The SBR30 linear shaft is a 30 mm supported round rail intended for machine axes with a relatively wide moving platform and sufficient mounting space for a 60 mm rail base. Its function is not limited to providing a larger shaft diameter: the continuous lower support transfers forces from the shaft into the machine structure throughout the rail length.
An SBR30 axis can be assembled with one rail for a guided auxiliary mechanism or with two parallel rails beneath a moving plate. SBR30UU open-type bearing blocks travel along the exposed shaft surface while clearing the support underneath it. The rail, bearing blocks and moving platform therefore need to be considered as one mechanical arrangement.
DLY supplies the SBR30 rail separately or together with matched blocks. Other supported and unsupported shaft configurations are available in the linear shaft category.
Axis Configuration
SBR30 is normally selected as part of a complete moving platform rather than as an isolated shaft. The arrangement depends on the width of the platform, the location of the working load and the resistance required against pitching, rolling and yawing moments.
Suitable for guided auxiliary movement where the surrounding mechanism controls rotation and overturning.
Common for machine tables and transfer plates that require support on both sides of the moving platform.
Two blocks per rail increase the longitudinal support spacing and improve resistance to an offset working load.
A larger shaft diameter does not automatically define the capacity of the finished axis. Rail spacing, distance between blocks, moving-plate stiffness, load direction, acceleration and machine-base deformation can have a greater effect on platform behavior than shaft diameter alone.
Rail Geometry
| Shaft diameter d | 30 mm |
| Drawing dimension E | 30 mm |
| Overall height h | 37 mm |
| Base width B | 60 mm |
| Shaft center height H | 22.8 mm |
| Base thickness T | 7 mm |
| Dimension F | 26.5 mm |
| Dimension X | 10.3 mm |
| Side height Y | 13 mm |
| Support-body width C | 40 mm |
| Support angle θ | 60°/50° |
| Rail weight | 7.38 kg/m |
| S1 | a1 | a2 | Mounting Hole d1 | End Distance N | Hole Pitch P |
|---|---|---|---|---|---|
| Ø6.6 mm | 8.5 mm | 14 mm | 9 mm | 25 mm | 200 mm |
Length Pattern
SB30 standard lengths are 450, 850, 1250 and 1450 mm. These lengths use a 25 mm nominal distance from each rail end to the first or last mounting-hole center, together with a 200 mm pitch between adjacent holes.
| Standard Rail Length | End Distance N | Hole Pitch P | Maximum Single Length |
|---|---|---|---|
| 450 / 850 / 1250 / 1450 mm | 25 mm | 200 mm | 6000 mm |
A custom length does not always produce the same end distance as a standard rail. When the specified length cannot follow the standard relationship, the final hole pattern should be defined on the approved drawing. Lengths above 6000 mm can be divided into joined sections after the joint position and mounting reference have been established.
SBR30UU Matching
The supported area underneath an SBR30 shaft prevents a closed linear bearing from passing along the rail. The matching carriage therefore uses an open-type bearing structure. The standard matched model is SBR30UU.
| Matched Component | Bearing Designation | Dynamic Rating C | Static Rating C₀ | Block Weight |
|---|---|---|---|---|
| SBR30UU bearing block | LM30UU-OP | 1570 N | 2740 N | 630 g |
Platform Design
The 60 mm rail-base width must be included when determining the machine-frame width and the distance between two parallel rails. Enough clearance is also required around each SBR30UU housing so that the moving plate can be mounted without contacting the rail support.
| Rail spacing | Wider rail spacing generally improves resistance to rolling moments but increases machine-frame width. |
| Block spacing | Increasing the distance between two blocks on one rail improves support against pitching moments and offset loads. |
| Base surface | The support rail follows the machine mounting surface; local unevenness can affect parallelism and carriage movement. |
| Moving plate | The plate must be stiff enough to connect the blocks without forcing two parallel rails out of alignment. |
Material and Use
SBR30 shafts are available in bearing steel and high-carbon steel. If a project requires a defined hardness, hardened-layer depth, surface treatment, diameter tolerance or straightness value, these requirements should be stated separately instead of being assumed from the material name.
The SBR30 format is suitable for woodworking machinery, cutting and engraving equipment, material-transfer platforms, packaging mechanisms and general automation where a supported 30 mm round-shaft system can be accommodated. For high moment loads, high positioning accuracy or very compact mounting height, a profile linear guide may be more appropriate and should be evaluated separately.
FAQ
Q: 1. Is SBR30 normally used as one rail or as a pair?
A: A single SBR30 rail can guide an auxiliary mechanism when rotation is controlled by the surrounding structure. Machine tables and wider moving platforms normally use two parallel rails, often with two SBR30UU blocks on each rail.
Q: 2. How should the rail spacing and block spacing be determined?
A: Rail spacing is selected according to the width of the moving platform and the required resistance to rolling moments. The distance between two blocks on the same rail affects resistance to pitching moments. Both dimensions should be evaluated together with the position of the working load.
Q: 3. Do the SBR30UU load ratings represent the capacity of the complete axis?
A: No. The dynamic and static ratings apply to one SBR30UU bearing block. The capacity of the assembled axis also depends on block quantity, rail spacing, block spacing, load direction, acceleration, mounting accuracy and machine-frame stiffness.
Q: 4. How are the mounting holes arranged on an SBR30 rail?
A: The standard SB30 arrangement uses a 200 mm mounting-hole pitch and a nominal end distance of 25 mm. Standard rail lengths include 450, 850, 1250 and 1450 mm. A custom length may require a revised end distance or hole layout.
Q: 5. What mounting surface is required for SBR30?
A: The machine base should provide continuous support beneath the 60 mm-wide rail base. Unevenness, contamination or distortion of the mounting surface can affect rail parallelism and cause uneven carriage movement, especially when two rails are installed together.
Q: 6. When should a profile linear guide be considered instead of SBR30?
A: A profile linear guide may be more suitable when the machine requires high moment capacity, compact assembly height, tightly controlled positioning accuracy or high rigidity within limited installation space. SBR30 is more appropriate when a supported round-shaft structure matches the machine layout and performance requirements.
Q: 7. Can an SBR30 rail longer than 6000 mm be supplied?
A: The maximum single-piece length is 6000 mm. Longer travel can be achieved with joined rail sections, but the joint position, mounting reference and carriage passage should be reviewed from the machine drawing before production.
Supply Scope
DLY can supply SBR30 as an individual rail, a matched pair of rails, separate SBR30UU blocks or a rail-and-block set. Standard lengths and drawing-based custom lengths are available, with a minimum order quantity of one piece and a one-year warranty.
For SBR30 rail length, hole-pattern or block-quantity confirmation, send the moving-platform dimensions and installation drawing for technical review.
Contact UsHot Tags: sbr30 linear shaft, China sbr30 linear shaft manufacturers, suppliers, factory, 30mm linear shaft, 16mm Linear Shaft, linear guide motor, round shaft linear bearings, linear guide bearing block, 20mm Linear Rod
