SNR/SNS - Caged Ball LM Guide - Ultra-rigid LM Guide for Machine Tools

Nov 2, 2026

SNR/SNS Ultra-rigid LM Guides with Caged Ball™ technology provide high-speed performance with a low-noise design. The caged ball concept reduces ball-to-ball friction, stabilizes lubrication via an oil-film-friendly contact behavior, and minimizes heat generation at high rotation. The catalog highlights maintenance-free long-term operation, reduced rolling-resistance variation for improved accuracy, and fitting measurements aligned with DIN 645 for types SNR-H and SNS-H.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages28

Reading Time1 h 11 min

AccessFree to download

Ultra-rigid LM Guide for Machine Tools

Key features of SNR/SNS

Caged Ball™ technology concept

Noise and rolling resistance performance

Special quality of SNR and SNS

SNR/SNS Caged Ball LM Guide Ultra-rigid LM Guide® for Machine Tools ■ High speed performance ■ Low noise design ■ Reduction in rolling resistance variation ■ Fitting measurements according to DIN 645 ■ Long-term maintenance-free operation ■ Radius of curvature 51% Da THK CO . , LTD . TOKYO, JAPAN Catalog No. 234-7EU SNR/SNS Ultra-rigid LM Guide with Caged Ball™ Technology End plate | | | | | | --- | --- | --- | --- | | | | | | | | | | | | | | | | | | | | SNR | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Fitting mea
The fitting meas | surements also according to DIN 645
urements of the types SNR-H and SNS-H meet the standard DIN | 645. Therefore, these types are com- | Radial type Figure 1 Structure of types SNR/SNS Four way equal load rating type SNS patible with all standard roller as well as ball type linear motion guides. For very compact machine designs the extremely compact linear guides SNR and SNS are the best solutions. Roller guide SNR-H/SNS-H SNR/SNS according to DIN 645 according to DIN 645 (extremely compact) Flange type Compact type SNR/SNS C A G E D B A L L L M G U I D E Elimination of Ball-Friction with Caged Ball™ technology Ball Oil film contact Typical point contact Rotary ball bearing In the first stage of development (Full ball type) • Adjacent balls contact each other at a point. As a result, the contact stress is large and the oil film brakes down due to friction. • The life becomes shorter. At the time rotary ball bearings were invented, they Present bearing (With ball cage) • The life is extended due to the absence of friction. • Heat generation during high-speed rotation is limited due to the absence of the friction between adjacent balls. • The balls do not contact each other. Noise does not arise from the metal to metal contact. • Balls move smoothly because they are positioned evenly. • The lubricating oil retained between the balls provdes excellent lubrication and long life. point of contact, slip against each other in opposite direc- Linear motion guide Full ball type Caged Ball technology had no ball cages. This resulted in loud noise during operation, a short running life, and did not have the ability to be run at high speeds. 20 years later, rotary ball bearings with ball cages were developed. This type was quieter in operation and capable of high rotational speeds. Although containing less balls, it provided exellent running life and contributed to the major success of rotary bearings. The history of the needle bearing reveals how quality improved through the use of ball cages. Balls, at their tions and at twice the speed of each of their rotation. This resulted in severe wear, loud noise, and a short running life. The massive pressure from the metal to metal contact and slip between the balls also caused the oil film to break down. Alternatively, balls and ball cage contact each other over a large surface area and at half the relative velocity. This prevents the break down of oil and provides for quieter operation, higher rotational speeds, longer running life and extended maintenance. At , we utilized our many years of experience along with innovative manufacturing techniques to develop the new Caged Ball™ technology, and we have built this technology into the new generation of smooth-running LM guides. The main features of the new LM guides are as follows. Low Noise -Favorable Sound Quality Since the balls move in an orderly manner due to liecavna,lllbiesynir1aneqslullattlieegse,ihalanolisaloellusvneil Grease pocket Long Service Life, Long-term Maintenance-free Operation rrcnI,al,iihinseonvei,bilelcsrlrienoseserriljpirocoe,lcewasg-ianina. Ahanear-- Adjacent balls, separated by the ball cage, do not Excellent High-speed performance iapooeegedeedn dntad dtweloolltjiTie3iillliiiiicflaleensriiiaaslelill--

FAQs

What advantages does Caged Ball™ technology provide in SNR/SNS LM guides?

It eliminates friction between adjacent balls using a ball cage, extending life, limiting heat generation, and preventing metal-to-metal contact noise.

How do SNR/SNS address low noise at high speed?

The resin molded ball-circulating structure suppresses metallic noise from ball contact with the block and from balls hitting each other, enabling quiet operation even at high speed.

Are the fitting measurements compliant with DIN 645?

Yes. The catalog states that fitting measurements follow DIN 645, and types SNR-H and SNS-H meet the DIN 645 standard.

Nov 2, 2026

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