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home > H Type Double-Sided Timing Belt (DH) — Closed Loop, 12.7mm Pitch | 20/25/30/38/50mm Wide > H Type Double-Sided Timing Belt (DH) — Closed Loop, 12.7mm Pitch | 20/25/30/38/50mm Wide

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H Type Double-Sided Timing Belt (DH) — Closed Loop, 12.7mm Pitch | 20/25/30/38/50mm WideH Type Double Sided Timing Belt (DH) Closed Loop for Reliable Synchronous Power Transmission When a standard single sided belt can't handle your serpentine drive, counter rotation setup, or multi axis CNC system, you need a belt that works from both sides. Engineers, machine builders, and serious DIYers who run complex drive trains rely on the H type double sided timing belt (DH) to keep every shaft in sync without slippage, without guesswork. Each

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H Type Double-Sided Timing Belt (DH) — Closed Loop for Reliable Synchronous Power Transmission

When a standard single-sided belt can't handle your serpentine drive, counter-rotation setup, or multi-axis CNC system, you need a belt that works from both sides. Engineers, machine builders, and serious DIYers who run complex drive trains rely on the H type double-sided timing belt (DH) to keep every shaft in sync — without slippage, without guesswork.

Each belt is a closed-loop H-profile (DH) timing belt with a 12.7mm pitch and teeth on both the inner and outer surfaces. Available in five widths — 20mm (≈3/4"), 25mm (≈1"), 30mm (≈1-3/16"), 38mm (≈1-1/2"), and 50mm (≈2") — and perimeters ranging from 584.2mm (≈23.0") at 230DH up to 4318mm (≈170.0") at 1700DH. Sold individually (1 PCS per order).

Typical applications include CNC router and laser cutter drive systems, 3D printer Z-axis and multi-head setups, industrial conveyor serpentine drives, and textile or packaging machinery requiring synchronized counter-rotation. The double-sided tooth profile makes this H type double-sided timing belt the go-to choice wherever a single belt must engage pulleys on both faces.

ℹ️ Compatible with standard H-profile (12.7mm pitch) timing pulleys. Verify your pulley groove width matches your selected belt width (20 / 25 / 30 / 38 / 50mm) before ordering.

⚠️ Size confirmation: The DH number = number of teeth. Perimeter (mm) = teeth × 12.7mm. Double-check your required perimeter and width against your machine specs before adding to cart.

✅ Key Features of These H Type Double-Sided Timing Belts

⚙️Dual-Face Tooth Profile — Teeth on both inner and outer surfaces enable serpentine and counter-rotation drive configurations that single-sided belts cannot achieve.
📐12.7mm H-Type Pitch — Standardized H-profile pitch ensures drop-in compatibility with widely available H-type timing pulleys used in CNC machines, 3D printers, and industrial drives.
📏Wide Size Selection — Five widths (20–50mm) and perimeters from 584mm to 4318mm cover a broad range of closed-loop drive applications without custom fabrication.
🔩Reinforced Construction — Typically built with a neoprene body and fiberglass or steel tension cord, providing dimensional stability and resistance to stretch under load.
🔄Closed-Loop Design — Seamless loop construction eliminates the weak points of joined or laced belts, delivering consistent tooth engagement and quieter operation.
🏭Broad Application Range — Suited for CNC routers, laser cutters, multi-axis 3D printers, conveyor serpentine drives, and packaging machinery requiring synchronized double-sided power transmission.

📐 Technical Specifications — H Type DH Closed-Loop Timing Belt

Belt Type	H Type Double-Sided (DH) Closed-Loop Timing Belt
Pitch	12.7mm (H-profile)
Available Widths	20mm (≈3/4"), 25mm (≈1"), 30mm (≈1-3/16"), 38mm (≈1-1/2"), 50mm (≈2")
Perimeter Range	584.2mm (≈23.0") — 4318mm (≈170.0")
Teeth Range	46 Teeth (230DH) — 340 Teeth (1700DH)
Tooth Profile	Double-sided (teeth on inner and outer surfaces)
Material	Typically neoprene rubber with fiberglass or steel tension cord
Compatible Pulleys	Standard H-type (12.7mm pitch) timing pulleys
Packing Quantity	1 PCS per order
Country of Origin	See variant options

❓ Frequently Asked Questions

How do I choose the right perimeter (DH number) for my application?

The DH number equals the number of teeth. Multiply teeth by pitch (12.7mm) to get the belt perimeter. For example, 230DH = 230 teeth × 12.7mm ÷ 2 = 584.2mm perimeter (≈23.0"). Measure your existing belt or calculate center distance + pulley circumferences. When in doubt, size up — a slightly longer belt is easier to tension than one that is too short.

What width should I select for my drive system?

Width determines load capacity. Generally, wider belts carry more torque. Match the width to your existing pulley groove width. Available widths are 20mm (≈3/4"), 25mm (≈1"), 30mm (≈1-3/16"), 38mm (≈1-1/2"), and 50mm (≈2"). Confirm your pulley flange width before ordering.

What load or torque can these belts handle?

Load capacity depends on width, speed, and number of teeth in mesh. Wider belts (38–50mm) generally support higher torque applications. For precise load ratings, consult the belt manufacturer's engineering tables or contact us to confirm suitability for your specific drive.

Can these timing belts be used outdoors or in wet environments?

These belts are typically made from neoprene rubber with fiberglass or steel cord reinforcement, which provides moderate resistance to moisture and mild chemicals. They are generally not recommended for prolonged submersion or exposure to harsh solvents. For outdoor use, protect from direct UV exposure where possible to extend service life.

Are these belts compatible with standard H-type pulleys?

Yes. These are H-profile (12.7mm pitch) double-sided (DH) closed-loop belts, compatible with standard H-type timing pulleys. The double-sided tooth profile allows power transmission from both the inner and outer belt surfaces, making them suitable for serpentine and reverse-bend drive configurations.

What does 'double-sided' (DH) mean and when do I need it?

A double-sided (DH) 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 drives, counter-rotation setups, or multi-axis CNC systems where a single belt must engage multiple shafts in different directions.

How do I convert the perimeter from mm to inches?

Divide the mm value by 25.4. For example: 584.2mm ÷ 25.4 ≈ 23.0"; 1270mm ÷ 25.4 = 50.0"; 2540mm ÷ 25.4 = 100.0". Each product variant lists both mm and teeth count to help you match your existing belt.

🛒 Select your width and model (perimeter & teeth) above, then add to cart — ships from our US warehouse.

H Type Double-Sided Timing Belt (DH) — Closed Loop, 12.7mm Pitch | 20/25/30/38/50mm Wide

Name: H Type Double-Sided Timing Belt (DH) — Closed Loop, 12.7mm Pitch | 20/25/30/38/50mm Wide
Brand: leseauxdelinval.fr
SKU: 60588939464
Price: 23.95 USD
Availability: InStock
Rating: 4.2133 (1821 reviews)