Shaft Collar Selection Guide – Clamp-Style vs Set Screw for Precision Positioning
Shaft collars (also known as locking rings, positioning rings, or axle collars) are essential components in power transmission systems – used to position, locate, and retain components such as timing pulleys, bearings, gears, sprockets, and spacers on shafts. They serve as mechanical stops, locating components, and bearing faces.
This guide compares two common shaft collar designs – clamp-style (one-piece) and set screw – and helps you select the right collar for your application.
1. Shaft Collar Designs – Overview
| Feature | Clamp-Style (DNV) | Set Screw |
|---|---|---|
| Holding force | Uniform 360° clamping | Point-contact (set screw tip) |
| Shaft damage | None – non-marring | Yes – marring, scoring |
| Repositioning | Easy – no shaft damage | Difficult – shaft damage impairs adjustment |
| Vibration resistance | Excellent – uniform force | Moderate – can loosen |
| Installation | Simple screw tightening | Simple screw tightening |
| Torque capacity | Higher – uniform friction | Lower – point contact |
| Best for | Precision positioning, automation, servo systems | Simple, low-load applications |
2. Why Choose Clamp-Style (DNV) Shaft Collars?
Reason 1: No Shaft Damage
Clamp-style collars distribute clamping force evenly around the entire shaft circumference, preventing marring, scoring, or other damage. This allows for easy repositioning and adjustment. Set screw collars create point-contact stress that can damage shafts and make repositioning difficult.
Reason 2: Higher Holding Power
The uniform clamping force of a one-piece collar provides very high retaining forces – superior to set screw designs. The clamp-style collar surrounds the shaft with a uniformly distributed clamping force, ensuring a dimensionally precise fit.
Reason 3: Vibration Resistance
The 360° clamping force resists loosening from vibration – ideal for high-speed and dynamic applications.
Reason 4: Easy Installation & Removal
Simply tighten or loosen the clamping screw – no special tools required.
Reason 5: Non-Marring
Clamp-style collars are ideal for applications where shaft surface integrity is critical – such as precision automation, servo systems, and packaging machinery.
3. Common Applications for Clamp-Style Collars
| Application | How Shaft Collars Are Used |
|---|---|
| Timing Pulley Positioning | Secures pulleys in precise axial positions on conveyor and automation shafts |
| Bearing Retention | Locks bearings in place on shafts inside gearboxes and speed reducers |
| Axial Stops | Serves as mechanical stops for shaft-mounted components |
| Gear & Sprocket Positioning | Positions gears and sprockets accurately on drive shafts |
| Servo Systems | Positions components in high-precision servo drive systems |
| Packaging Machinery | Locates rollers, pulleys, and guides in packaging equipment |
4. Material Selection – Aluminum vs Steel
| Material | Advantages | Best For |
|---|---|---|
| Aluminum (DNV) | Lightweight, corrosion-resistant, low inertia, anodized finish | High-speed automation, servo systems, packaging machinery |
| Steel | Higher strength, higher torque capacity | Heavy-duty, high-load applications |
| Stainless Steel | Corrosion-resistant, hygienic | Food processing, medical, marine |
✅ The DNV aluminum collar offers the best combination of lightweight construction, corrosion resistance, and precision for automation and servo applications.
5. Installation Tips
Clean the shaft – Remove oil, grease, and debris before installation
Slide the collar onto the shaft – Position it at the desired location
Tighten the clamping screw – Use a torque wrench to specification
Check positioning – Verify the collar is holding the component securely
Adjust as needed – Loosen, reposition, and retighten – no shaft damage
6. Selection Checklist
Type: Clamp-style (DNV) for non-marring, high-holding-power applications
Material: Aluminum for lightweight, corrosion-resistant applications
Bore size: Match your shaft diameter – 30mm standard, custom available
Application: Timing pulley positioning, bearing retention, axial stops
Environment: Temperature range -40°C to +175°C
Customization: OEM/ODM/OBM available
7. Conclusion
The DNV aluminum clamping shaft collar from Apex Coupling offers the perfect combination of secure holding power, non-marring shaft engagement, and lightweight construction for precision positioning applications. With its one-piece clamp design, anodized aluminum construction, and easy installation, it is the ideal solution for timing pulley positioning, bearing retention, and axial stops in automation, servo systems, and packaging machinery.
👉 Need a shaft collar for your precision application? Contact us with your bore size and requirements.
Inquiry now:
ella@apexcoupling.com
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