A 20mm linear guide rail is a compact and rigid linear motion component used when machines need stable travel, accurate positioning, and smooth sliding under medium to heavy loads. Compared with small miniature rails, a 20mm rail provides better rigidity and load capacity while still keeping the installation size manageable for CNC equipment, automation machines, inspection systems, packaging equipment, and precision motion platforms.
DLY supplies 20mm linear guide rail systems in multiple structures, including HD series heavy-load guideways, ED series low-profile guideways, and RD series roller guideways. Customers can select square blocks, flange blocks, top mounting, bottom mounting, preload, accuracy grade, and rail length according to the actual machine structure.
Product Overview
The 20mm size is one of the most commonly used specifications in industrial linear guide systems. It is suitable for applications where a machine needs stronger support than miniature guide rails but does not require the larger installation space of 25mm, 30mm, or 35mm guideways.
For buyers replacing existing guideways or designing new equipment, the key selection points are usually rail width, block type, load direction, mounting hole pattern, overall height, accuracy grade, preload, and rail length. DLY can support standard models as well as customized rail cutting, matched blocks, packaging, and OEM supply.
20mm Rail Profile
Standard 20mm rail width for compact yet rigid linear motion structures.
Multiple Block Options
Square and flange blocks are available for different installation spaces and load directions.
Rail Length up to 4000mm
Rails can be supplied in standard or cut lengths according to machine stroke requirements.
Matched Rail and Block
Rail and carriage matching helps improve smoothness, rigidity, and assembly reliability.
20mm Linear Guide Rail Parameter Table
The following table keeps the original model and technical parameter content. For mobile viewing, slide the table horizontally to check all 20mm rail and block options.
| Model No. | HDW 20CA |
HDW 20HA |
HDW 20CB |
HDW 20HB |
HDH 20CA |
HDH 20HA |
EDW 20SA |
EDW 20CA |
EDW 20SB |
EDW 20CB |
EDH 20SA |
EDH 20CA |
RDH 20CA |
RDH 20HA |
RDW 20CC |
RDW 20HC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Product Category | HD series W: Flange Type C: Heavy Load A: Mounting From Top |
HD series W: Flange Type H: Super Heavy Load A: Mounting From Top |
HD series W: Flange Type C: Heavy Load B: Mounting From Bottom |
HD series W: Flange Type H: Super Heavy Load B: Mounting From Bottom |
HD series H: Square Type C: Heavy Load A: Mounting From Top |
HD series H: Square Type H: Super Heavy Load A: Mounting From Top |
ED series W: Flange Type S: Medium Load A: Mounting From Top |
ED series W: Flange Type C: Heavy Load A: Mounting From Top |
ED series W: Flange Type S: Medium Load B: Mounting From Bottom |
ED series W: Flange Type C: Heavy Load B: Mounting From Bottom |
ED series H: Square Type S: Medium Load A: Mounting From Top |
ED series H: Square Type C: Heavy Load A: Mounting From Top |
RD series H: Square Type C: Heavy Load A: Mounting From Top |
RD series H: Square Type H: Super Heavy Load A: Mounting From Top |
RD series W: Flange Type C: Heavy Load C: Mounting From Top or Bottom |
RD series W: Flange Type H: Super Heavy Load C: Mounting From Top or Bottom |
| Rail Width (mm) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Rail Height (mm) | 17.5 | 17.5 | 17.5 | 17.5 | 17.5 | 17.5 | 15.5 | 15.5 | 15.5 | 15.5 | 15.5 | 15.5 | 21 | 21 | 21 | 21 |
| Maximum rail length (mm) | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 | 4000 |
| Pitch (P) (mm) | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 30 | 30 | 30 | 30 |
| Distance to End (Es) (mm) | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Material | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C | S55C |
| Block Length*Width*Height (mm) | 77.5 * 63 * 25.4 | 77.5 * 63 * 25.4 | 77.5 * 63 * 25.4 | 77.5 * 63 * 25.4 | 77.5 * 44 * 25.4 | 92.2 * 44 * 25.4 | 50*59*22 | 69.1 * 59 * 22 | 50*59*22 | 69.1 * 59 * 22 | 50*42*22 | 69.1 * 42 * 22 | 86 * 44 * 29 | 106*44*29 | 86 * 63 * 25 | 106 * 63 * 25 |
| Overall Height (mm) | 30 | 30 | 30 | 30 | 30 | 30 | 28 | 28 | 28 | 28 | 28 | 28 | 34 | 34 | 30 | 30 |
| Bearing Steel Ball Diameter (mm) | 3.969 | 3.969 | 3.969 | 3.969 | 3.969 | 3.969 | 3.175 | 3.175 | 3.175 | 3.175 | 3.175 | 3.175 | ||||
| Ball Recirculator Material | PA6 | PA6 | PA6 | PA6 | PA6 | PA6 | PA6 | PA6 | PA6 | PA6 | PA6 | PA6 | PA66 | PA66 | PA66 | PA66 |
| Basic dynamic load rating C(kN) | 17.35 | 21.18 | 17.35 | 21.18 | 17.35 | 21.18 | 7.23 | 10.31 | 7.23 | 10.31 | 7.23 | 10.31 | 21.3 | 26.9 | 21.3 | 26.9 |
| Basic Static Load Rating C₀(kN) | 37.84 | 48.84 | 37.84 | 48.84 | 37.84 | 48.84 | 12.74 | 21.16 | 12.74 | 21.16 | 12.74 | 21.16 | 46.7 | 63 | 46.7 | 63 |
| Rail Net Weight (kg) | 2.21kg/m | 2.21kg/m | 2.21kg/m | 2.21kg/m | 2.21kg/m | 2.21kg/m | 2.08kg/m | 2.08kg/m | 2.08kg/m | 2.08kg/m | 2.08kg/m | 2.08kg/m | 2.76kg/m | 2.76kg/m | 2.76kg/m | 2.76kg/m |
| Block Net Weight (kg) | 0.4 | 0.52 | 0.4 | 0.52 | 0.3 | 0.39 | 0.19 | 0.32 | 0.19 | 0.32 | 0.15 | 0.24 | 0.4 | 0.53 | 0.47 | 0.63 |
| Accuracy | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | C, H, P, SP, UP | H, P, SP, UP | H, P, SP, UP | H, P, SP, UP | H, P, SP, UP |
How to Choose the Right 20mm Linear Guide Rail
A 20mm rail can be used in different machine structures, but the correct model depends on load, installation space, block shape, and the direction of force. Instead of selecting only by rail width, buyers should check the complete rail-and-block combination.
