Ball Screw Sizing Calculator

Calculate ball screw lead, torque, life, and critical speed for linear motion applications per ISO 3408.

Maximum axial force on the ball screw.
N
Linear travel per revolution. Common: 5, 10, 20 mm.
mm/rev
Operating speed of the screw shaft.
rpm
From manufacturer catalog.
N
Distance between bearings.
mm
Root diameter of ball screw shaft.
mm

Results

Drive Torque-N·m
Linear Speed-mm/s
L10 Life-million rev
Life in Hours-hours
Critical Speed-rpm
References: ISO 3408 — Ball Screws; THK/NSK Catalogs