2GT 20-60Teeth Timing Belt Idler Pulley Pitch 2mm Width 7/11mm Toothed Tensioner

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2GT 20-60Teeth Timing Belt Idler Pulley Pitch 2mm Width 7/11mm Toothed Tensioner

HomeDIYer

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By HomeDIYer®

Models: 2GT-20T

Tooth width: 7mm

Bore & Amount: 3mm & 1Pcs

Price:

$7.33 USD

Stock:

In stock (500 units), ready to be shipped

Quantity:

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2GT Toothed Idler Pulley — Precise Belt Tensioning for 2mm Pitch Drive Systems

When a loose timing belt causes missed steps, layer shifts, or erratic motion in your build, the root cause is often an inadequate tensioner. Engineers, robotics builders, and 3D printer enthusiasts who demand repeatable, slip-free motion need a toothed idler pulley that meshes cleanly with the belt and holds tension without creep. The 2GT toothed idler pulley is engineered for exactly this role, delivering consistent engagement across the full tooth profile.

Each 2GT toothed idler pulley is machined from aluminum alloy with a smooth-bore center and a flanged rim to keep the belt tracking true. Tooth counts range from 20T to 60T, belt widths are available in 7mm and 11mm, and bore diameters span 3mm to 15mm — covering the most common shaft sizes in compact drive systems. The 2mm pitch (GT2 profile) matches standard 2GT open and closed-loop belts directly.

Typical applications include CoreXY and Cartesian 3D printer belt paths where a toothed idler replaces a smooth idler to eliminate tooth-skip, CNC router gantry tensioning systems requiring zero-backlash engagement, and lightweight robotic arm joint drives where a 2GT toothed tensioner pulley maintains constant belt preload across a range of operating temperatures.

⚙️ Compatibility: Designed for 2GT / GT2 timing belts with 2mm pitch. Select 7mm tooth width for standard 6mm-wide belts; select 11mm tooth width for 9mm or 10mm-wide belts. Bore must match your shaft or spacer diameter — see variant options above.

✅ Key Features of These 2GT Toothed Idler Pulleys

🦷 Full GT2 Tooth Profile

Machined 2mm-pitch teeth mesh directly with 2GT belts, eliminating the tooth-skip risk associated with smooth idlers in high-speed or high-load paths.

📐 Wide Tooth Count Range

Available from 20T to 60T, allowing you to match the pulley diameter to your belt wrap angle and available clearance without compromising tension geometry.

🔩 Multi-Bore Options (3–15mm)

Bore sizes from 3mm to 15mm accommodate standard motor shafts, M3–M5 shoulder bolts, and custom spacer pins used in 3D printer and CNC idler mounts.

📏 Dual Belt Width Support

Choose 7mm tooth width for 6mm-wide 2GT belts or 11mm tooth width for wider 9–10mm belts, keeping the belt centered and flanges engaged on both sides.

🏗️ Aluminum Alloy Construction

Lightweight yet dimensionally stable, the aluminum body resists deformation under continuous belt tension and dissipates heat generated by high-cycle operation.

🔄 Drop-In Tensioner Replacement

Standard GT2 dimensions make these pulleys direct replacements for OEM idlers in Voron, Ender, RatRig, and similar motion systems — no modification required.

📐 Technical Specifications — 2GT Toothed Idler Pulley

Belt Profile	GT2 / 2GT (2mm pitch)
Tooth Count	20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 34T, 35T, 36T, 38T, 40T, 50T, 60T
Belt Width (Tooth Width)	7mm or 11mm — see variant options
Bore Diameter	3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 12mm, 15mm — see variant options
Pitch	2mm
Material	Aluminum alloy
Flange	Flanged on both sides
Outer Diameter	See variant options
Weight per Piece	See variant options
Quantity	1 piece per order (as selected)

❓ Frequently Asked Questions

What is the difference between a toothed idler pulley and a smooth idler pulley?

A toothed idler pulley has a GT2 tooth profile that meshes with the belt teeth, preventing any relative sliding between belt and pulley. A smooth idler simply contacts the back face of the belt. Toothed idlers are preferred on the tooth-side of the belt to avoid tooth deformation and maintain accurate positioning, while smooth idlers are used on the flat back side.

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

Select a tooth count that gives you adequate belt wrap angle (typically 90° or more) and fits within your available clearance. Smaller tooth counts (20T–30T) suit compact printer frames with tight idler mounts; larger counts (40T–60T) are used where a larger wrap angle or a specific belt path geometry is required. The pitch diameter increases with tooth count at a fixed 2mm pitch.

Which bore size should I choose?

Match the bore to your shaft or shoulder bolt diameter. Common choices are 3mm for M3 shoulder bolts, 5mm for standard 5mm motor shafts used as idler pins, and 8mm for larger structural pins. If you are using a bearing inside the pulley, select the bore that matches your bearing's outer diameter.

Is this pulley compatible with standard GT2 belts?

Yes. The 2GT / GT2 tooth profile with 2mm pitch is an industry-standard geometry. These pulleys are compatible with any 2GT open-loop or closed-loop belt of the matching width (6mm belt with 7mm tooth-width pulley; 9–10mm belt with 11mm tooth-width pulley).

Can this pulley be used as a tensioner in a CoreXY or Cartesian 3D printer?

Yes. These toothed idler pulleys are widely used in CoreXY printers (Voron, RatRig, etc.) and Cartesian printers (Ender series and derivatives) as belt-path idlers and tensioners. Verify the bore size matches your idler bolt and the tooth width matches your belt width before ordering.

What material is the pulley made from, and will it corrode?

The pulley body is machined from aluminum alloy, which forms a natural oxide layer that resists corrosion in typical indoor environments. For outdoor or high-humidity applications, a light coating of dry lubricant on the bore is recommended to prevent galvanic corrosion where the pulley contacts a steel shaft.

Do I need a bearing, or does the pulley spin on the bore directly?

These pulleys are supplied as bare aluminum bodies without a pre-installed bearing. You can press-fit a standard flanged or unflanged bearing into the bore, or mount the pulley directly onto a shoulder bolt with a PTFE or brass bushing. The bore tolerance is suitable for a light press-fit with standard metric bearings.

🛒 Select your Models, Tooth width, and Bore & Amount above, then add to cart.