L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt
L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt
L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt
L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt
L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt
L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt
L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt
L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt
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L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive BeltL Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive BeltL Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive BeltL Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive BeltL Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive BeltL Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive BeltL Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive BeltL Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt

L Type Closed Loop Timing Belt 341L–360L | Width 1/2" to 1-1/2" | 3/8" Pitch Synchronous Drive Belt

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L Type Closed Loop Timing Belt 341L–360L — Precise Synchronous Drive for CNC, 3D Printers & Industrial Equipment

When a slipping or worn drive belt causes positioning errors on your CNC router, 3D printer, or conveyor system, the entire workflow grinds to a halt. Engineers, makers, and maintenance technicians who rely on repeatable motion control need a closed loop timing belt that holds tooth engagement under load — without stretching or skipping teeth mid-run.

Each belt in this listing is an L-type (Light series) closed loop synchronous timing belt with a standard 9.525mm (3/8") pitch. Available in six pitch lengths — 341L (≈34.1", ≈866mm), 345L (≈34.5", ≈876mm), 350L (≈35.0", ≈889mm), 352L (≈35.2", ≈894mm), 355L (≈35.5", ≈902mm), and 360L (≈36.0", ≈914mm) — and four widths: 12.7mm (1/2"), 20mm (3/4"), 25mm (1"), and 38mm (1-1/2"). Belts are sold individually (1 pc) or as a pair (2 pcs). Construction is typically neoprene rubber with fiberglass or steel tension cord reinforcement and trapezoidal teeth.

These L-type synchronous drive belts are well suited for CNC machine axis drives, 3D printer motion systems, light conveyor drives, and general power transmission applications where slip-free timing is required. The trapezoidal tooth profile ensures positive engagement with standard L-profile pulleys, making them a reliable choice for replacement timing belt applications in workshop and industrial settings.

🔗 Compatibility: Fits any L-profile (3/8" pitch) timing pulley or sprocket following the ANSI/RMA inch-series trapezoidal tooth standard. Verify belt length (341L–360L) and width (12.7 / 20 / 25 / 38mm) match your pulley specifications before ordering.

✅ Key Features of These L Type Closed Loop Timing Belts

  • ⚙️Trapezoidal Tooth Profile — Standard L-series tooth geometry provides positive, slip-free engagement with L-profile pulleys for accurate synchronous drive performance in CNC and automation systems.
  • 📏Six Length Options — Available in 341L, 345L, 350L, 352L, 355L, and 360L pitch lengths (≈866–914mm / ≈34.1"–36.0"), covering a range of center distances for replacement timing belt applications.
  • ↔️Four Width Choices — Select 12.7mm (1/2"), 20mm (3/4"), 25mm (1"), or 38mm (1-1/2") to match your pulley face width and torque requirements across light to medium-duty drives.
  • 🔩Reinforced Tension Cord — Fiberglass or steel cord reinforcement resists elongation under cyclic loading, maintaining consistent belt tension and tooth pitch over extended service in 3D printer timing belt and conveyor applications.
  • 🔄Closed Loop (Endless) Construction — No joints or splices means uniform stiffness around the full circumference, eliminating the vibration and wear points associated with laced or open-ended belts.
  • 🏭Broad Application Range — Suitable for CNC router axis drives, laser cutter gantries, 3D printer motion systems, light conveyor drives, and general power transmission where a synchronous drive belt with repeatable positioning is required.

