AirTAC LSH25BK-HN-ND-M6 Linear Guide Block | Class D Interchangeable High Assembly Square Block

Model: LSH25BK-HN-ND-M6

1. Executive Summary

The AirTAC LSH25BK-HN-ND-M6 is a high-precision interchangeable slider block from the LSH Heavy Load Linear Guide series. This model is specifically designed for modular assembly and the maintenance/replacement market.

The "ND" combination in the code signifies that this block is equipped with Standard Dust Protection (N). Furthermore, the block has undergone strict groove dimension screening to meet "Class D" tolerance requirements. This ensures that when purchased as a replacement or individual component, it maintains consistent preload and smoothness perfectly matched to existing rails requiring "D" group pairing.

2. Model Code Decoding

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Please pay special attention to the highlighted sections, as these are the core factors for selection:

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

• 25: Size Specification — Nominal size 25mm (Actual rail width is approx. 23mm, conforming to industry standards).

• BK: Block Type — Square Standard/Short Block.

• H: Accuracy Class — Class H (High), meeting the precision positioning needs of automation equipment.

• N: Preload Class — N (Standard Preload/No Preload).

• N: Dust Protection Code — Standard Dust Protection (N). Equipped with high wear-resistant end seals to effectively block dust.

• D: Pairing/Interchange Code — Group D Pairing.

  Technical Core: AirTAC categorizes the dimensional tolerance of blocks and rails into multiple groups (e.g., A, B, C, D, E). Group D represents a specific tolerance range. If your existing rail or engineering drawing specifies Group D, you must select a block with this code. Failure to do so may result in the block being too tight (binding/jamming) or too loose (wobbly).

• M6: Grease Nipple Spec — Standard M6 threaded oil nipple connector.

3. Key Features

A. Precise Interchangeability (ND)

The LSH25BK-HN-ND offers specific matching capabilities. In maintenance scenarios, blindly replacing blocks often leads to a drop in precision. Selecting the designated "D" group block maximizes the restoration of the equipment's original factory rigidity settings, making it the "peace of mind" choice for maintenance engineers.

B. Standard Square Design

Adopts a compact square body design (BK Type) without flange wings. This provides a significant advantage in equipment with limited lateral space (such as side-by-side manipulators or XYZ axis modules) while maintaining the overall rigidity required for heavy loads.

C. 4-Direction Equal Load & Self-Alignment

Continuing the LSH series' classic DF (face-to-face) 45-degree contact angle design, this block features self-alignment capabilities in all four directions (up, down, left, right). It effectively absorbs assembly errors from the mounting surface.

4. Technical Specifications

5. Target Applications

The LSH25BK-HN-ND-M6 is particularly suitable for the following "Aftermarket" or "Precision Matching" scenarios:

• Targeted Equipment Maintenance: Used to replace damaged original AirTAC "Group D" blocks to quickly restore production.

• High-Precision Module Assembly: In multi-axis manipulators, using blocks from the same pairing group (Group D) ensures consistent running resistance across multiple guideways.