RD Roller Guide Block
RD Roller Guide Block for High-Rigidity Linear Motion Systems
DLY RD roller guide blocks are high-rigidity linear guide carriages designed for heavy-load and high-precision motion systems. Instead of using steel balls, the RD series uses roller-type rolling elements to increase contact stiffness, load capacity and running stability.
RDH square blocks and RDW flange blocks are available for CNC machining centers, heavy-duty cutting machines, CNC grinding machines, injection molding machines, wire cutting machines, large gantry machines and other equipment requiring stronger rigidity in four load directions.
What Makes RD Roller Guide Blocks Different?
The RD series is DLY's roller-type linear guide block series for applications where a standard ball-type guide block may not provide enough rigidity. The roller and raceway form line contact, helping reduce elastic deformation under load and improving resistance to moment load, vibration and heavy cutting force.
With a 45-degree contact angle design, RD roller guide blocks can support load from radial, reverse-radial and lateral directions. This makes them suitable for horizontal, vertical and side-mounted rail installations in high-rigidity equipment.
RDH and RDW Series Selection
DLY RD roller guide blocks are mainly supplied in RDH square type and RDW flange type. Buyers can select heavy-load or super-heavy-load structures according to machine load, mounting space and rigidity requirements.
| Series | Block Structure | Load Type | Mounting Method | Best For |
|---|---|---|---|---|
| RDH-CA | Square roller guide block | Heavy load | Mounting from top | Compact heavy-load axes and high-rigidity machine structures |
| RDH-HA | Square roller guide block | Super heavy load | Mounting from top | Higher moment load, longer service life and stronger rigidity requirements |
| RDW-CC | Flange roller guide block | Heavy load | Mounting from top or bottom | Wider mounting surface, machine plates and equipment bases |
| RDW-HC | Flange roller guide block | Super heavy load | Mounting from top or bottom | Large machine bases, high-load axes and heavy-duty precision equipment |
Product Display
The following product photos show DLY RD roller guide blocks in square and flange structures. For replacement or new equipment assembly, please confirm rail width, block type, load grade, accuracy grade, preload requirement and mounting hole layout before ordering.
RD roller guide blocks for high-rigidity linear motion systems.
RDH square roller guide block for compact high-rigidity mounting.
Roller circulation structure inside an RD roller guide block.
RDW flange roller guide blocks with wider mounting surfaces.
General Specification Range
| Product Type | RD Roller Guide Block / RD Sliding Block / Roller Linear Guide Carriage |
| Available Series | RDH square type, RDW flange type |
| Load Grade | Heavy load and super heavy load |
| Rail Width Range | 15mm, 20mm, 23mm, 28mm, 34mm, 45mm, 53mm, 63mm |
| Overall Height Range | RDH: 28mm to 90mm; RDW: 24mm to 90mm |
| Maximum Rail Length | 4000mm to 6000mm depending on rail width and model |
| Material | S55C guide rail and block body; PA66 recirculator |
| Accuracy Grade | H, P, SP, UP |
| Basic Dynamic Load Rating | 11.3kN to 275.3kN depending on model |
| Basic Static Load Rating | 24kN to 572.7kN depending on model |
| Typical Applications | CNC machining centers, heavy-duty cutting machines, CNC grinding machines, injection molding machines, EDM equipment, wire cutting machines and large gantry machine tools |
RDH Square Roller Guide Block Models
RDH series uses a square block structure with top mounting. CA models are heavy-load type, while HA models are super-heavy-load type for stronger moment load and rigidity requirements.
