Engineering Calculators

Internal engineering calculation tools

O-Ring icon

O-Ring Calculator

Calculate male and female O-ring gland dimensions per Parker Handbook. Supports static and dynamic applications with tight and loose tolerance modes.

Thread icon

Thread Calculator

Calculate UN (UNC, UNF, UNEF, UNS), Stub ACME, and SLB thread dimensions and tolerances per ASME B1.1 / B1.8.

Spring icon

Spring Calculator

Calculate compression (round and rectangular wire), extension, and torsion spring geometry, rates, stresses, and buckling per Shigley's / SMI / Wahl.

Lock mandrel icon

API 14L Lock Mandrel Calculator

Validate lock mandrel assemblies per API 14L 3rd Edition. Computes Von Mises combined stress, collapse, bearing, and thread strength for all components with capability ratings and NDE requirements.