AirTAC LSH25RLX Rail | 25mm Interchangeable High-Precision Rail 60mm Hole Pitch

Model: LSH25RLX (LSH25R-Length-X)

1. Executive Summary

The AirTAC LSH25RLX refers to the 25mm standard linear guide rail body (rail only, block not included) in the LSH series.

It serves as the "foundation" of the entire linear motion system. Manufactured from high-carbon chromium bearing steel and subjected to precision grinding and induction hardening, the rail surface hardness reaches HRC58-62, ensuring extremely high wear resistance and straightness. This rail is specifically designed to be used with LSH25 and LSD25 series blocks, suitable for automation equipment bases requiring long distance and high-rigidity support.

2. Model Code Decoding

Click to download the catalog

How to interpret LSH25RLX:

• LSH: Series Name — High Assembly Standard Linear Guide Series.

• 25: Size Specification — Nominal width 25mm.

  • Actual Dimensions: The physical rail width is 23mm, and the height is 22mm (conforming to international standard 25 size specifications).

• R: Component Type — Rail.

  • This indicates you are ordering the rail separately, typically for old rail replacement or self-assembly with separately purchased blocks (e e.g., LSH25BK-D).

• L / LX: Length Definition (Length / Custom).

  • In ordering, this will be replaced by a specific numerical value (e.g., LSH25R1000). "LX" signifies that the rail length is customizable, allowing you to cut it to lengths ranging from 100mm to 4000mm according to the machine requirements.

  • X may also denote special processing (such as rail jointing or special hole pitch), but in the general context, it signifies "any specified length."

3. Core Technical Specifications

These are critical data points for mechanical design and drilling:

• Rail Width ($W_1$): 23 mm (Note: Nominally 25, actual width 23, which is standard industry practice).

• Rail Height ($H_1$): 22 mm.

• Mounting Hole Pitch (P): 60 mm.

  • Important: The mounting holes on the rail are spaced 60mm apart.

• Mounting Hole Size: 7 x 11 x 9 mm (Counterbore Hole).

• Compatible Bolt: Secured using M6 socket head cap screws.

• Material: GCr15 High-carbon chromium bearing steel.

• Hardness: HRC 58~62 (Induction hardened layer).

• Accuracy Class: Optional N (Normal), H (High), P (Precision).

4. Key Benefits

A. International Standard Interchangeable Dimensions

The AirTAC LSH25R rail is manufactured strictly according to international industry standard dimensions.

• Interchangeability: Although it is theoretically recommended to use matching brand components for optimal precision, the LSH25R's mounting hole pitch (60mm) and screw specification (M6) are completely consistent with competitor products like HIWIN HGH25 or THK HSR25. This means you can install it directly onto existing machine frame holes without redrilling.

B. High Rigidity and Straightness

The rail undergoes deep hardening treatment, providing not only wear resistance but also extreme resistance to bending (high bending rigidity). In long-distance applications (e.g., over 2 meters), it maintains excellent straightness, preventing wavy motion or vibration during block operation.

C. Flexible Custom Length (Custom Length)

The meaning of "LX" lies here. Standard rails are usually shipped in fixed 4-meter lengths but can be cut to any length required by the customer (e.g., 850mm, 1260mm). End distance (E value) can also be handled to ensure symmetry of the end mounting holes or compliance with specific drawing requirements.

D. 45-Degree Contact Angle Optimization

The precisely ground grooves on both sides of the rail utilize a 45-degree angle design. This is specifically optimized to pair with the four rows of ball bearings in the LSH series blocks, enabling simultaneous bearing of radial, reverse-radial, and lateral loads.

5. Recommended Application Scenarios (Applications)

The LSH25R rail serves as the "backbone" for the following equipment:

• Heavy-Duty Machine Tools: X/Y axis base for CNC machining centers.

• Long-Stroke Gantry Robots: Overhead transport rails exceeding 2 meters in length.

• Linear Module Base: Guide rails mounted on aluminum profiles or steel plates.

• Old Equipment Refurbishment: When the original rail surface has pitting or rust causing the block to bind, replacing only the rail (LSH25R) is an economical maintenance solution.

6. Compatible Blocks (Recommended)

This rail must be used with the following AirTAC blocks:

• LSH25BK: Square standard block (most common).

• LSH25F1N: Flange wide-body block (suitable for high moments).

• LSH25E: Extended block (suitable for heavy loads).

  • (Note: Although dimensions are similar, mixing with blocks from different brands [e.g., HIWIN] is strictly prohibited unless for emergency use and after testing, as it severely affects service life.)

7. Ordering & Installation Tips (Ordering & Installation Tip)

• Determine Length: Please specify the exact length in millimeters (mm) when ordering. Example: LSH25R-1500L (1500mm long).

• Focus on End Distance (E value): If multiple rails are to be joined or if specific mounting hole positions are required, you must specify the "end distance." (E.g., 20mm space left at both ends).

• Anti-Rust Care: Rails are coated with anti-rust oil upon shipment. Do not completely wipe this off with strong solvents during installation. Apply grease immediately after installation, especially where the rail has been handled, to prevent rust caused by hand perspiration.

• Bolt Tightening: It is recommended to use a torque wrench, following the specified torque in the manual, tightening the bolts alternately from the middle of the rail towards both ends to ensure straightness.