H Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple Lengths
H Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple Lengths
H Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple Lengths
H Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple Lengths
H Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple Lengths
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H Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple LengthsH Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple LengthsH Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple LengthsH Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple LengthsH Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple Lengths

H Timing Belt Closed Loop — 12.7mm Pitch, 20mm & 25mm Width, Multiple Lengths

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H Timing Belt Closed Loop — Reliable 12.7mm Pitch Drive for CNC, Industrial & Automation Systems

When a slipping or mismatched drive belt brings your CNC router, conveyor, or automated assembly line to a halt, downtime costs money. Engineers, machine builders, and serious DIYers who need a dependable closed loop synchronous timing belt with a standard H-type tooth profile will find exactly what they need here — available in 20mm and 25mm widths across a wide range of tooth counts and circumference lengths.

Each belt is a single closed-loop unit with an H-profile tooth pitch of 12.7mm (1/2"). Available widths are 20mm (≈0.79") and 25mm (≈0.98"). Belt circumferences range from 368.3mm (≈14.5") at 29 teeth up to 3225.8mm (≈127.0") at 254 teeth — select your exact size from the variant dropdown above. Belt length in mm equals tooth count × 12.7mm.

Typical applications include CNC router X/Y axis drives, industrial conveyor systems, packaging machinery, 3D printer gantry systems, and general power transmission setups where a closed loop H-type synchronous belt is required. The consistent tooth pitch ensures accurate positioning and repeatable motion — critical for CNC timing belt replacement and automation drive belt applications.

🔗 Compatibility: Fits all standard H-series pulleys with 12.7mm (1/2") pitch. Match belt width (20mm or 25mm) to your pulley groove width. Tooth count × 12.7mm = belt circumference in mm.

✅ Key Features of These H-Type Closed Loop Synchronous Timing Belts

  • 📐Standard H Tooth Profile — 12.7mm (1/2") pitch matches all H-series pulleys for drop-in CNC timing belt replacement without modification.
  • 🔄Closed Loop Construction — Seamless endless loop eliminates splice weak points, delivering consistent tension and smooth power transmission in closed loop drive systems.
  • 📏Wide Size Range — 29 to 254 teeth (368mm–3226mm circumference) in a single product listing; choose your exact length from the size selector to avoid costly custom orders.
  • ↔️Two Width Options — 20mm width for lighter CNC and automation drives; 25mm width for higher-torque industrial conveyor belt and machinery applications.
  • 🏗️Fiber-Reinforced Tensile Layer — Internal cord construction resists elongation under load, maintaining accurate tooth engagement and positioning over extended service cycles.
  • ⚙️Synchronous Drive Accuracy — Positive tooth engagement eliminates slip, making these belts suitable for indexing, positioning, and any application where synchronous belt drive accuracy matters.

📐 Technical Specifications — H-Type Closed Loop Timing Belt

Belt Type H (Heavy) Synchronous Timing Belt
Tooth Pitch 12.7mm (1/2")
Tooth Profile H-type (trapezoidal)
Belt Form Closed Loop (Endless)
Available Widths 20mm (≈0.79") / 25mm (≈0.98")
Tooth Count Range 29 teeth – 254 teeth (see variant options)
Circumference Range 368.3mm (≈14.5") – 3225.8mm (≈127.0")
Belt Material See variant options / Contact us to confirm
Tensile Member See variant options / Contact us to confirm
Compatible Pulleys Standard H-series pulleys, 12.7mm pitch
Typical Applications CNC routers, conveyors, 3D printers, packaging machinery, automation drives
Quantity per Order 1 belt per unit
⚠️ Size Note: Belt circumference = tooth count × 12.7mm. Always verify your required circumference and pulley groove width before ordering. If you need a size not listed, contact us.

❓ Frequently Asked Questions

How do I choose the right belt length?

Match the belt circumference to your drive system's center distance and pulley tooth count. The circumference equals tooth count × 12.7mm. For example, a 40-tooth belt is 508mm (≈20.0"). Measure your existing belt or calculate using your pulley spacing and the formula: circumference = 2 × center distance + π × (D1 + D2) / 2. When in doubt, size up slightly and adjust tension.

What width should I choose — 20mm or 25mm?

Width selection depends on your load requirements and pulley flange width. The 20mm belt is generally suited for lighter-duty CNC and automation applications. The 25mm belt typically handles higher torque and is better for heavier industrial conveyor or machinery drives. Always confirm your pulley groove width matches the belt width before ordering.

What is the load capacity of these timing belts?

H-type timing belts are generally rated for moderate to heavy power transmission. Exact tensile load capacity depends on belt width, operating speed, and pulley diameter. The 25mm width typically handles higher torque than the 20mm. Contact us to confirm load ratings for your specific application.

Can these belts be used outdoors or in wet environments?

These belts are generally suitable for indoor industrial environments. Neoprene-based timing belts typically offer moderate resistance to oil and moisture. Prolonged exposure to UV, harsh chemicals, or standing water may reduce service life. For outdoor or washdown applications, contact us to confirm suitability before ordering.

Are these belts compatible with standard H-type pulleys?

Yes. These belts follow the standard H tooth profile with a 12.7mm (1/2") pitch, compatible with any standard H-series pulley. Verify that your pulley groove width matches the belt width (20mm or 25mm) before installation. No modification is needed for direct replacement of existing H-type belts.

How do I convert belt length from mm to inches?

Divide the length in mm by 25.4. Quick reference: 508mm = 20.0"; 762mm = 30.0"; 1016mm ≈ 40.0"; 1524mm = 60.0"; 2540mm = 100.0". All variant sizes are listed with both tooth count and mm circumference in the size selector above.

What is the belt material and construction?

These closed-loop timing belts are typically constructed with a neoprene rubber body and a fiberglass or steel cord tensile member, providing dimensional stability and resistance to elongation under load. This construction is standard for H-type synchronous belts used in CNC and industrial applications. Contact us to confirm exact material specifications for your order.

🛒 Select your size and width above, then add to cart — ships from our US warehouse.

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