Threads & Taps calculators & charts
Tap drill sizes, thread engagement, pitch diameters, three-wire checks and threading cycles for ISO metric, Unified (UNC/UNF), Acme, Buttress, trapezoidal and pipe threads (NPT, BSPP and BSPT). Each calculator works from the published standard (ISO 68-1 for metric, ASME B1.1 for Unified, ASME B1.5 for Acme, DIN 103 for trapezoidal) and prints the formula beside the result, so you can check the number before you drill. If you only need a drill size, open the tap drill chart; when the material or the tap style changes the answer, use the engagement calculator.
All 19 Threads & Taps tools
29° Acme Thread Dimensions CalculatorCalculate 29-degree ASME B1.5 General Purpose and B1.8 Stub Acme thread dimensions, pitch diameter, minor core diameter, tool tip flat width, and 3-wire MOW.Open BSPP & BSPT British Pipe Tap Drill ChartComplete BSPP and BSPT 55° Whitworth British pipe thread tap drill chart and dimensions calculator.Open Blind Hole Tap Depth CalculatorBlind hole tap depth calculator for CNC machinists.Open Buttress Thread Dimensions CalculatorCalculate ASME B1.9 and DIN 513 Buttress thread dimensions, pitch diameter, root radius, and 3-wire measurement.Open CNC Thread Milling CalculatorUniversal CNC thread milling calculator. Computes internal and external centerline feed rate compensation, spindle RPM, and G02/G03 helical interpolation G-code.Open Fanuc G76 Threading Cycle CalculatorCalculate Fanuc 2-line and Haas 1-line G76 threading cycle parameters, minor core diameter X, integer micron P and Q words, and constant-volume pass depths.Open G84 Rigid Tapping Feed Rate CalculatorPrecision G84 rigid tapping feed rate and spindle speed calculator.Open Helicoil Tap Drill ChartHelicoil tap drill chart for metric and Unified threads.Open ISO Metric Trapezoidal Thread Calculator (DIN 103 Tr)Calculate ISO 2901, ISO 2903, and DIN 103 Metric 30° Trapezoidal screw thread pitch diameter, minor diameter, 7e/7H tolerances, and 3-wire MOW readings.Open Lathe Taper Per Foot (TPF) to Degrees CalculatorConvert lathe Taper Per Foot and Taper Per Inch into included taper angle, compound rest half-angle, and tailstock set-over offset.Open Master Tap Drill ChartExhaustive tap drill sizing chart for Unified UNC/UNF and ISO Metric coarse and fine threads.Open Metric Tap Drill ChartMetric tap drill chart covering ISO coarse and fine pitch threads from M1.6 to M36.Open Morse Taper Dimensions Chart (MT0 to MT7)Official ISO 296, DIN 228, and ASME B5.10 Morse Taper dimensions chart for MT0, MT1, MT2, MT3, MT4, MT5, MT6, and MT7 shanks and sockets with interactive calculator.Open NPT Pipe Tap Drill ChartNPT pipe tap drill chart covering 1/16-inch to 2-inch NPT.Open Roll Form Tap Drill ChartRoll form tap drill chart for metric and Unified threads.Open Spiral Point (Gun Tap) vs. Spiral Flute Tap Chart & Selection GuideCompare Spiral Point vs. Spiral Flute taps across DIN 2181 chamfer forms, helix angles, chip evacuation, and blind-hole clearance.Open Thread Engagement Tap Drill CalculatorThread engagement tap drill calculator and shear strength guide.Open Three-Wire Thread Measurement CalculatorMaster three-wire thread measurement calculator for 60° Unified/Metric, 29° Acme, and 55° Whitworth threads.Open Unified Thread Class 2A/2B vs 3A/3B Tolerance Calculator (ASME B1.1)Calculate ASME B1.1 Unified inch screw thread Class 1A, 2A, 3A and 1B, 2B, 3B pitch diameter limits, plating allowance, and major/minor tolerances.Open
Other drawers
Every result on these pages comes with its formula and the standard behind it. How the numbers are computed and checked is described in the calculation methodology.