25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt
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25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt

25T Timing Belt Smooth Tooth Drive Pulley GT2 Closed Timing-Synchronous Belt

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Price:
$3.32 USD
Stock:
In stock (500 units), ready to be shipped

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Description

GT2 25-Tooth Timing Belt Pulley & Closed Synchronous Belt — Precision Drive for DIY Automation

When your 3D printer skips steps, your CNC router loses position, or your robotics project demands repeatable motion, the root cause is often a mismatched or worn drive component. Makers, engineers, and workshop builders who need slip-free, synchronous power transmission will find this GT2 25-tooth timing belt pulley and closed synchronous belt set a reliable foundation for any linear or rotary drive system.

This listing covers two product families: GT2 25-tooth synchronous pulleys (aluminum alloy body, available in BF-type and K-type bore configurations with bore diameters from 4 mm to 8 mm / 0.16 in to 0.31 in) and GT2 closed-loop rubber timing belts (available in 6 mm / 0.24 in and 10 mm / 0.39 in widths, with loop lengths ranging from 98 mm to 1,524 mm / 3.86 in to 60 in). Open-ended belt stock sold by the metre is also available in the same width options.

Typical use cases include GT2 belt drive upgrades for FDM 3D printers (Ender, Voron, CoreXY platforms), CNC router X/Y axis drives, pick-and-place machine linear stages, and small robotic arm joint drives — all applications where a GT2 closed timing belt and matching 25-tooth pulley deliver consistent tooth engagement and low backlash.

✅ Compatible with GT2 2 mm pitch timing belts in 6 mm and 10 mm widths. Pulley bore options: 4 mm, 5 mm, 6 mm, 6.35 mm, 7 mm, 8 mm. Select your typology, bore/length, and width above.

✅ Key Features of These GT2 25T Timing Belt Pulleys & Synchronous Belts

⚙️GT2 2 mm Pitch Profile — Standard GT2 tooth geometry ensures full compatibility with GT2 belts across all major 3D printer and CNC platforms, delivering consistent tooth engagement and minimal backlash.
🔩Multiple Bore Options (BF & K-Type) — BF-type pulleys accept set-screw shaft locking; K-type pulleys feature a keyway slot. Bore sizes from 4 mm to 8 mm (0.16–0.31 in) cover the most common motor shaft diameters.
📏Wide Belt Length Selection — Closed-loop belts span 98 mm to 1,524 mm (3.86–60 in) in 6 mm and 10 mm widths, covering short CoreXY loops to long-travel linear axes without custom cutting.
🏗️Aluminum Alloy Pulley Body — Lightweight yet rigid aluminum construction keeps rotational inertia low while resisting deformation under belt tension, suitable for continuous-duty motion applications.
🔄Rubber Closed-Loop Belt Construction — Fiber-reinforced rubber belt body provides flexibility, vibration damping, and resistance to stretching under normal operating loads for reliable synchronous drive.
📦Open-Ended Belt Stock Available — Need a custom length? Select the open-ended timing belt option (sold per metre) in 6 mm or 10 mm width to cut to your exact requirement.

📐 Technical Specifications — GT2 Timing Belt Pulley & Synchronous Belt

Belt Profile GT2 (2 mm pitch)
Pulley Tooth Count 25 teeth
Pulley Material Aluminum alloy
Pulley Bore Types BF-type (set screw) / K-type (keyway)
Bore Diameter Options 4 mm / 5 mm / 6 mm / 6.35 mm / 7 mm / 8 mm
Belt Width Options 6 mm (0.24 in) / 10 mm (0.39 in)
Closed Belt Loop Length Range 98 mm – 1,524 mm (3.86 in – 60 in)
Belt Material Fiber-reinforced rubber
Open-Ended Belt Available per metre, 6 mm or 10 mm width
Flange See variant options
Surface Finish See variant options

❓ Frequently Asked Questions

How do I choose the right bore size for my stepper motor shaft?

Measure your motor shaft diameter with a caliper. Common NEMA 17 motors use a 5 mm shaft; NEMA 23 motors typically use 6.35 mm (1/4 in) or 8 mm shafts. Select the matching bore option — BF-type for a set-screw lock, K-type if your shaft has a keyway groove.

What is the difference between BF-type and K-type pulleys?

BF-type pulleys are secured to the shaft using one or two radial set screws, making them easy to install and reposition. K-type pulleys have a keyway slot that mates with a key on the shaft, providing a more positive rotational lock suitable for higher-torque applications.

How do I measure the correct closed belt loop length for my machine?

For a two-pulley drive, the loop length is approximately: 2 × center distance + π × pulley pitch diameter. For a GT2 25-tooth pulley the pitch diameter is about 15.92 mm. Add a small amount for tensioner travel. When in doubt, select the next size up and use a belt tensioner to take up slack.

Are these belts and pulleys compatible with other GT2 products from different brands?

Yes. GT2 is a standardized 2 mm pitch profile. These pulleys and belts are dimensionally compatible with GT2 components from other manufacturers, including those used on popular 3D printer platforms such as Ender 3, Voron, and RatRig builds.

How strong is the closed-loop belt under tension?

The fiber-reinforced rubber construction resists elongation under normal 3D printer and light CNC loads. For heavy-duty applications with high belt tension or rapid acceleration, the 10 mm wide belt variant offers greater load capacity than the 6 mm version due to its larger cross-section.

Can I use the open-ended belt stock to make a custom-length closed loop?

Open-ended belt stock is sold per metre and is intended for applications where the belt runs along a fixed track (e.g., CoreXY carriage drives anchored at both ends). It is not designed to be joined into a closed loop in the field — for closed-loop applications, select the appropriate pre-formed closed belt length from the Ring Closed Timing Belt variants.

What pulley pitch diameter does a GT2 25-tooth pulley have?

A GT2 25-tooth pulley has a pitch diameter of approximately 15.92 mm (0.627 in), calculated as: tooth count × pitch / π = 25 × 2 / π ≈ 15.92 mm. This value is useful for calculating belt loop lengths and drive ratios.

🛒 Select your typology, belt length or bore size, and width above, then add to cart.

 

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