Thread Reference & Calculator

The thread chart and tap drill reference you actually want on the shop floor. Thread Reference & Calculator puts every thread standard, machining calculator and thread identifier in your pocket — ready in seconds, no internet required.

Machinists, CNC programmers and engineers use it daily: to identify an unknown thread by caliper measurement, look up tap drill sizes, calculate cutting parameters and reference specs across 27 thread standards — all without leaving the shop floor.

Thread chart & tap drill chart

Look up pitch, TPI, major/minor diameter, tapping drill, clearance drill and more. Covers Metric, UNC, UNF, UNEF, UNS, UN, BSW, BSF, BSPP, BSPT, NPT, NPTF, RC, ACME, Stub ACME, Trapezoidal, Buttress, Knuckle, Worm, API and other standards — all in one place.

Thread identifier by measurement

Got an unknown thread? Measure with calipers, enter the diameter and TPI — the app instantly matches it across all supported standards.

Thread profile diagrams

Clear SVG diagrams for each thread type — see the geometry, understand the form, spot the differences between standards at a glance.

CNC & machining calculators

Cutting speed, spindle speed, feed rate, feed per tooth, feed per revolution, machining time, material removal rate, cutting power, torque, depth of cut — for turning, milling and general workshop setup.

Geometry calculators

Cone dimensions, hex and square blanks, coordinate rotation, trig values and degree conversions.

Engineering references

GD&T drawing symbols, Fe-C diagram, material melting temperatures, hardness tables and bearing fits.

Works offline

Every chart, table and calculator works without a connection. Perfect for workshops, production floors and CNC setup where Wi-Fi isn't always an option.

Favorites

Save the threads and calculators you use most for instant access.

Built for real shop floor use — whether you're identifying a mystery thread, setting up a CNC job, calculating feeds and speeds, or just need a tap drill size fast.