heated spikes and adjusts dies and guide. 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. Tapered holes require the most torque and HP for tapping. Tapered hole may be drilled, reamed or cored. Thread forming taps can be very effective when used properly. Download Tap Drill Chart for Aluminum, Brass, Plastic as a PDF. Dimensions are shown for both plug and bottoming taps. Download Tap Drill Chart for Stainless Steel, Iron, Steels as a PDF. 3/4 - 1-1/2 pitch of insert 'set down' to allow for maximum production tolerance. 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. Use this chart from Kodiak Cutting Tools for reference with thread forming tap drill sizes. The minimum drilling depths shown below allow for the following recommended practices: Countersinking the drilled hole to prevent a feather edge at the start of the tapped hole.Hole Size for Metric Cutting Taps Calculate Hole Size for Inch Forming Taps. There are two choices in the hole preparation for a Jarflo tapered pipe tap: OSG offers drills, taps, end mills and indexable cutting for a wide variety. 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. Thread Calculator and Chart for metric thread, npt thread, bsp thread, unf thread, unc thread, acme thread, bspp thread, un thread, bspt thread, pipe thread, stub acme thread and buttress thread.Jarflo roll form pipe taps (NPT & NPS) have significant advantages over cutting taps in many applications.
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