THK roller follower shown in cutaway, stud-type cam follower shown in cutaway, and a flanged ball spline nut on a splined shaft, alongside the red THK logo

THK — Linear Motion Guides, Ball Screws and Precision Motion Components

About THK

THK Co., Ltd. is a Tokyo, Japan based manufacturer of precision machine components, established in 1971. The company developed the world's first LM Guide (linear motion guide) in 1972, and it remains the global market leader in linear motion technology. THK LM Guides, ball screws, and ball splines are used worldwide in machine tools, industrial robots, semiconductor manufacturing equipment, and automation systems.

Niche / Flagship Products

LM Guide (Linear Motion Guide)

THK's signature profiled rail guide, which replaces sliding contact with rolling contact to deliver smooth, high-rigidity, high-precision linear motion.

Caged Ball Technology

A patented design that separates balls in resin pockets to reduce friction and wear, retain lubricant, lower noise, and extend service life.

Caged Ball LM Guides (SHS, SSR, SHW series)

High-performance caged ball linear guides for machine tools, robotics, and high-speed automation.

Caged Roller LM Guide (SRG series)

Roller-type linear guides built for ultra-high rigidity and heavy loads in demanding machine tool applications.

Ball Spline

A linear bearing that transmits torque while moving along a splined shaft, used in robot arms, pick-and-place units, and assembly machinery.

Cross Roller Ring (RB, RU series)

Compact rotary bearings with crossed cylindrical rollers that handle radial, axial, and moment loads in a single unit.

Specialized Product Categories

Linear Guides and Profiled Rail Systems

Standard, wide, miniature, and roller-type LM Guides for linear positioning across all industries.

Ball Screws

Precision and rolled ball screws, including caged ball high-speed types, for converting rotary motion into accurate linear motion.

Ball Splines

Linear-and-rotary motion components for torque transmission with linear travel.

Cross Roller Guides and Cross Roller Rings

Compact, high-accuracy guides and bearings for precision stages, rotary tables, and robot joints.

LM Bushings and Linear Shafts

Linear ball bushings for simple, low-friction linear motion on round shafts.

Electric Actuators

Integrated units combining LM Guides and ball screws (such as the KR and SKR series) for ready-to-install linear positioning.

XY Tables and Precision Stages

Multi-axis positioning units for inspection, semiconductor, and assembly equipment.

Other Products & Capabilities

Link Balls and Rod Ends

Spherical joint components for linkages, steering systems, and mechanical control mechanisms.

Automotive Components

Linkage and suspension parts, with linear motion technology applied to next-generation steering, braking, and suspension systems.

Seismic Isolation Devices

Isolation systems that protect buildings and critical equipment from earthquake vibration.

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