EP-L100 9.525MM Steel & Cast Iron Straight Bore Timing Pulley

With 10 to 120 tooth options under the same L100 part code structure, this L100 series allows engineers to specify the exact speed ratio they need without switching to a different pitch family. Whether the application demands a compact 10-tooth drive position for a servo-driven conveyor or a 120-tooth driven wheel for a low-speed indexing table, the L100 straight bore timing pulley delivers consistent pitch accuracy across the full range, simplifying design standardization and reducing spare parts inventory complexity in industrial facilities worldwide.

Steel construction (10 to 48 teeth) provides high tensile strength, excellent machinability for bore finishing, and reliable performance in dynamic, high-cycle drive applications. Cast Iron (49 to 120 teeth) delivers the damping characteristics and mass needed to stabilize larger-diameter straight bore timing pulley units against vibration-induced pitch error at the tooth-belt meshing point. Matching material to tooth count — and therefore to likely torque load — is standard engineering practice, and the L100 material split reflects this logic directly.

The L100 straight bore timing pulley series offers four distinct flange type codes — 6F, 6WF, 6W, and 6A — each suited to different belt-tracking and housing-clearance requirements. A flanged straight bore timing pulley (6F, 6WF) keeps the L-pitch timing belt centered on the pulley face without requiring external belt guides, reducing lateral belt wander especially in open-frame machines. The unflanged straight bore timing pulley variants (6W, 6A) are preferred where a fixed guide rail or housing provides lateral constraint, or where the drive arrangement requires easy belt removal without dismantling the pulley from the shaft.

The 9.525 mm pitch of the L Series is one of the most widely adopted standard timing belt pitches in global industrial machinery, recognized under both Imperial (L series) and interchangeable metric-inch standards. Timing belts and pulleys in the L100 series mate directly with L-profile belts from any major belt supplier conforming to ANSI/RMA or equivalent standards, ensuring belt replacement is never dependent on a single supply source. This broad belt availability makes the L100 straight bore timing pulley the practical choice for global maintenance teams who need an interchangeable, stocked product.

Unlike taper lock or QD bushing variants, the straight bore timing pulley arrives with a pre-machined through-bore at standard size, which the end-user or their machine shop can ream, bore, or keyway-mill to the precise shaft fit required. This flexibility eliminates the need to specify a completed bore size at the time of order, reducing procurement lead time significantly and making the L100 straight bore timing pulley the preferred stocking SKU for distributors who serve multiple customer applications from a single inventory holding.

Steel (10–48 Teeth) Straight Bore Timing Pulley

Carbon steel with a tensile strength typically in the 500–700 MPa range provides excellent machinability for precision tooth hobbing and bore finishing to tight tolerances on this straight bore timing pulley. The steel body is compatible with all standard keyway milling, bore reaming, and set-screw installation processes. Surface finishes may include black oxide, zinc phosphate, or clear lacquer depending on the operating environment. Steel straight bore timing pulley construction also makes these units suitable for applications requiring the timing pulley standard sizes to interface with stainless steel shafts via appropriate transition fits.

Cast Iron (49–120 Teeth) Straight Bore Timing Pulley

Grey cast iron (typically Grade 250 or equivalent) is used for the larger-tooth-count straight bore timing pulley variants. Cast iron's graphite flake microstructure provides natural self-damping of vibration transmitted through the timing belt, and the higher density contributes to smoother running at the low rotational speeds typical of large-diameter straight bore timing pulley units. Cast iron is also inherently resistant to galling, making it a practical material for pulleys that must be disassembled and reinstalled on a shaft multiple times in field service situations — a consideration for users ordering metric timing belt pulleys for maintenance stock.

Industrial Automation and CNC Machinery

CNC routers, laser cutters, and multi-axis automation systems require precise axis positioning that is repeatable to fractions of a millimetre. The zero-slip synchronous engagement of the L-series synchronized belt drive system — with the L100 straight bore timing pulley at its core — delivers the positional repeatability these systems require. The 9.525 mm pitch provides a good balance between compact drive dimensions and the tooth count needed for smooth multi-tooth engagement across the arc of contact on the drive pulley, reducing per-tooth load and extending belt service life in high-cycle automation environments.

