Square Linear Guide Block

Square Linear Guide Block

Square Linear Guide Block for Compact-Width and High-Rigidity Motion Systems

DLY square linear guide blocks are H-type linear guide carriage blocks designed for machines that require compact block width, high rigidity and stable load support. Compared with flange-type guide blocks, square guide blocks have a narrower body structure and are usually mounted from the top, making them suitable for layouts where carriage width, rigidity and positioning stability must be controlled together.

DLY supplies square guide blocks across HDH, EDH and RDH series. HDH is suitable for standard and heavy-duty ball-type guideway systems, EDH is used for low-profile compact structures, and RDH is selected for roller-type high-rigidity applications. Buyers can choose the correct square block according to installation width, load requirement, rigidity demand, accuracy grade and rail width.

Product Features

The main advantage of a square linear guide block is its compact-width carriage body. This structure is useful when the machine design requires a rigid guide block but does not allow a wide flange mounting surface. It is commonly used on vertical axes, narrow machine frames, tooling slides and machine structures where side space is limited.

When matched with the correct linear guide rail, square guide blocks can support radial, reverse-radial and lateral loads. The rigid block body helps resist deformation under load and supports stable movement during repeated acceleration, positioning and machining cycles.

HDH and EDH square guide blocks use steel balls for smooth rolling motion, while RDH square guide blocks use rollers for higher rigidity and heavier load capacity. This allows buyers to select the right square block structure without changing to a flange-type carriage layout.

HDH, EDH and RDH Series Selection

Square guide blocks should be selected by series first, not only by rail width. Although HDH, EDH and RDH blocks all use an H-type square carriage structure, they are designed for different height, load and rigidity requirements.

Product Display

The product photos below present DLY square linear guide blocks with compact-width bodies and top mounting holes. 

Square linear guide block with compact-width body and top mounting holes.

HDH square guide blocks available in multiple sizes for linear guideway systems.

Internal ball circulation structure for smooth square guide block movement.

Front view of an H-type square guide block with a rigid carriage body.

General Specification Range

HDH Square Guide Block Model Reference

HDH is the standard square-type ball guide block series. CA models are heavy-load type, while HA models are super-heavy-load type for higher moment load and rigidity requirements. The following table gives a quick reference for common HDH square block sizes.

Note: Model dimensions and load ratings should be confirmed together with rail length, preload, accuracy grade and installation direction before quotation.

Dimension Drawing and Specification Reference

The original DLY dimension drawing is retained for model checking. For exact replacement, please provide the old block model, rail width, block dimensions and mounting hole layout.

HDH-CA / HDH-HA Square Guide Block

HDH square guide block dimension drawing and load rating reference.

Square Guide Block vs Flange Guide Block

Square and flange guide blocks should be selected according to installation layout rather than only load capacity. A square block provides a narrower carriage body, while a flange block provides a wider mounting surface for direct plate mounting.

Common Applications

Square linear guide blocks are used where the machine axis requires high rigidity, compact carriage width and stable load support. They are especially suitable for machines where a flange block would take too much side space or where top mounting is preferred.

Why Choose DLY Square Linear Guide Blocks?

Manufacturing and Technical Support

Square guide block selection often depends on more than one dimension. Rail width, block size, preload, accuracy grade, rail length and application load should be checked together before production or replacement.

Linear guide block manufacturing and production support.

Quality control support for linear guide block production and inspection.

Engineering support for model checking, drawing confirmation and replacement matching.

Related Products

For other linear guide block structures, you can also check related DLY product pages.

FAQ About Square Linear Guide Blocks

Need Help Selecting a Square Linear Guide Block?

Send DLY your square guide block series, rail width, rail length, accuracy grade, preload requirement, quantity and application. Our team can help confirm a suitable HDH, EDH or RDH square linear guide block before quotation.