H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)
H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)
H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)
H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)
H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)
H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)
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H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)

H-Type Timing Belt 12.7mm Pitch — Closed Loop Rubber Synchronous Belt (20mm & 25mm Wide)

HomeDIYer
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By HomeDIYer®

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$8.01 USD
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In stock (500 units), ready to be shipped

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Description

 

H-Type Closed Loop Rubber Timing Belt — 12.7mm Pitch for Reliable Power Transmission

When a slipping V-belt or mismatched drive component brings your machine to a halt, you need a replacement you can count on. These H-type closed loop rubber synchronous belts are built for engineers, machinists, hobbyists, and DIYers who need precise, slip-free power transmission in CNC routers, 3D printers, conveyor systems, and general industrial drives.

Each belt features a 12.7mm (1/2") pitch H-series tooth profile and is available in two widths — 20mm (≈0.79") and 25mm (≈0.98") — with perimeter sizes ranging from 368.3mm (≈14.5") on the 145H up to 3225.8mm (≈127.0") on the 1270H. The closed-loop construction eliminates joints and splice points, and the rubber compound with fiber reinforcement delivers consistent tooth engagement across the full range of sizes.

Typical applications include CNC machine axis drives where positional accuracy matters, conveyor belt replacement in light industrial settings, and custom power transmission builds in robotics or automation projects — all scenarios where an H-type synchronous belt replacement is the go-to solution.

🔗 Compatible with standard H-series (1/2" pitch) timing pulleys. Match belt width (20mm or 25mm) to your pulley face width. Verify tooth count before ordering.
⚠️ If you are unsure of your belt size, measure the perimeter of your existing belt or count the teeth and multiply by 12.7mm. Contact us to confirm before ordering.

✅ Key Features of These H-Type Rubber Timing Belts

  • 📐12.7mm (1/2") H-Series Pitch — Matches the widely adopted H-profile tooth standard, making these belts a direct fit for H-type synchronous pulleys used across industrial and hobbyist CNC drive systems.
  • 🔄Closed-Loop Construction — No joints, no splices. The seamless loop design eliminates the weak points found in laced or joined belts, delivering smooth, consistent tooth engagement on every revolution.
  • 🧱Fiber-Reinforced Rubber Compound — The rubber body with internal fiber tensile cords resists stretching under load, maintaining accurate pitch spacing and reducing the need for frequent re-tensioning.
  • 📏Wide Size Selection — 145H to 1270H — With perimeters from 368.3mm to 3225.8mm and tooth counts from 29 to 254, you can find the exact closed loop timing belt replacement for most standard drive configurations.
  • ↔️Two Width Options: 20mm & 25mm — Select 20mm for lighter-duty or compact drives; choose 25mm for higher torque applications where greater belt face contact is needed for lateral stability.
  • ⚙️Slip-Free Synchronous Drive — Unlike V-belts, the positive tooth engagement of this rubber synchronous belt maintains a fixed speed ratio between driver and driven pulleys — critical for CNC axis positioning and conveyor indexing.

📐 Technical Specifications — H-Type Rubber Timing Belt

Belt Type H-Series Synchronous (Timing) Belt
Tooth Pitch 12.7mm (1/2")
Tooth Profile H-type (trapezoidal)
Construction Closed loop (seamless)
Material Rubber with fiber tensile cord reinforcement
Available Widths 20mm (≈0.79") and 25mm (≈0.98")
Size Range 145H – 1270H
Perimeter Range 368.3mm (≈14.5") to 3225.8mm (≈127.0")
Tooth Count Range 29 teeth (145H) to 254 teeth (1270H)
Pulley Compatibility Standard H-series timing pulleys (1/2" pitch)
Recommended Use CNC drives, conveyors, robotics, general power transmission
Operating Temperature Contact us to confirm
Quantity per Order 1 belt per variant

❓ Frequently Asked Questions

How do I choose the right H-type timing belt size?

The size designation (e.g., 200H) refers to the belt's pitch length in tenths of an inch — so 200H = 20.0 inches (508mm) in circumference. Measure your existing belt's outer perimeter or calculate: (center distance × 2) + (pulley circumferences). For example, a 300H belt has a 762mm (≈30.0") perimeter. Always verify the tooth count matches your pulley before ordering.

What does the 'H' designation mean in H-type timing belts?

'H' refers to the H-series tooth profile with a 12.7mm (1/2") pitch — the distance between adjacent tooth centers. This is a widely used standard in industrial and DIY power transmission applications, and these belts are generally interchangeable with other H-profile belts of the same size.

What load capacity can these timing belts handle?

Load capacity varies by belt width and length. Generally, 25mm-wide belts carry higher torque than 20mm-wide belts of the same length. For precise load ratings, consult your drive system's engineering specifications or contact us to confirm suitability for your specific application.

Are these timing belts suitable for outdoor or wet environments?

These belts are made from rubber with fiber reinforcement and are generally suitable for light moisture exposure. They are not rated for continuous submersion or highly corrosive chemical environments. For outdoor use, shield the belt from direct UV exposure and standing water where possible to extend service life.

What pulley standard do these belts fit?

These belts are designed to fit standard H-series (1/2" pitch) timing pulleys. They are compatible with pulleys following the H-profile tooth geometry used across most industrial and hobbyist drive systems in the US and internationally. Always confirm the pulley face width is at least as wide as the belt you select.

Should I choose 20mm or 25mm belt width?

Choose 20mm width for lighter-duty or space-constrained applications. Select 25mm width when you need higher torque transmission or greater lateral stability. Always match the belt width to your pulley's face width — the pulley should be at least as wide as the belt to ensure even load distribution.

How do I convert the H-type belt number to millimeters?

Multiply the number before 'H' by 2.54 to get the perimeter in millimeters. For example: 200H × 2.54 = 508mm (≈20.0"). Alternatively, use the perimeter values listed in our variant options — each size shows the exact circumference in mm so you can match it directly to your measurement.

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

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