Thread Chart: Tap Drill & CNC

Siberian Apps

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About this app

The thread chart and tap drill reference you actually want on the shop floor. Thread Chart & CNC 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 speeds and feeds, and reference specs across 27 thread standards — all without leaving the shop floor.

THREAD CHART & TAP DRILL CHART
Look up any thread size chart entry: pitch, TPI, major/minor diameter, tapping drill, clearance drill and more — and find the right drill bit size for any tap. From metric thread charts to 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 diagrams for each thread type — see the geometry, understand the form, spot the differences between standards at a glance.

CNC & MACHINING CALCULATORS
Full speeds and feeds calculator: cutting speed, spindle speed (RPM), feed rate, feed per tooth, feed per revolution, machining time, material removal rate, cutting power, torque and depth of cut — for lathe 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 thread chart, table and calculator works without a connection. Perfect for workshops, production floors, lathe 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 machinists and real shop floor use — whether you're identifying a mystery thread, setting up a lathe or CNC job, calculating feeds and speeds, or just need a tap drill size fast.

Ratings and reviews

Works great and tons of info. One more star if updates get made to go one step above everyone else in this space.. would be fantastic if the calculations that are auto generated are also applied to to the thread profile image. For the moment we still get the typical image with formulas (5h/8, p/8, etc), why not let the app do the rest of the calculations.. would gladly purchase a pro version if such a tool were available.

I use this app at work mostly to figure out ID and OD for machining threads. So far it's worked great. I can't tell on the rest of the app as I haven't explored or needed the rest of it.

Like the update. Very useful at work. 5 stars. I Would like to see the hole size needed for the chosen thread make a return.

What’s new

Added NKTP 1260 thread
New reference tables: cutter and drill point angles
Fixed UN/UNS thread tolerances
Bug fixes and interface improvements