| Model | Rail Width | Block L×W×H | Overall Height | Dynamic Load C | Static Load C₀ | Max Rail Length |
|---|---|---|---|---|---|---|
| RDH15CA | 15mm | 68×34×24mm | 28mm | 11.3kN | 24kN | 4000mm |
| RDH20CA | 20mm | 86×44×29mm | 34mm | 21.3kN | 46.7kN | 4000mm |
| RDH20HA | 20mm | 106×44×29mm | 34mm | 26.9kN | 63kN | 4000mm |
| RDH25CA | 23mm | 97.9×48×34.5mm | 40mm | 27.7kN | 57.1kN | 6000mm |
| RDH25HA | 23mm | 114.4×48×34.5mm | 40mm | 33.9kN | 73.4kN | 6000mm |
| RDH30CA | 28mm | 109.8×60×39mm | 45mm | 39.1kN | 82.1kN | 6000mm |
| RDH30HA | 28mm | 131.8×60×39mm | 45mm | 48.1kN | 105kN | 6000mm |
| RDH35CA | 34mm | 124×70×48.5mm | 55mm | 57.9kN | 105.2kN | 6000mm |
| RDH35HA | 34mm | 151.5×70×48.5mm | 55mm | 73.1kN | 142kN | 6000mm |
| RDH45CA | 45mm | 153.2×86×62mm | 70mm | 92.6kN | 178.8kN | 6000mm |
| RDH45HA | 45mm | 187×86×62mm | 70mm | 116kN | 230.7kN | 6000mm |
| RDH55CA | 53mm | 183.7×100×70mm | 80mm | 130.5kN | 252kN | 6000mm |
| RDH55HA | 53mm | 232×100×70mm | 80mm | 167.8kN | 348kN | 6000mm |
| RDH65CA | 63mm | 232×126×78mm | 90mm | 213kN | 411.6kN | 6000mm |
| RDH65HA | 63mm | 295×126×78mm | 90mm | 275.3kN | 572.7kN | 6000mm |
RDW Flange Roller Guide Block Models
RDW series uses a flange block structure with a wider mounting surface. CC models are heavy-load type, while HC models are super-heavy-load type. RDW blocks support mounting from top or bottom for more flexible machine design.
| Model | Rail Width | Block L×W×H | Overall Height | Dynamic Load C | Static Load C₀ | Max Rail Length |
|---|---|---|---|---|---|---|
| RDW15CC | 15mm | 68×47×20mm | 24mm | 11.3kN | 24kN | 4000mm |
| RDW20CC | 20mm | 86×63×25mm | 30mm | 21.3kN | 46.7kN | 4000mm |
| RDW20HC | 20mm | 106×63×25mm | 30mm | 26.9kN | 63kN | 4000mm |
| RDW25CA | 23mm | 97.9×70×30.5mm | 36mm | 27.7kN | 57.1kN | 6000mm |
| RDW25HC | 23mm | 114.4×70×30.5mm | 36mm | 33.9kN | 73.4kN | 6000mm |
| RDW30CC | 28mm | 109.8×90×36mm | 42mm | 39.1kN | 82.1kN | 6000mm |
| RDW30HC | 28mm | 131.8×90×36mm | 42mm | 48.1kN | 105kN | 6000mm |
| RDW35CC | 34mm | 124×100×41.5mm | 48mm | 57.9kN | 105.2kN | 6000mm |
| RDW35HC | 34mm | 151.5×100×41.5mm | 48mm | 73.1kN | 142kN | 6000mm |
| RDW45CC | 45mm | 153.2×120×52mm | 60mm | 92.6kN | 178.8kN | 6000mm |
| RDW45HC | 45mm | 187×120×52mm | 60mm | 116kN | 230.9kN | 6000mm |
| RDW55CC | 53mm | 183.7×140×60mm | 70mm | 130.5kN | 252kN | 6000mm |
| RDW55HC | 53mm | 232×140×60mm | 70mm | 167.8kN | 348kN | 6000mm |
| RDW65CC | 63mm | 232×170×78mm | 90mm | 213kN | 411.6kN | 6000mm |
| RDW65HC | 63mm | 295×170×78mm | 90mm | 275.3kN | 572.7kN | 6000mm |
Note: Model dimensions and load ratings should be confirmed together with rail length, accuracy grade, preload and installation direction before quotation.
Dimension Drawing and Model Reference
The drawings and product reference images below are retained for model checking. For exact replacement, please provide the old block model, rail model, rail width and mounting dimensions.
RDH-CA / RDH-HA Square Roller Guide Block
RDH square roller guide block dimension drawing and specification reference.
RDH and RDW Product Model Display
Model display for RDH square blocks and RDW flange blocks in common sizes.
Roller-Type Structure and Running Stability
The RD roller guide block uses a roller circulation system instead of a ball circulation system. This structure increases the contact area between rolling element and raceway, helping improve rigidity and load capacity for machine axes that operate under heavier cutting force or higher moment load.
Roller spacer structure used to support stable roller circulation.
Running resistance reference for evaluating guide block movement stability.
