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Full-Ball LM Guide Structural Beam Model JR

Since its LM rail has a cross- sectional shape with high flexural rigidity, this LM Guide can be used as a structural component.

  • Self-adjusting capability
  • 4-way equal load
  • Structural member rail

Size : 25,35,45,55

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Precautions on Use

Types

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  • Flange
  • Bolts mounted from above
  • Bolts mounted from below
Model JR-A
  • Flange
  • Bolts mounted from above

Basic load rating (kN): Basic dynamic load rating 27.6 to 121 / Basic static load rating 36.4 to 146
Size : 25,35,45,55

Model JR-B
  • Flange
  • Bolts mounted from below

Basic load rating (kN): Basic dynamic load rating 27.6 to 121 / Basic static load rating 36.4 to 146
Size : 25,35,45,55

Model JR-R
  • Bolts mounted from above

Basic load rating (kN): Basic dynamic load rating 27.6 to 121 / Basic static load rating 36.4 to 146
Size : 25,35,45,55

Features

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Structure and Features

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Balls roll in four rows of raceways precision-ground on an LM rail and an LM block, and end plates incorporated in the LM block allow the balls to circulate. Since retainer plates hold the balls, they will not fall out even if the LM block is removed from the LM rail.
The Model JR uses the same LM block as the Model HSR, which has a proven track record. The LM rail has a cross-sectional shape with high fl exural rigidity, and therefore can be used as a structural component.
Unlike a conventional LM Guide, whose LM rail is secured to a mounting surface with bolts when installed, model JR’s LM rail is integrated with the mounting base while retaining the same upper structure as LM Guide Model HSR. The lower part of the LM rail has a hardness of 25HRC or less, making it easy to cut and enabling the rail to be welded.
When welding the rail, we recommend using welding rods compliant with JIS D 5816 (suggested manufacturer and model number: Kobelco LB-52).

4-way Equal Load

Each row of balls is placed at a contact angle of 45° so that the rated loads applied to the LM block are uniform in the four directions (radial, reverse radial and lateral directions), enabling the LM Guide to be used in all orientations.

Can be Mounted Even Under Rough Conditions

Since the center of the cross-section of the LM rail is slightly thinner, even if the parallelism between two rails is not accurate the LM rail is capable of absorbing the error by bending inward or outward.

Sectional Shape with High Flexural Rigidity

Since the LM rail has a sectional shape with high flexural rigidity, it can also be used as a structural member. In addition, even when the LM rail is partially fastened or supported in cantilever, the distortion is minimal.

Second Moment of Inertia of the LM Rail

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Geometrical moment
of inertia

I [×10 5 mm4 ]

Modulus of
section

Z [×10 4 mm3 ]

Height of
gravi-
tational
center

H[mm]

AboutX axis

AboutY axis

AboutX axis

AboutY axis

JR 25

1.90

0.51

0.69

0.21

19.5

JR 35

4.26

1.32

1.43

0.49

24.3

JR 45

12.1

3.66

3.31

1.04

33.1

JR 55

27.6

6.54

5.89

1.40

43.3

Detailed information for each model number

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Dimensional drawing/Dimensional table

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Benefit 1: Useful features

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Products Contents
LM Guide LM rail standard lengths and maximum length, tapped-hole type LM rail, frame for LM rail clamps, steel plate for LM rail clamps, etc.
Ball Screw Axial clearance, maximum manufacturing length of shaft, etc.
Actuator Movable part mass, etc.

Standard Lengths and Maximum Lengths of LM Rails

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THK Online Services
Member-Exclusive Content

These contents can be accessed

after registering as a member.

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Benefit 1: Useful features

  • Easy product comparisonsHighlight feature
  • Save items for laterreview Favorites feature

Benefit 2: Exclusive content

Products Contents
LM Guide LM rail standard lengths and maximum length, tapped-hole type LM rail, frame for LM rail clamps, steel plate for LM rail clamps, etc.
Ball Screw Axial clearance, maximum manufacturing length of shaft, etc.
Actuator Movable part mass, etc.

Model JB frame for LM rail clamps

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THK Online Services
Member-Exclusive Content

These contents can be accessed

after registering as a member.

Log in/Register Click here for THK Online Services details

Benefit 1: Useful features

  • Easy product comparisonsHighlight feature
  • Save items for laterreview Favorites feature

Benefit 2: Exclusive content

Products Contents
LM Guide LM rail standard lengths and maximum length, tapped-hole type LM rail, frame for LM rail clamps, steel plate for LM rail clamps, etc.
Ball Screw Axial clearance, maximum manufacturing length of shaft, etc.
Actuator Movable part mass, etc.

Model JT steel plate for LM rail clamps

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THK Online Services
Member-Exclusive Content

These contents can be accessed

after registering as a member.

Log in/Register Click here for THK Online Services details

Benefit 1: Useful features

  • Easy product comparisonsHighlight feature
  • Save items for laterreview Favorites feature

Benefit 2: Exclusive content

Products Contents
LM Guide LM rail standard lengths and maximum length, tapped-hole type LM rail, frame for LM rail clamps, steel plate for LM rail clamps, etc.
Ball Screw Axial clearance, maximum manufacturing length of shaft, etc.
Actuator Movable part mass, etc.

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