Screw Thread Calculator
Calculate thread pitch, lead, and mechanical advantage for threaded fasteners
About this calculator
The Screw Thread Calculator is an essential tool for engineers, machinists, and technicians working with threaded fasteners. It accurately calculates critical thread parameters including thread pitch (distance between adjacent threads), lead (axial distance traveled per revolution), and mechanical advantage (force multiplication ratio). This calculator helps ensure proper thread selection for specific applications, optimizes fastener performance, and assists in designing threaded connections that meet precise engineering requirements for strength, torque, and mechanical efficiency.
How to use
Enter the thread specifications including major diameter, threads per inch (TPI) or metric pitch, and thread type. The calculator will automatically compute the thread pitch, lead value, and mechanical advantage ratio. Use these results to verify thread compatibility, determine torque requirements, or select appropriate fasteners for your specific application needs.
Frequently asked questions
What's the difference between thread pitch and lead?
Thread pitch is the distance between adjacent thread crests, while lead is the axial distance a screw advances in one complete revolution.
How does mechanical advantage relate to thread design?
Mechanical advantage shows how much a threaded fastener multiplies applied force, with finer threads typically providing greater mechanical advantage for increased clamping force.
Can this calculator handle both metric and imperial threads?
Yes, the calculator works with both metric threads (specified by pitch in millimeters) and imperial threads (specified by threads per inch).