Interchangeable and Non-Interchangeable Types
RD roller guide blocks can be selected as interchangeable or non-interchangeable type according to replacement convenience and combined accuracy requirements.
| Type | Main Advantage | Suitable For |
|---|---|---|
| Interchangeable Type | Rail and block can be matched separately, making replacement and stock management more convenient. | General equipment, maintenance replacement, automation systems and projects without ultra-precision pairing requirements. |
| Non-Interchangeable Type | Rail and block are supplied as a matched set to support higher combined accuracy. | High-end equipment, precision machining axes and machine tools with stricter accuracy requirements. |
Top Locking and Bottom Locking Rail Options
In addition to conventional top-locking bolt-hole rails, RD series can also be matched with bottom-locking rail structures for special machine layouts, inverted installations or equipment where top access is limited.
Bottom locking rail structure for special machine layouts.
Top locking rail structure for standard installation.
Common Applications
RD roller guide blocks are used where the machine axis needs higher rigidity, stronger load capacity and better stability than standard ball-type guide blocks.
| Application | Why RD Roller Guide Block Is Used | Selection Focus |
|---|---|---|
| CNC Machining Centers | Supports high-rigidity axis movement and cutting stability. | Accuracy grade, preload, dynamic load and moment load. |
| Heavy-Duty Cutting Machines | Handles stronger load, vibration and cutting force during heavy machining. | Super-heavy-load block, rail width and rigidity requirement. |
| CNC Grinding Machines | Helps maintain smooth, stable and accurate motion during precision grinding. | Running smoothness, accuracy and installation flatness. |
| Injection Molding Machines | Suitable for repeated heavy-load movement and rigid sliding structures. | Load capacity, lubrication and service life. |
| Large Gantry Machines | Provides stronger support for large-span and long-stroke guide systems. | Rail length, block quantity, moment load and parallel installation. |
| EDM and Wire Cutting Machines | Supports stable motion in precision processing equipment. | Accuracy, smoothness and environmental protection. |
How to Select an RD Roller Guide Block
1. Choose RDH or RDW
RDH is a square block for compact mounting. RDW is a flange block with a wider mounting surface and top or bottom mounting options.
2. Confirm Heavy or Super Heavy Load
Choose CA/CC for heavy load and HA/HC for super heavy load when the axis has higher moment load or stronger rigidity requirements.
3. Check Rail Width and Length
Confirm rail width, total rail length, hole pitch and end distance according to your machine base and stroke requirement.
4. Confirm Accuracy and Preload
H, P, SP and UP accuracy grades can be checked according to positioning accuracy, rigidity and running smoothness requirements.
5. Decide Interchangeable or Matched Set
Interchangeable type is convenient for replacement. Matched rail and block sets are recommended for stricter accuracy requirements.
6. Send Drawing or Old Model
For replacement projects, provide model number, rail width, block type, hole distance, rail length and clear photos for confirmation.
Assembly, Inspection and Product Evidence
RD roller guide blocks require careful assembly of roller circulation parts, preload checking and protection against dust or foreign matter. The retained product evidence image shows RD guide block assembly and inspection work before shipment.
Related Products
For other linear block and linear guideway requirements, you can also check related DLY product pages.
FAQ About RD Roller Guide Blocks
What is the difference between RD roller guide block and ball-type guide block?
RD roller guide blocks use rollers instead of steel balls. The roller structure provides higher rigidity and stronger load capacity, making it suitable for heavy-duty and high-precision equipment.
What is the difference between RDH and RDW blocks?
RDH is a square roller guide block with top mounting. RDW is a flange roller guide block with a wider mounting surface and can support mounting from top or bottom.
When should I choose HA or HC super-heavy-load type?
HA or HC types are recommended when the machine axis has higher load, stronger moment load, heavy cutting force or more demanding rigidity requirements.
Can RD blocks and rails be supplied separately?
Interchangeable types can be matched more flexibly. For higher combined accuracy, matched rail and block sets are recommended.
What information is needed for quotation?
Please provide model number, rail width, block type, rail length, accuracy grade, preload requirement, quantity and application. Photos or drawings are helpful for replacement projects.
Need Help Selecting an RD Roller Guide Block?
Send DLY your RD block model, rail width, rail length, mounting direction, accuracy grade, preload requirement, quantity and application. Our team can help confirm a suitable RDH or RDW roller guide block before quotation.
Hot Tags: RD Roller Guide Block, China RD Roller Guide Block manufacturers, suppliers, factory, linear bearing slide block, slide block bearing, linear sanding blocks, Mgn12c Block
