Linear Guide Roller Bearing Sliding Rail is a roller-type linear motion component used to achieve stable linear movement while carrying load. It is mainly matched with RD series slider blocks and is suitable for automation equipment, packaging machinery, woodworking machinery, CNC systems and other mechanical structures requiring guided linear motion.
This product is supplied as a rail, slider block, or matched rail-and-slider assembly according to the required model, precision grade, preload level, lubrication method and dust-proof configuration.
Product Introduction
The linear guide roller bearing sliding rail is designed to work with RD series slider blocks. The rail provides the guiding raceway, while the slider carries the moving load and runs along the rail. When the rail and slider are properly matched, the system can provide smooth motion, good rigidity and reliable positioning support for mechanical equipment.
For different installation and maintenance requirements, the RD series linear guide roller bearing sliding rail can be supplied in interchangeable and non-interchangeable types. Both types share the same main specifications and dimensions, but their assembly requirements and combined accuracy are different.
Interchangeable and Non-interchangeable Type
| Type | Feature | Suitable Use |
|---|---|---|
| Interchangeable Type | Slider blocks and rails can be replaced or combined more flexibly. | Maintenance, replacement, inventory preparation and equipment where paired assembly is not strictly required. |
| Non-interchangeable Type | Rail and slider are matched as a set to achieve higher combined accuracy. | Precision machines and applications requiring stricter assembly accuracy. |
The model code of the linear slide rail normally reflects the rail size, slider type, precision grade and preload level. For replacement orders, confirming the complete model code and rail length helps reduce the risk of installation mismatch.
Product Parameters and Mounting Dimensions
The following mounting dimension drawings are used for confirming guide rail size, slider size, fixing bolt specification, load rating, static moment and weight. For customized rail length, the final drawing should be confirmed before production.
Lubrication Method
The RD series slider can be lubricated by grease or lubricating oil. Oil nozzles can be installed at the front or rear end of the slider for manual oil pumping. Side oil holes and top oil holes are reserved on the end cover, allowing lateral or upper oiling when required by the machine structure.
Lateral oiling is generally recommended on the non-datum side. If the machine requires side oiling on the datum side or top oiling, the oiling position should be confirmed before production. For automatic grease or oil supply, the pipe connector can be selected according to the lubrication pipe type.
Suitable for common manual lubrication and many machine applications.
Lubricating oil with viscosity of about 30–150 cSt can be used when oil lubrication is required.
Grease should be checked every 100 km of operation, or every 3 to 6 months.
O-Ring Specifications and Maximum Perforation Depth
When an oil nozzle hole is prepared, the O-ring size and maximum allowable perforation depth must match the RD rail size. Incorrect perforation depth may affect oil supply and sealing reliability.
| Specification | Maximum Allowable Depth Tmax |
|---|---|
| RD15 | 3.45 mm |
| RD20 | 4 mm |
| RD25 | 5.8 mm |
| RD30 | 6.2 mm |
| RD35 | 8.65 mm |
| RD45 | 9.5 mm |
| RD55 | 11.6 mm |
| RD65 | 14.5 mm |
Single Slider Grease Quantity
| Specification | Medium Load Grease Quantity | Heavy Load Grease Quantity | Specification | Medium Load Grease Quantity | Heavy Load Grease Quantity |
|---|---|---|---|---|---|
| RD15 | 3 cm³ | - | RD35 | 12 cm³ | 14 cm³ |
| RD20 | 5 cm³ | 6 cm³ | RD45 | 19 cm³ | 23 cm³ |
| RD25 | 7 cm³ | 8 cm³ | RD55 | 28 cm³ | 35 cm³ |
| RD30 | 9 cm³ | 10 cm³ | RD65 | 52 cm³ | 63 cm³ |
Oil Supply Rate
| Specification | Oil Supply Rate | Specification | Oil Supply Rate |
|---|---|---|---|
| RD15 | 0.14 cm³/hr | RD35 | 0.23 cm³/hr |
| RD20 | 0.14 cm³/hr | RD45 | 0.3 cm³/hr |
| RD25 | 0.167 cm³/hr | RD55 | 0.367 cm³/hr |
| RD30 | 0.2 cm³/hr | RD65 | 0.433 cm³/hr |
Walking Parallelism Accuracy
Walking parallelism is related to the rail length and selected accuracy class. The following values are used as an accuracy reference when confirming RD series linear guide roller bearing sliding rail orders.
