DLY Roller Linear Guide Rail is supplied as a rail-and-block assembly for equipment that requires stable guided motion under load. This page focuses on the RDH-CA and RDH-HA square block configuration shown in the product parameter drawing, including rail size, block length, mounting dimensions, load rating and order confirmation details.
The assembly can be supplied with one rail and one or more matched blocks according to the machine layout. For replacement or new machine assembly, rail length, block quantity, accuracy grade, preload and mounting hole arrangement should be confirmed before production.
Product Focus: RDH-CA and RDH-HA Roller Guide Assembly
The RDH-CA and RDH-HA configurations use a square roller guide block mounted on a precision guide rail. The CA type is a standard-length square block, while the HA type uses a longer block body for applications that need more contact length and stronger load support.
This structure is often selected when the machine design requires a compact square mounting surface, stable running accuracy and a rail system that can carry load from different working directions. The final selection should be based on rail size, block length, installation space and calculated load condition.
| Configuration | Block Form | Main Difference | Typical Selection Situation |
|---|---|---|---|
| RDH-CA | Square standard block | Shorter block body and compact installation length. | Suitable when the machine has limited block space and moderate travel load. |
| RDH-HA | Square long block | Longer block body with higher rated load and moment capacity. | Suitable when higher load, longer support length or stronger moment resistance is needed. |
Model Range and Basic Selection
The RDH-CA and RDH-HA roller guide assemblies are available in multiple rail sizes. Smaller sizes are used for compact precision mechanisms, while larger sizes are selected for machine structures with heavier load and longer span.
| Size Range | Available Examples | Selection Focus | Common Order Form |
|---|---|---|---|
| Small size | RDH15CA, RDH20CA, RDH20HA | Compact structure, lighter machine axis and limited mounting space. | Short rail with one or two blocks. |
| Medium size | RDH25CA, RDH25HA, RDH30CA, RDH30HA | Balanced load capacity, installation size and running stability. | Standard rail length or customized rail cutting. |
| Large size | RDH35CA, RDH35HA, RDH45CA, RDH45HA | Higher load, stronger moment support and more rigid machine slides. | Matched rail-and-block assembly for machine tool or heavy equipment use. |
| Heavy size | RDH55CA, RDH55HA, RDH65CA, RDH65HA | Large load, long travel, gantry structure and high-rigidity installation base. | Custom rail length with confirmed packaging and transport method. |
RDH-CA / RDH-HA Dimension Drawing
The RDH-CA / RDH-HA dimension drawing includes assembly height, block width, block length, rail width, mounting bolt specification, basic dynamic load rating, basic static load rating, static rated moment and weight.
How to read this table: the model name confirms the rail size and block length type; the assembly dimensions confirm whether the block fits the machine structure; the rail dimensions confirm rail mounting; the load and moment ratings help engineers compare different sizes before final selection.
For replacement projects, the rail hole pitch, rail total length and distance from rail end to first hole should also be checked against the original guide rail.
Block Details Shown on the Product
The square block is designed with top mounting holes for direct connection to the moving table or machine plate. Black end caps are installed at both ends of the block, and the side lubrication connection allows grease to be supplied without removing the assembly. The exposed internal structure also shows the roller circulation path, making it easier to understand how the block runs along the guide rail during operation.
Side lubrication connector and square block mounting surface.
Top threaded holes for machine table or moving plate installation.
Internal roller arrangement shown for structure reference.
What Should Be Confirmed Before Ordering?
Roller linear guide rail orders are usually confirmed as a complete assembly. Even when the same rail size is selected, the final product may differ in block length, accuracy grade, preload, rail length, block quantity and lubrication direction.
| Order Item | Example |
|---|---|
| Block type | RDH-CA or RDH-HA |
| Rail size | 15, 20, 25, 30, 35, 45, 55 or 65 |
| Rail length | 500mm, 1000mm, 1500mm or custom length |
| Block quantity | 1 block per rail, 2 blocks per rail or more |
| Accuracy and preload | H / P / SP / UP, Z0 / ZA / ZB |
| Lubrication direction | Front, rear or side lubrication connection |
CA Block or HA Block: How to Choose?
The CA and HA block types should not be selected only by price or appearance. The more important factors are load direction, moment load, available installation length and the required support distance of the moving table.
| Selection Situation | Recommended Direction | Reason |
|---|---|---|
| Limited space on the moving plate | CA type | The standard block length is easier to fit into compact structures. |
| Higher moment load or longer overhang | HA type | The longer block body provides better support length. |
| Replacing an existing guide block | Follow original model | Block length and mounting hole position must match the existing design. |
| New machine design | Confirm by load and space | Rail size, block quantity and preload should be selected together. |
Rail Length and Mounting Hole Confirmation
For customized roller linear guide rails, the rail length should be confirmed together with the hole pitch and end distance. A rail with the correct nominal length may still fail to fit if the first-hole and last-hole positions do not match the machine base.
For replacement orders, it is better to provide a drawing, sample photo, rail marking or actual measurement. DLY can check whether the requested length can be cut with a suitable hole layout before production.
Confirm the required overall length according to stroke and machine base space.
Check whether the rail hole spacing matches the original machine base or new design.
Confirm the first-hole and last-hole distance to avoid installation mismatch.
Lubrication and Maintenance Access
The product block shown on this page includes a lubrication connector at the end or side position. Before ordering, the lubrication direction should match the available maintenance space on the machine. If the block is installed close to a cover, wall plate or moving table, the grease nipple position should be confirmed in advance.
Regular lubrication helps maintain smooth movement and reduce wear between the roller circulation system and the guide rail raceway. For dusty, cutting or coolant-exposed environments, sealing and scraper configuration should be checked together with the lubrication plan.
Product Display
DLY can supply roller linear guide rail assemblies in different rail lengths and block combinations. The assembly can be packed as complete guide rail sets for machine installation or replacement.
FAQ
Q: What is the difference between RDH-CA and RDH-HA?
A: RDH-CA is the standard-length square block type. RDH-HA is the long square block type. HA is usually selected when more support length, higher load capacity or stronger moment resistance is required.
Q: Can DLY supply the rail and block as a matched set?
A: Yes. DLY can supply roller linear guide rails with matched blocks according to rail size, block quantity, rail length, accuracy grade and preload requirement.
Q: Can the rail length be customized?
A: Yes. Rail length can be cut according to customer requirements. For custom length, the mounting hole pitch and end distance should be confirmed before production.
Q: What information is needed for quotation?
A: Please provide the required model, rail length, block quantity, accuracy grade, preload, lubrication direction, application and order quantity. A drawing or sample photo is helpful for replacement projects.
Q: Can one rail be used with multiple blocks?
A: Yes. One rail can be assembled with one, two or more blocks depending on the moving table structure and load distribution. The block quantity should be confirmed together with rail length and installation space.
Contact DLY for Roller Linear Guide Rail Assembly
Send your required rail size, RDH-CA or RDH-HA block type, rail length, block quantity, preload and accuracy grade. DLY can help confirm the suitable roller linear guide rail assembly for your machine.
Hot Tags: roller linear guide rail, China roller linear guide rail manufacturers, suppliers, factory, linear guide carriages and slides, vertical linear guide, star linear guide, linear guide rail and carriage, linear slide rail guide, skate wheel linear guide