📐 Technical Specifications — L Type Synchronous Timing Belt

Belt Type L (Light) Series — Closed Loop Synchronous Timing Belt
Tooth Profile Trapezoidal (inch-series, ANSI/RMA standard)
Pitch 9.525mm (3/8")
Available Lengths 341L (≈866mm / ≈34.1"), 345L (≈876mm / ≈34.5"), 350L (≈889mm / ≈35.0"), 352L (≈894mm / ≈35.2"), 355L (≈902mm / ≈35.5"), 360L (≈914mm / ≈36.0")
Available Widths 12.7mm (1/2"), 20mm (3/4"), 25mm (1"), 38mm (1-1/2")
Construction Neoprene rubber body, fiberglass or steel tension cord reinforcement (typically)
Tooth Count See variant options (varies by length; L-pitch: teeth = pitch length ÷ 10 × 10 ÷ 3/8")
Quantity per Order 1 pc or 2 pcs (select Qty option)
Compatible Pulleys L-profile timing pulleys, 3/8" pitch (ANSI/RMA inch-series)
Typical Applications CNC drives, 3D printer motion systems, conveyor drives, general power transmission
Operating Temperature Contact us to confirm
Country of Origin See variant options
⚠️ Before ordering: Confirm your pulley's tooth pitch is 3/8" (9.525mm) L-profile. The belt length designation (e.g., 341L) refers to pitch circumference in tenths of an inch — not the physical outside length. If you are unsure which size fits your machine, contact us with your pulley tooth count and center distance.

❓ Frequently Asked Questions

How do I choose the right L-type timing belt length?

The number in the belt designation refers to the pitch length in tenths of an inch. For example, 341L means the belt is typically 34.1 inches (≈866mm) in pitch circumference. To find the correct size, measure your existing belt's pitch circumference, or calculate: (center distance × 2) + (circumference of both pulleys). When in doubt, size up rather than down to allow for tensioner adjustment.

What pitch do L-type timing belts use?

L-type (Light series) timing belts use a standard pitch of 9.525mm (3/8") between tooth centers. This is a widely adopted inch-series trapezoidal tooth standard compatible with L-profile pulleys and sprockets. Do not mix with metric pitch belts (e.g., HTD 3M, 5M) — the tooth profiles are not interchangeable.

What widths are available and how do I choose the right one?

These belts are available in 12.7mm (1/2"), 20mm (3/4"), 25mm (1"), and 38mm (1-1/2"). Wider belts generally handle higher torque loads. Match the belt width to your pulley flange width — the belt should be slightly narrower than the pulley face to allow for tracking. For light-duty CNC or 3D printer drives, 12.7mm or 20mm is typically sufficient. For heavier conveyor or industrial drives, 25mm or 38mm is generally recommended.

What load or torque can these timing belts handle?

Load capacity depends on belt width, operating speed, pulley diameter, and wrap angle. Wider belts (25mm and 38mm) are generally suited for higher-torque applications. In most cases, L-series belts are rated for light to medium power transmission. For precise load ratings specific to your drive design, contact us to confirm suitability for your application.

Can these belts be used outdoors or in wet environments?

These closed loop timing belts are typically constructed from neoprene rubber with reinforced tension cords, which offers moderate resistance to moisture and mild chemicals. They are generally not recommended for prolonged submersion or highly corrosive chemical environments. For outdoor installations, shielding the belt from direct UV exposure will help extend service life.

Are these belts compatible with standard L-profile pulleys?

Yes. L-type timing belts follow the ANSI/RMA inch-series trapezoidal tooth profile standard and are compatible with any L-profile timing pulley or sprocket with a 3/8" (9.525mm) pitch. Always verify that the pulley tooth count and belt pitch length match your drive geometry before installation.

What is the difference between ordering 1 pc vs 2 pcs?

The Qty(pcs) option lets you purchase either a single belt or a matched pair. Ordering 2 pcs is useful for dual-axis CNC systems, parallel-shaft conveyor drives, or keeping a spare on hand for quick replacement. Both pieces in a 2-pc order are the same size and width as selected.

How do I install a closed loop timing belt correctly?

Closed loop (endless) timing belts require no joining or splicing. To install: loosen the tensioner or motor mount to reduce center distance, slip the belt over both pulleys, then re-tension to the manufacturer's recommended deflection. Proper tension is important — too loose causes tooth skipping under load; too tight accelerates bearing and belt wear. Align pulleys carefully to prevent edge wear.

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

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