| Rail Length | H | P | SP | UP |
|---|---|---|---|---|
| ≤100 mm | 7 μm | 3 μm | 2 μm | 2 μm |
| 100–200 mm | 9 μm | 4 μm | 2 μm | 2 μm |
| 200–300 mm | 10 μm | 5 μm | 3 μm | 2 μm |
| 300–500 mm | 12 μm | 6 μm | 3 μm | 2 μm |
| 500–700 mm | 13 μm | 7 μm | 4 μm | 2 μm |
| 700–900 mm | 15 μm | 8 μm | 5 μm | 3 μm |
| 900–1,100 mm | 16 μm | 9 μm | 6 μm | 3 μm |
| 1,100–1,500 mm | 18 μm | 11 μm | 7 μm | 4 μm |
| 1,500–1,900 mm | 20 μm | 13 μm | 8 μm | 4 μm |
| 1,900–2,500 mm | 22 μm | 15 μm | 10 μm | 5 μm |
| 2,500–3,100 mm | 25 μm | 18 μm | 11 μm | 6 μm |
| 3,100–3,600 mm | 27 μm | 20 μm | 14 μm | 7 μm |
| 3,600–4,000 mm | 28 μm | 21 μm | 15 μm | 7 μm |
Dust-proof Equipping Instructions
Dust-proof accessories are important for RD series roller guide rails used in cutting, machining or dusty environments. Scraper blades, bottom dust-proof blades, double-layer oil scrapers, metal scrapers and bolt covers help prevent chips, dust or foreign matter from entering the slider and damaging the raceway surface.
Used to reduce iron particles, dust and small foreign matter entering the slider.
Provides stronger scraping effect for heavy cutting environments.
Helps isolate high-temperature iron filings, machining sparks and larger impurities.
Oil Scraper Blade Thickness
| Specification | Thickness t1 | Specification | Thickness t1 |
|---|---|---|---|
| RD15 ES | 2.2 mm | RD35 ES | 2.5 mm |
| RD20 ES | 2.2 mm | RD45 ES | 3.6 mm |
| RD25 ES | 2.2 mm | RD55 ES | 3.6 mm |
| RD30 ES | 2.4 mm | RD65 ES | 4.4 mm |
Metal Scraper Thickness
| Specification | Thickness t2 | Specification | Thickness t2 |
|---|---|---|---|
| RD15 SC | 1.0 mm | RD35 SC | 1.5 mm |
| RD20 SC | 1.0 mm | RD45 SC | 1.5 mm |
| RD25 SC | 1.0 mm | RD55 SC | 1.5 mm |
| RD30 SC | 1.5 mm | RD65 SC | 1.5 mm |
Bolt Cover Specification
Bolt covers are installed into the rail mounting holes to prevent cutting powder or foreign matter from entering through the bolt holes and affecting running accuracy.
| Rail Specification | Mounting Screw | Diameter D | Thickness H |
|---|---|---|---|
| RDR15 | M4 | 7.65 mm | 1.1 mm |
| RDR20 | M5 | 9.65 mm | 2.2 mm |
| RDR25 | M6 | 11.15 mm | 2.5 mm |
| RDR30 | M8 | 14.20 mm | 3.3 mm |
| RDR35 | M8 | 14.20 mm | 3.3 mm |
| RDR45 | M12 | 20.25 mm | 4.6 mm |
| RDR55 | M14 | 23.5 mm | 5.5 mm |
| RDR65 | M16 | 26.6 mm | 5.5 mm |
Slider Total Length with Dust-proof Code
| Specification | Standard L | ZZ | DD | KK |
|---|---|---|---|---|
| RD15C | 68 | 70 | 72.4 | 74.4 |
| RD20C | 86 | 88 | 90.4 | 92.4 |
| RD20H | 106 | 108 | 110.4 | 112.4 |
| RD25C | 97.9 | 99.9 | 102.3 | 104.3 |
| RD25H | 114.4 | 116.4 | 118.8 | 120.8 |
| RD30C | 109.8 | 112.8 | 114.6 | 117.6 |
| RD30H | 131.8 | 134.8 | 136.6 | 139.6 |
| RD35C | 124 | 127 | 129 | 132 |
| RD35H | 151.5 | 154.5 | 156.5 | 159.5 |
| RD45C | 153.2 | 156.2 | 160.4 | 163.4 |
| RD45H | 187 | 190 | 194.2 | 197.2 |
| RD55C | 183.7 | 186.7 | 190.9 | 193.9 |
| RD55H | 232 | 235 | 239.2 | 242.2 |
| RD65C | 232 | 235 | 240.8 | 243.8 |
| RD65H | 295 | 298 | 303.8 | 306.8 |
Scraper Blade Resistance
The following value is the maximum resistance of a single oil scraper blade.