For replacement projects, confirm the rail width, rail height, mounting pitch, end distance, block height, block length, and screw hole direction before placing an order. This helps avoid installation mismatch after the guide rail arrives.
HD Series: Heavy-Load 20mm Linear Guide Rail
The HD series is suitable for machines that require stronger rigidity and stable running performance. HDH20 square blocks are often used where the carriage is mounted from the top, while HDW20 flange blocks are useful when the machine base or moving plate needs a wider mounting surface. For CNC tables, automation axes, and equipment with higher moment loads, HD series is usually the first option.
ED Series: Low-Profile 20mm Linear Guide Rail
The ED series is designed for applications where installation height is limited. Compared with the HD series, it offers a lower overall structure while still maintaining smooth movement. It is suitable for compact automation equipment, light-duty machinery, measuring devices, and space-sensitive linear motion assemblies.
RD Series: Roller Type 20mm Linear Guide Rail
The RD series is used when the machine requires higher rigidity and better resistance to heavy load or moment load. Roller guideways are suitable for applications such as machine tools, heavy-duty positioning stages, high-rigidity axes, and equipment where vibration resistance and load stability are important.
Key Features of DLY 20mm Linear Guide Rail
Smooth Linear Motion
The rail and block work together to provide stable sliding motion with low friction, helping the machine axis move smoothly during repeated operation.
High Rigidity Structure
The 20mm guide rail size offers a balanced structure for compact machines that still require reliable support and positioning stability.
Flexible Block Selection
HDH, HDW, EDH, EDW, RDH, and RDW options allow the guide rail to match different mounting plates, load levels, and machine layouts.
Custom Rail Length
Rail length can be supplied according to project requirements, helping buyers reduce secondary cutting and improve assembly efficiency.
Typical Applications
A 20mm linear guide rail is widely used in equipment that requires controlled linear motion, stable support, and repeatable positioning. Common applications include:
- CNC routers, engraving machines, and small machining equipment
- Automation production lines and pick-and-place systems
- Packaging machines, printing machines, and inspection equipment
- Laser cutting, measuring, and positioning platforms
- Machine tool auxiliary axes and high-rigidity motion stages
Customization Services
DLY can provide customization support for different installation and purchasing requirements. For OEM buyers, machine builders, and maintenance projects, customization can reduce assembly work and improve product matching.
- Rail cutting: customized rail length according to machine stroke and installation space.
- Matched blocks: rail and carriage can be supplied together for easier installation.
- Accuracy selection: different accuracy grades are available for standard machinery and precision motion equipment.
- Preload options: preload can be selected according to rigidity, load, and smoothness requirements.
- OEM support: packaging, label, model marking, and batch supply can be arranged according to customer needs.
Quality Control and Supply Support
For linear guide rail products, stable quality depends not only on the rail body but also on the matching of the rail, block, rolling elements, end caps, seals, and lubrication condition. DLY focuses on dimensional consistency, smooth running, surface treatment, and packing protection before shipment.
Before choosing a 20mm linear guide rail, customers can provide drawings, existing model numbers, required rail length, number of blocks per rail, accuracy grade, and application environment. DLY can help confirm a suitable model from HD, ED, or RD series according to the actual machine requirement.
FAQ
Q: What information should I provide when ordering a 20mm linear guide rail?
A: Please provide the rail model, rail length, block model, number of blocks, accuracy grade, preload requirement, and whether the block is square type or flange type. Drawings or photos of the existing guideway are also helpful for replacement projects.
Q: What is the difference between HD, ED, and RD 20mm guide rails?
A: HD series is suitable for heavy-load and general high-rigidity applications. ED series is used when the installation height needs to be lower. RD series is a roller type guideway for higher rigidity and stronger load performance.
Q: Can the 20mm linear guide rail be cut to a custom length?
A: Yes. Rail lengths can be supplied according to the required machine stroke, within the maximum rail length shown in the parameter table.
Q: How should I maintain the 20mm linear guide rail?
A: Keep the rail surface clean, avoid contamination from chips or dust, apply suitable grease or oil regularly, and check installation alignment during maintenance. Proper lubrication and installation help extend guideway service life.
Need Help Selecting a 20mm Linear Guide Rail?
Send us your required rail length, block type, quantity, accuracy grade, and application details. DLY can help confirm the suitable 20mm linear guide rail model for your machine.
WhatsApp: +86 166 0578 8856
Email: dlyexport2@dlybearing.com
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