STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm
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STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mmSTS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm

STS S3M 24-80T Timing Belt Pulley With Expansion/Tension Sleeve Teeth Width 16mm

HomeDIYer
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By HomeDIYer®

Price:
$12.19 USD
Stock:
In stock (500 units), ready to be shipped

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Description

S3M Timing Belt Pulley with Expansion Sleeve — Precise, Slip-Free Power Transmission

When your CNC router, 3D printer, or automation rig demands repeatable, backlash-free motion, a loose or misaligned pulley is the first thing that kills accuracy. Engineers and makers who need a reliable S3M timing belt pulley with expansion sleeve can stop shimming and start building — the integrated tension sleeve locks the pulley to the shaft without set screws that loosen under vibration.

Each pulley is machined from aluminum alloy with an anodized finish, featuring the S3M tooth profile (3 mm pitch) and a 16 mm belt-contact width. Tooth counts span 24T to 80T, and sleeve bore options range from 5 mm to 32 mm (approximately 0.197 in to 1.260 in), covering the most common motor and drive shaft diameters used in light-to-medium automation.

Typical use cases include desktop CNC gantry drives requiring an S3M 24T expansion sleeve pulley for compact axis travel, robotics joint actuators where a 3M timing pulley with tension sleeve eliminates shaft play, and conveyor or indexing systems that benefit from the tool-free bore adjustment of an S3M 80T pulley with expansion sleeve.

⚙️ Compatible with: S3M open-end and closed-loop timing belts, 16 mm belt width, 3 mm pitch. Verify shaft diameter against the Sleeve Bore option before ordering.

✅ Key Features of These S3M Timing Belt Pulleys with Expansion Sleeve

🔩 Expansion/Tension Sleeve Locking

The integrated sleeve clamps concentrically around the shaft when tightened, distributing clamping force evenly and eliminating the shaft damage caused by traditional set screws.

📐 Wide Tooth Count Range (24T – 80T)

Select from 21 tooth-count options to dial in your exact gear ratio for speed reduction or torque multiplication across CNC, robotics, and conveyor applications.

🎯 S3M Tooth Profile, 3 mm Pitch

The synchronous S3M profile ensures positive engagement with no belt slip, maintaining positional accuracy critical for stepper and servo-driven axes.

📏 16 mm Teeth Width

The 16 mm belt-contact face provides a stable tracking surface that reduces belt wander and lateral load on bearings compared to narrower pulleys.

⚡ Broad Bore Compatibility (5 – 32 mm)

Available sleeve bore sizes cover motor shafts from 5 mm up to 32 mm, including the common 6.35 mm (1/4 in) imperial size, making these pulleys suitable for both metric and inch-standard motors.

🏗️ Aluminum Alloy Construction

Lightweight yet rigid aluminum alloy body keeps rotational inertia low — an advantage in high-acceleration servo and stepper applications where mass matters.

📐 Technical Specifications — S3M Timing Belt Pulley

Belt Profile S3M (Synchronous, 3 mm pitch)
Teeth Width 16 mm
Tooth Count 24T – 80T (see variant options)
Sleeve Bore 5 mm – 32 mm (see variant options)
Material Aluminum alloy
Locking Method Expansion / tension sleeve
Pitch Diameter See variant options
Outer Diameter See variant options
Flange See variant options
Quantity per Order 1 piece

❓ Frequently Asked Questions

How do I choose the right tooth count for my application?

Tooth count determines your drive ratio. Divide the driven pulley tooth count by the driving pulley tooth count to get the ratio. For example, a 24T drive pulley paired with a 48T driven pulley gives a 2:1 reduction, halving speed and doubling torque. Match the tooth count to your required belt length and center distance as well.

What sleeve bore size should I select for my motor shaft?

Measure your motor or drive shaft diameter with calipers before ordering. Common sizes include 5 mm, 6 mm, 6.35 mm (1/4 in), 8 mm, 10 mm, 12 mm, and larger. The expansion sleeve accommodates the selected bore; it cannot be re-bored after manufacture, so confirm your shaft diameter first.

How does the expansion sleeve lock onto the shaft?

The expansion sleeve uses a tapered or split-collar mechanism: tightening the clamping screws compresses the sleeve radially against the shaft. This distributes clamping force evenly around the shaft circumference, preventing the shaft damage and loosening common with single-point set screws — especially under reversing or vibration loads.

Is this pulley compatible with standard S3M timing belts?

Yes. These pulleys are designed for S3M open-end and closed-loop timing belts with a 3 mm pitch and 16 mm width. Ensure your belt width matches the 16 mm teeth width of this pulley. Using a narrower belt is possible but reduces load capacity; a wider belt will not seat correctly.

Can I use this pulley with a stepper motor or servo motor?

Yes. The expansion sleeve design is well-suited to both stepper and servo motors. The concentric clamping eliminates the shaft runout introduced by off-center set screws, which is particularly important for servo systems with encoder feedback where shaft eccentricity causes position errors.

What is the corrosion resistance of these pulleys?

The aluminum alloy body provides good resistance to oxidation in typical indoor workshop and light industrial environments. For high-humidity or outdoor applications, consider applying a light coating of dry lubricant or corrosion inhibitor to the bore and mating surfaces. These pulleys are not rated for immersion or highly corrosive chemical environments.

How do I confirm the correct pulley before adding to cart?

Select your required Number of Teeth (e.g., S3M24T through S3M80T) and your Sleeve Bore diameter from the dropdowns above. Cross-reference the tooth count with your belt length and center distance calculation, and verify the bore matches your shaft diameter. If you need a bore size not listed, contact us before ordering.

🛒 Select your Number of Teeth and Sleeve Bore above, then add to cart.

 

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