THK LRA / LRA-Z Series LM Roller

The LM Roller is a heavy-load linear motion guide in which contoured rollers circulate infinitely along a precision-ground, high-rigidity raceway base while being retained by a cage. A center guide integrated into the raceway base continuously corrects roller skew, ensuring smooth and stable rolling motion even under high loads.

LM Rollers are widely used in NC machine tool XYZ guides, precision press ram guides, press die changers, and heavy-load transfer systems, where high rigidity, durability, and smooth motion are required.

The LRA Model LM Roller is a compact groove-mount type designed for space-constrained installations. Like the LR series, it fits into a machined groove and can be mounted using fixture models SM or SE and bolts. The LRA-Z variant uses a resin retainer for reduced weight and includes a seal groove for easy installation of a contamination-resistant rubber seal. The LRA series also supports high-speed operation of up to 1 m/s.