SK Shaft Support Block for Round Linear Shaft Mounting
SK shaft support block is a compact mounting block used to clamp and position round linear shafts in shaft-based linear motion systems. It is commonly used with linear shafts, linear bearings, bearing blocks and sliding units to build simple, economical and easy-to-install guide structures.
DLY supplies SK shaft support blocks from SK8 to SK60 for common metric shaft diameters. The series is suitable for CNC routers, automation frames, 3D printers, packaging equipment, inspection devices, transfer systems and general mechanical assemblies that require stable shaft positioning.
For machine builders and maintenance teams, the key point is not only choosing the correct model number, but also confirming shaft diameter, mounting hole position, clamping method, installation space and whether a plain shaft or supported shaft rail structure is more suitable for the application.
What Is an SK Shaft Support Block?
An SK shaft support block holds a round linear shaft in position through a clamping structure. The shaft passes through the bore of the support block, and the block is fixed to the machine frame, aluminum profile, base plate or custom mounting surface with screws.
This type of support block is often selected when the structure needs to be simple, compact and cost-effective. It is especially useful for short to medium travel systems where the shaft can be supported at both ends and the load is not too high.
In a complete shaft-based motion system, SK support blocks usually work together with linear shafts, LM-UU linear bearings, SCS-UU bearing blocks or other shaft sliding components. Correct alignment during installation is important for smooth motion and longer service life.
Available SK Shaft Support Block Models
The SK model number usually corresponds to the shaft diameter. For example, SK20 is commonly used with a 20mm linear shaft. Before ordering, confirm the shaft diameter, base width, mounting hole distance and available installation space.
| Model | Matched Shaft Diameter | Typical Use | Selection Note |
|---|---|---|---|
| SK8 | 8 mm | Mini equipment, small fixtures | Compact and lightweight structure |
| SK10 | 10 mm | Light linear motion assemblies | Easy to install on small frames |
| SK12 / SK13 | 12–13 mm | Compact automation equipment | Common for small sliding systems |
| SK16 | 16 mm | Light to medium shaft systems | Often used with 16mm linear bearings |
| SK20 | 20 mm | CNC, packaging and automation systems | Popular general-purpose size |
| SK25 / SK30 | 25–30 mm | Larger shaft support structures | Check base width and screw spacing |
| SK35 / SK40 | 35–40 mm | Large automation frames | Suitable for higher rigidity demand |
| SK50 / SK60 | 50–60 mm | Heavy round shaft support applications | Confirm stock, quantity and installation drawing |
SK Shaft Support Block Dimensions
The dimension drawing below shows the main installation sizes of the SK shaft support block series, including shaft bore, base width, mounting hole position, support height, locking bolt, clamping bolt and approximate weight. For replacement or batch assembly, the drawing should be checked together with the machine mounting space.
Product Details That Matter in Selection
Split Clamping Structure
The split clamping structure allows the support block to hold the shaft after the clamping screw is tightened. This design makes shaft installation and replacement more convenient than a completely closed support structure.
Flat Mounting Base
The flat base can be mounted on machine frames, aluminum profiles, steel plates or customized fixtures. During installation, the mounting surface should be clean and flat to help keep the shaft axis stable.
Standard Metric Shaft Matching
SK support blocks cover common metric shaft diameters from small-size guide rods to larger round shaft systems. This helps reduce selection difficulty when matching linear shafts, linear bearings and shaft support components in one assembly.
System Compatibility
DLY can supply SK support blocks together with linear shafts, SCS-UU bearing blocks, LM-UU linear bearings and SBR/TBR supported rail products. This is useful when the project needs multiple shaft-based components from one source.
When to Use SK Support Blocks
SK shaft support blocks are suitable for simple round shaft linear motion structures where the shaft is fixed at the end or mounted on the frame. They are practical for short to medium stroke systems, light-duty mechanisms, compact automation and applications where easy replacement is important.
| Application Condition | SK Support Block Suitability |
|---|---|
| Short to medium travel length | Suitable when shaft deflection is not a major concern. |
| Light or medium load | Suitable for simple shaft-based guide systems. |
| Compact machine frame | Good choice when installation space is limited. |
| Easy maintenance required | The clamping structure makes shaft replacement more convenient. |
| Long stroke or higher rigidity demand | Supported shaft rail may be better than end support only. |
SK Support Block or Supported Shaft Rail?
For simple structures, two SK support blocks can hold a round shaft at both ends. This is economical and easy to assemble. However, when the shaft span becomes long, the shaft may bend under load, especially when the bearing block carries weight in the middle of the stroke.
