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DH Double-Sided Timing Belt | 12.7mm Pitch | Closed Loop Rubber | 25mm & 30mm Wide main image 0

DH Double-Sided Timing Belt | 12.7mm Pitch | Closed Loop Rubber | 25mm & 30mm Wide main image 1

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DH Double-Sided Timing Belt | 12.7mm Pitch | Closed Loop Rubber | 25mm & 30mm WideDH Double Sided Timing Belt 12. 7mm Pitch Closed Loop for CNC, Industrial & Automation Drives When a single sided belt just won't cut it because your drive system needs to engage pulleys on both faces, reverse direction mid run, or power multiple axes from one loop you need a double sided timing belt. Machinists, CNC builders, robotics engineers, and industrial maintenance teams rely on DH series double sided timing belts to keep complex drive trains

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DH Double-Sided Timing Belt — 12.7mm Pitch Closed Loop for CNC, Industrial & Automation Drives

When a single-sided belt just won't cut it — because your drive system needs to engage pulleys on both faces, reverse direction mid-run, or power multiple axes from one loop — you need a double-sided timing belt. Machinists, CNC builders, robotics engineers, and industrial maintenance teams rely on DH-series double-sided timing belts to keep complex drive trains running in sync without slippage or backlash.

Each belt is a closed-loop (endless) rubber timing belt with the standard H-series tooth profile on both inner and outer surfaces. The pitch is 12.7mm (1/2"), available in widths of 25mm (≈1") and 30mm (≈1-3/16"). Belt lengths range from 230DH (≈23.0", ≈584mm pitch circumference) up to 1700DH (≈170.0", ≈4318mm), covering a wide range of center distances and drive configurations. Sold individually (1 PCS per order).

Typical applications include CNC router and mill drive systems requiring reverse-direction power transmission, serpentine conveyor drives where the belt wraps around multiple idler and drive pulleys, and industrial automation equipment such as pick-and-place machines, packaging lines, and multi-axis gantry systems that demand precise, synchronous motion on both belt faces.

🔗 Compatibility: Designed for standard H-series timing pulleys with 12.7mm (1/2") pitch. Match belt width (25mm or 30mm) to your pulley face width. Verify pulley tooth profile before ordering.

⚠️ Closed-loop belt: This is an endless belt with no open ends. Installation requires removing a shaft or bearing to slide the belt over the pulleys. Confirm your drive layout allows this before purchasing.

✅ Key Features of These DH Double-Sided Timing Belts

⚙️ Dual-Face Tooth Profile — Teeth on both inner and outer surfaces allow simultaneous engagement of multiple pulleys, enabling serpentine and reverse-direction drive configurations without additional idlers.
📏 Standard H-Series 12.7mm Pitch — Interchangeable with any H-type timing pulley system; the 1/2" pitch is one of the most widely used standards in CNC, industrial conveyor, and automation drive design.
🔄 Closed-Loop Endless Construction — No splice, no joint, no weak point. The seamless loop delivers consistent tension and synchronous motion throughout the full belt circumference, reducing vibration in precision drive systems.
📐 Wide Size Selection — Available in 25mm and 30mm widths across lengths from 230DH to 1700DH, making it straightforward to find a drop-in replacement or spec a new closed-loop timing belt drive without custom fabrication.
🏭 Rubber Construction with Fiber Reinforcement — The rubber body provides flexibility and grip across the tooth profile, while internal cord reinforcement (typically fiberglass or polyester) resists elongation under load in industrial timing belt applications.
🔧 Direct Replacement Fit — DH-series designation follows standard industry sizing conventions, so this belt generally serves as a direct replacement for worn or broken double-sided H-pitch timing belts in existing machinery without drive system redesign.

📐 Technical Specifications — DH Double-Sided Closed-Loop Timing Belt

Belt Type	DH — Double-Sided Timing Belt (teeth on both faces)
Tooth Pitch	12.7mm (1/2") — H-series standard
Belt Width	25mm (≈1") or 30mm (≈1-3/16") — select via variant
Available Lengths	230DH to 1700DH (pitch circumference in tenths of an inch; e.g., 230DH ≈ 584mm / 23.0")
Construction	Closed-loop (endless) — no open ends or splices
Material	Rubber body with internal fiber cord reinforcement (typically fiberglass or polyester)
Tooth Profile	H-series trapezoidal, compatible with standard H-type timing pulleys
Drive Side	Both inner and outer surfaces (double-sided)
Quantity per Order	1 PCS
Tensile Strength	See variant options — varies by width and length
Operating Temperature	Contact us to confirm for your specific environment
Compatible Pulley Standard	H-series timing pulleys, 12.7mm pitch

❓ Frequently Asked Questions

How do I choose the right belt length for my application?

The DH number indicates the belt's pitch length in tenths of an inch. For example, 230DH = 23.0 inches (≈584mm) of pitch circumference. To find your size: measure your existing belt around the outside, or calculate (center distance × 2) + (sum of pulley pitch circumferences). When in doubt, size up — a slightly longer belt is generally easier to tension than one that's too short.

What does "double-sided" mean and when do I need it?

A double-sided timing belt has teeth on both the inner and outer surfaces. This allows the belt to drive pulleys on both sides simultaneously — useful in serpentine drive systems, reverse-direction drives, and multi-axis CNC setups where a single belt must engage two or more shafts. If your system only needs one drive face, a standard single-sided belt is typically sufficient.

What is the load capacity of this timing belt?

Load capacity depends on belt width, length, and operating speed. Generally, the 30mm-wide variants carry higher torque than the 25mm versions. For precise load ratings, refer to your drive system's engineering specs or contact us to confirm suitability for your application before ordering.

Can this belt be used outdoors or in wet environments?

The rubber construction offers moderate resistance to moisture and light oil exposure. However, prolonged immersion or exposure to harsh chemicals, UV radiation, or extreme temperatures may degrade performance over time. For outdoor or washdown environments, we recommend confirming suitability with your application requirements before ordering.

What pulley tooth profile is compatible with this belt?

This belt uses the standard H-series (1/2" pitch) trapezoidal tooth profile. It is compatible with H-type timing pulleys with a 12.7mm pitch. Ensure your pulleys match the H profile and the correct belt width (25mm or 30mm) for proper tooth engagement and tracking.

How do I select between 25mm and 30mm width?

Choose the width that matches your existing pulley face width. The 25mm belt is suitable for lighter-duty or space-constrained applications, while the 30mm belt handles higher torque loads. Always match belt width to pulley width — mismatched widths can cause tracking issues and premature wear.

Is this a closed-loop (endless) belt or an open-ended belt?

This is a closed-loop (endless) timing belt — it has no seam or joint. Installation requires removing a shaft or bearing to slide the belt over the pulleys. It is not an open-ended belt that can be cut to length. Confirm your drive layout allows belt installation before purchasing.

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

DH Double-Sided Timing Belt | 12.7mm Pitch | Closed Loop Rubber | 25mm & 30mm Wide

Name: DH Double-Sided Timing Belt | 12.7mm Pitch | Closed Loop Rubber | 25mm & 30mm Wide
Brand: tug-ottendorf-okrilla.de
SKU: 86731145477
Price: 27.17 USD
Availability: InStock
Rating: 4.889200000000001 (2178 reviews)