HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt
HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt
HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt
HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt
HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt
HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt
HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt
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HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width BeltHTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width BeltHTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width BeltHTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width BeltHTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width BeltHTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width BeltHTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt

HTD-3M 12T-120T Timing Belt Pulley Without Step Bore 4-15mm, For 15mm Width Belt

HomeDIYer
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By HomeDIYer®

Price:
$3.66 USD
Stock:
In stock (500 units), ready to be shipped

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Description

HTD 3M Timing Belt Pulley — Precise Drive for CNC, Robotics & Automation

When your motion system demands repeatable, slip-free power transfer, a mismatched or poorly machined pulley becomes the weakest link. Engineers, makers, and machine builders working on CNC routers, 3D printers, robotic arms, and linear actuators need a pulley that holds tight tolerances without adding unnecessary bulk. These HTD 3M timing belt pulleys are designed for exactly that use case — delivering consistent tooth engagement across a wide range of tooth counts and bore sizes.

Each pulley is machined from aluminum alloy and features the HTD (High Torque Drive) 3M tooth profile — 3mm pitch, rounded tooth form — sized for 15mm wide timing belts. Tooth counts span from 12T to 120T, with outer diameters ranging from approximately 11.5mm (12T) to 114.6mm (120T). Bore options cover 4mm through 25mm (≈0.16"–0.98"), with a stepless (no-flange-step) bore design for clean shaft fitment.

Typical applications include CNC router X/Y axis drives, desktop 3D printer extruder and motion systems, lightweight robotic joint actuators, and DIY linear motion belt-drive builds. The 3M pitch is a popular choice for compact, high-speed low-torque drive systems where positional accuracy matters.

⚙️ Compatible with: HTD 3M timing belts, 15mm belt width. Verify bore diameter matches your shaft before ordering.

✅ Key Features of These HTD 3M Timing Belt Pulleys

  • 🔩Wide tooth count range — 12T to 120T available, covering compact high-speed drives to larger reduction setups in a single product line.
  • 📐HTD 3M tooth profile — 3mm pitch, rounded tooth form for smooth engagement and reduced backlash compared to trapezoidal profiles.
  • 🎯Stepless (no-step) bore — Clean through-bore design without a flange step, allowing flexible shaft mounting and easy set-screw or keyway modification.
  • 🔧Multiple bore sizes — 4mm through 25mm bore options to match common motor shafts, lead screws, and drive shafts used in CNC and robotics builds.
  • ⚖️Aluminum alloy construction — Lightweight yet rigid material keeps rotational inertia low, suitable for high-cycle motion applications.
  • 📏15mm belt width rated — Tooth width matched to standard 15mm HTD 3M belts for full tooth contact and even load distribution.

📐 Technical Specifications — HTD 3M Timing Belt Pulley

Belt Profile HTD 3M (3mm pitch, rounded tooth)
Belt Width Compatibility 15mm
Tooth Count (Types) 12T, 15T, 16T, 18T, 20T, 22T, 24T, 25T, 26T, 28T, 30T, 32T, 35T, 36T, 38T, 40T, 42T, 45T, 46T, 48T, 50T, 55T, 60T, 65T, 70T, 72T, 80T, 90T, 100T, 120T
Bore Diameter 4mm, 5mm, 6mm, 6.35mm, 7mm, 8mm, 10mm, 11mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 19mm, 20mm, 22mm, 25mm (see variant options)
Outer Diameter (OD) See variant options (approx. 11.5mm for 12T to 114.6mm for 120T)
Step / Flange Without step (stepless bore)
Material Aluminum alloy
Finish See variant options
Quantity per Order 1 piece
Weight See variant options

❓ Frequently Asked Questions

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

Tooth count determines the pulley's pitch diameter and affects your drive ratio. For a 1:1 drive, use matching tooth counts on both pulleys. For speed reduction or torque multiplication, pair a smaller driver pulley with a larger driven pulley. Common CNC and 3D printer setups use 20T–40T pulleys on motor shafts. Larger tooth counts (60T–120T) suit slower, higher-torque driven shafts.

What bore size should I select for my motor shaft?

Match the bore diameter to your motor or shaft diameter. Common NEMA 17 stepper motor shafts are 5mm; NEMA 23 shafts are typically 6.35mm or 8mm. Servo motors and DC motors vary — check your motor's datasheet. If you need a custom fit, select the closest bore and use a set screw or machine a keyway. Bore options here range from 4mm to 25mm.

Is this pulley compatible with standard HTD 3M timing belts?

Yes. These pulleys use the HTD 3M tooth profile (3mm pitch, rounded tooth form) and are designed for 15mm wide HTD 3M timing belts. Ensure your belt is also rated for 15mm width and HTD 3M profile for correct tooth engagement. Using a different pitch (e.g., GT2 2mm or 5M) will result in poor mesh and accelerated wear.

What is the difference between a stepped and stepless (without step) pulley?

A stepped pulley has a raised flange or shoulder on one or both sides of the tooth section to help retain the belt laterally. A stepless (without step) pulley has a clean, flat bore without this flange. Stepless designs offer more flexibility for custom mounting and are lighter, but you may need to manage belt tracking through tensioner alignment or use flanged idlers in your system.

How strong is an aluminum alloy pulley for my drive system?

Aluminum alloy pulleys are well-suited for light-to-medium duty CNC, 3D printing, and robotics applications. They offer a good strength-to-weight ratio and resist corrosion in typical indoor environments. For heavy industrial loads, high-shock applications, or continuous high-torque drives, consider whether a steel pulley would be more appropriate. For most maker and automation builds, aluminum is the standard choice.

Can I use these pulleys for a 3D printer or CNC router build?

Yes. HTD 3M pulleys are widely used in desktop CNC routers, laser cutters, and some 3D printer motion systems. The 3M pitch provides a good balance of tooth strength and compact size. Pair with a matching HTD 3M 15mm wide belt and appropriate idler pulleys for your axis design. Verify the bore matches your stepper or servo motor shaft before ordering.

Do these pulleys come with set screws or keyways?

The standard bore is a clean through-bore without step. Set screw holes or keyways are not pre-machined unless specified in the variant listing. If your application requires a set screw, this can typically be added with a drill and tap. Contact us to confirm if a specific variant includes set screw provisions.

🛒 Select your tooth count (Types) and bore diameter above, then add to cart.

 

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