In this case, a supported shaft rail structure such as SBR or TBR may provide better rigidity because the shaft is supported along its length. The choice should be based on stroke length, load direction, required stiffness, installation space and cost.
| Option | Best For | Main Advantage |
|---|---|---|
| SK Shaft Support Block | Short to medium stroke, compact structures, light-duty systems | Simple installation, lower cost and easy replacement |
| SBR/TBR Supported Shaft Rail | Longer stroke, higher load, better rigidity requirement | Continuous shaft support and reduced deflection |
Installation Notes for SK Shaft Support Blocks
Correct installation is important because shaft misalignment may cause linear bearing noise, uneven sliding, extra friction or premature wear. Before tightening all screws, check whether the shaft, bearing and support blocks are aligned smoothly.
| Installation Check | Why It Matters |
|---|---|
| Confirm shaft diameter and SK model | A wrong bore size will affect clamping stability and assembly accuracy. |
| Clean the mounting surface | Dust, burrs or uneven surfaces may cause shaft misalignment. |
| Align both support blocks before final tightening | Poor alignment may make the bearing slide unevenly along the shaft. |
| Tighten mounting screws evenly | Uneven tightening can shift the support block position. |
| Check bearing movement after assembly | The sliding block should move smoothly without obvious jamming or vibration. |
| Consider full-length support for long shafts | Long shafts may deflect if they are supported only at the ends. |
Common Applications
SK shaft support blocks are used in many machines that require round shaft guidance and simple linear movement. They are especially practical for compact equipment, replacement assemblies and motion systems where standard shaft diameters are used.
CNC Routers and Engraving Machines
Used to fix round shafts in light and medium linear guide structures.
3D Printers and Laser Machines
Suitable for compact shaft-based motion assemblies.
Packaging Equipment
Supports repeated linear movement in simple automation systems.
Inspection and Measuring Devices
Helps position guide shafts for stable small-scale movement.
Automation Frames
Works with aluminum profiles, custom plates and mechanical frames.
Maintenance Replacement
Can be used when existing shaft supports need to be replaced or matched with new shafts.
Build a Complete Round Shaft Linear Motion System
For a complete shaft-based linear motion assembly, SK support blocks are usually selected together with shafts, bearings and bearing blocks. DLY can help match these components according to shaft diameter, stroke length and installation structure.
Linear Shaft
Supported Shaft Rail
Linear Bearing Block
DLY Supply Support for SK Shaft Support Blocks
DLY supplies SK shaft support blocks as part of a complete linear motion product range. For projects that need multiple related parts, SK blocks can be supplied together with linear shafts, linear bearings, supported rails, bearing blocks and other linear motion components.
For repeated purchasing projects, DLY can support mixed model orders, carton packing, model labeling and regular replenishment according to order quantity. For equipment assembly, drawings or part lists can be checked before quotation to reduce model mismatch.
If the application uses long shafts, higher load or strict rigidity requirements, DLY can also help compare SK shaft support blocks with SBR/TBR supported rail options according to the actual machine structure.
FAQ About SK Shaft Support Block
Q: What is an SK shaft support block used for?
A: An SK shaft support block is used to clamp and fix a round linear shaft in a linear motion system. It is commonly used with linear bearings, bearing blocks and shaft-based sliding assemblies.
Q: How do I choose the correct SK support block model?
A: Choose the model according to the shaft diameter first. For example, SK20 is commonly used with a 20mm shaft. Then confirm base width, mounting hole distance, support height and available installation space.
Q: Can SK support blocks be used with linear bearings?
A: Yes. SK support blocks are often used with linear bearings or linear bearing blocks. The support block fixes the shaft, while the bearing moves along the shaft to provide linear motion.
Q: Is SK support block suitable for long stroke linear motion?
A: For short or medium stroke systems, SK support blocks are often suitable. For longer strokes, higher loads or applications sensitive to shaft deflection, supported shaft rails such as SBR or TBR may provide better support.
Q: What should be checked during installation?
A: Check shaft diameter, support block alignment, mounting surface flatness, screw tightening and bearing sliding condition. Poor alignment may cause noise, uneven movement or premature wear.
Q: Can DLY supply SK blocks together with shafts and bearings?
A: Yes. DLY can supply SK shaft support blocks together with linear shafts, linear bearings, SCS-UU bearing blocks and supported shaft rail assemblies according to the required model list.
Q: What information is needed for quotation?
A: Please provide the model, shaft diameter, quantity, matching shaft or bearing requirement, installation drawing if available, and any packaging or labeling requirements. For mixed model orders, a clear list helps speed up quotation.
Contact DLY for SK Shaft Support Block Selection
If you need SK shaft support blocks for round linear shaft systems, DLY can help confirm model selection, shaft diameter matching, quantity, packing method and related linear motion components.
For faster quotation, please send your model list, quantity, shaft diameter, matching bearing or shaft requirement and any installation drawing.
Email: export@dlybearing.com
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