RGH55CA Roller Linear Guide Block for Heavy Duty CNC Machines

RGH55CA is a 55-size high square roller linear guide block designed for heavy-load linear motion systems where rigidity, load capacity, and mounting stability are critical. As the CA type in the RGH55 series, it uses a standard block length with top mounting, making it suitable for machine axes that require strong load support without moving to the longer HA block version.

With a dynamic load rating of 130.5 kN and a static load rating of 252 kN, RGH55CA provides a higher load margin than the 45-size RG standard block. Its static rated moments are MR 8.01 kN·m, MP 5.40 kN·m, and MY 5.40 kN·m, giving the block stronger support when the guideway is exposed to heavier workpieces, cutting force, table weight, or offset loads.

For installation, RGH55CA uses M12 * 18 block mounting threads and should be matched with RGR55 roller guide rails. The matching RGR55 rail uses M14 * 45 mounting bolts, with a 60 mm rail hole pitch and 30 mm standard rail end distance. These details should be checked carefully for replacement projects, especially when the machine base already has a fixed rail hole layout.

Compared with RGH55HA, RGH55CA keeps a shorter block body while still providing heavy-load performance in the 55-size rail platform. It is a practical choice for large CNC machines, heavy-duty milling systems, machine tables, and industrial axes where high rigidity is required but the long HA block is not necessary.

To support accurate model selection, the code of RGH55CA roller linear guide block can be understood as follows:

RG: Roller type linear guideway series
H: Square block type
55: Size 55 series, with standard rail width WR = 53 mm
C: Heavy load block type / standard block configuration
A: Mounting from top

Common option suffixes:

Z0 / ZA / ZB: Light, medium, or heavy preload
H / P: High or precision grade

In practical selection, RGH55CA refers to a 55-size standard square type roller linear guide block for heavy-load and high-rigidity linear motion systems. The model should be matched with the corresponding RGR55 rail, while preload and accuracy grade should be selected according to the actual machine requirement.

• Available Preload: Z0 / ZA / ZB
• Available Accuracy Grade: H / P
• Matched Rail: RGR55 rail
• Rail Mounting Type: Standard mounting from top
• Lubrication: Grease lubrication or oil lubrication can be selected according to machine speed, load, and maintenance method
• Oil Viscosity Reference: Oil lubrication normally uses oil in the range of about 32–150 cSt
• Grease Replenishment Reference: Check grease every 100 km or every 3–6 months, depending on operating conditions
• Dust Protection Options: Standard protection, ZZ, KK, or DD configurations are available according to working environment
• Rail Length: Standard or cut-to-length rail can be supplied according to the required travel length or drawing
• Typical Use Level: Suitable for high-rigidity and heavy-load linear motion systems in larger machine structures

The lubrication, dust protection, preload, and rail length information above follows the RG catalog structure for this series

Photo Reference:

The photos above show the actual RGH55CA standard square roller block, including the top mounting surface, side profile, sealing area, end face, lubrication port, machining finish, and model marking. They help customers check the real product structure instead of relying only on catalog drawings.

For replacement review, the photos should be checked together with the drawing and technical specifications before order confirmation.

• Standard Square Block for Larger 55 Size Axes

The RGH55CA roller linear guide block uses a standard square block structure in the 55-size RG series. It provides a practical balance between load capacity, mounting stability, and block length for larger machine axes.

• Strong Load Capacity in 55 Size

RGH55CA provides a dynamic load rating of 130.5 kN and a static load rating of 252 kN. This gives the block a stronger load margin than smaller RG sizes while keeping a standard CA block body.

• Roller Contact for High Rigidity

RGH55CA uses rollers instead of balls as the rolling elements. The roller line contact helps increase stiffness between the rolling elements and the raceway, reducing elastic deformation under heavier working loads.

• Stable Support Against Moment Loads

With static rated moments of MR 8.01 kN·m, MP 5.40 kN·m, and MY 5.40 kN·m, RGH55CA provides stable support for axes affected by table weight, offset load, cutting force, or directional force changes.

• Top-Mounted Square Block Design

RGH55CA adopts a high square block structure with mounting from the top. The M12 * 18 block mounting thread provides a firm fixing method for machine tables, slide bases, and heavy-duty mechanical assemblies.

• Matched RGR55 Rail System

RGH55CA is designed to work with the corresponding RGR55 roller guide rail, keeping block and rail selection clear for matched assembly supply and cut-to-length rail orders.

• Practical Alternative to the HA Long Block

Compared with RGH55HA, the CA version keeps the block shorter while still providing heavy-load support. It is useful when the machine axis needs high rigidity but does not require the longer bearing contact area of the HA block.