| Specification | Scraper Resistance | Specification | Scraper Resistance |
|---|---|---|---|
| RD15 | 1.96 N / 0.2 kgf | RD35 | 3.53 N / 0.36 kgf |
| RD20 | 2.45 N / 0.25 kgf | RD45 | 4.21 N / 0.43 kgf |
| RD25 | 2.74 N / 0.28 kgf | RD55 | 5.09 N / 0.52 kgf |
| RD30 | 3.31 N / 0.31 kgf | RD65 | 6.66 N / 0.68 kgf |
Installation Plane Error
The RD series roller guide structure relies on accurate contact between the rolling elements, rail and slider. If the installation plane error is too large, running resistance may increase and service life may be reduced. The bearing surface accuracy should therefore be controlled before rail installation.
Allowable Maximum Parallelism Error P
| Specification | Light Preload Z0 | Medium Preload ZA | Heavy Preload ZB |
|---|---|---|---|
| RD15 | 5 μm | 3 μm | 3 μm |
| RD20 | 8 μm | 6 μm | 4 μm |
| RD25 | 9 μm | 7 μm | 5 μm |
| RD30 | 11 μm | 8 μm | 6 μm |
| RD35 | 14 μm | 10 μm | 7 μm |
| RD45 | 17 μm | 13 μm | 9 μm |
| RD55 | 21 μm | 14 μm | 11 μm |
| RD65 | 27 μm | 18 μm | 14 μm |
Order Confirmation Information
To confirm a linear guide roller bearing sliding rail, please provide the rail model, slider model, rail length, accuracy grade, preload level, lubrication method, dust-proof code and order quantity. For replacement projects, photos of the existing rail marking and mounting holes are useful.
| Item to Confirm | Example | Why It Matters |
|---|---|---|
| Rail and slider model | RD25, RD35, RD45 or matched slider model | Confirms the rail size and slider compatibility. |
| Rail length and hole position | Custom length according to drawing | Reduces installation mismatch during replacement. |
| Interchangeable or non-interchangeable type | Replacement type or matched assembly type | Determines whether rails and sliders need to be supplied as a matched set. |
| Lubrication and oiling direction | Front, rear, side or top oiling | Ensures the lubrication interface matches the machine structure. |
| Dust-proof option | ES, SC, ZZ, DD, KK or bolt cover | Helps protect the slider and rail in dusty or cutting environments. |
FAQ
Q: Can the RD series rail and slider be ordered separately?
A: Yes. Interchangeable type is suitable when the rail and slider need to be replaced or combined separately. For higher combined accuracy, matched non-interchangeable sets are recommended.
Q: Can the oil nozzle position be customized?
A: The oil nozzle can be arranged at the front or rear end of the slider. Side oiling and top oiling can also be confirmed according to machine structure and lubrication method.
Q: What is the purpose of the bolt cover?
A: The bolt cover prevents cutting powder, chips and foreign matter from entering the rail mounting holes, helping protect running accuracy and slider service life.
Q: Why is installation plane accuracy important for this product?
A: RD series roller guide rails are sensitive to installation plane accuracy. Excessive mounting error can increase friction resistance and reduce service life, especially when medium or heavy preload is selected.
Contact DLY for RD Series Roller Guide Rail Confirmation
Send the rail model, slider model, rail length, preload, precision grade, lubrication requirement and dust-proof code. DLY can help confirm the suitable linear guide roller bearing sliding rail for your equipment.
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