Calculators for machinists and engineers

Find the right tap drill size for metric, UNC and UNF threads, at any thread percentage, with the nearest standard drill and the thread it gives.

Work out the tightening torque and clamp force for metric and UNC/UNF bolts by grade and lubrication, from 4.6 to 12.9 and SAE Grade 2, 5 and 8.

Find the X and Y position of every hole on a bolt circle or pitch circle diameter (PCD), plus the angle and distance between neighbouring holes.

How many turns of a screw or thread to move a set distance, or how far a number of turns moves it: metric, UNC, UNF or any pitch, in turns and degrees.

Work out a gear ratio from the number of teeth, and the output speed and torque from the input, allowing for efficiency.

Work out how much a simply supported or cantilever beam bends under an even or point load, with the bending moment, for timber, steel and more.