Packaging and Food Processing Lines

Packaging machinery relies on synchronized belt drives to coordinate the timing of film feeding, sealing jaw activation, and product indexing. Any slip between the drive and driven pulley positions translates directly into misaligned seal positions, film waste, or rejected product. The L100 straight bore timing pulley series is widely used in form-fill-seal machines, wrapping lines, and cartoning equipment across European and North American packaging plants. The straight bore configuration allows rapid integration into existing drive shafts during line changeovers without the removal of taper lock bushings, which reduces downtime.

Conveyor and Material Handling Systems

Conveyor systems that handle products requiring precise timing — such as unit-load handling in distribution centers, product accumulation zones, or incline conveyors in mining and aggregate processing — use L-pitch timing belt drive systems where the position of the product must track exactly with the belt surface motion. The larger-bore Cast Iron straight bore timing pulley variants in the L100 series, with Di dimensions up to 342 mm on the 120-tooth model, suit the slow-speed, high-torque main drive applications found on heavy-duty conveyor head-drives in Australian mining operations and South American agricultural processing facilities.

Printing and Paper Handling Machinery

Printing presses, die-cutting machines, and paper folding lines use timing belt drives extensively to coordinate multiple shafts that must remain in precise phase relationship throughout the print cycle. The L-series pitch straight bore timing pulley provides the repeatable synchronization between the impression cylinder, ink rollers, and paper feed mechanism that makes consistent print registration possible at high speeds. Printing machinery manufacturers in Germany, Japan, and the United States frequently specify L100 straight bore timing pulley units for drive axis designs in commercial and industrial printing equipment.

Medical and Laboratory Equipment

Diagnostic imaging equipment, laboratory liquid handlers, and sample processing automation use small-bore steel straight bore timing pulley units in the 10 to 20 tooth range of the L100 series for the positioning axes of their scanning, pipetting, and sample transport mechanisms. The precision of the tooth geometry in a properly manufactured straight bore timing pulley ensures that the number of steps taken by a stepper motor or the encoder counts from a servo motor translate to precise linear displacement of the driven mechanism — a requirement for medical equipment accuracy under applicable regulatory frameworks such as FDA 21 CFR Part 820 in the United States and CE marking requirements in the European Union.

ANSI/RMA IP-24 — Inch Pitch Timing Belt Drives (USA)

The American National Standards Institute ANSI/RMA IP-24 standard defines the dimensional specifications for L-series timing belts and pulleys, including tooth form geometry, pitch measurement, and belt width tolerances. L-pitch straight bore timing pulley units conforming to this standard are dimensionally interchangeable with belts from any manufacturer who also certifies conformance to ANSI/RMA IP-24. This interchangeability is an important procurement advantage for buyers in North and South America managing replacement belt inventories for machines operating on L100 series straight bore timing pulley units.

ISO 5295 — Synchronous Belt Drive Systems

ISO 5295 specifies dimensions and tolerances for synchronous belt drive systems, covering pulley groove geometry and belt tooth profile. Products designed to ISO 5295 are recognized across European and Asian markets, providing the dimensional basis for engineering calculations of drive capacity, belt life, and shaft loads. European machinery manufacturers purchasing metric timing belt pulleys or L-series straight bore timing pulley units for equipment destined for export should verify ISO 5295 conformance to ensure belt sourcing flexibility in destination markets.

EU Machinery Directive 2006/42/EC

In the European Union, machinery incorporating timing belt drives must comply with the Machinery Directive. This requires that all power transmission components, including the straight bore timing pulley, be designed and installed so that belt or pulley failure does not create immediate hazard. Drive guards and belt tension monitoring provisions fall under this requirement. Suppliers of straight bore timing pulley units to European OEM machinery builders should provide appropriate documentation supporting CE marking, including material certificates and dimensional inspection records where specified in the customer's supplier qualification requirements.

GB/T Standards — Chinese National Standards for Synchronous Pulleys

Chinese national standards under the GB/T framework define tooth form geometry and material requirements for synchronous pulleys manufactured and sold in the Chinese domestic market. As a China timing pulley supplier producing L-series straight bore timing pulley products, our manufacturing process references applicable GB/T standards for material grade selection, heat treatment, and dimensional tolerance inspection, ensuring that products meet both domestic and export market quality requirements without parallel production systems for different destinations.

ICONTEC and NTC Standards — Colombia and Latin America

In Colombia and other Andean Community member states, power transmission components used in industrial machinery must comply with applicable ICONTEC NTC standards that align with ISO and ANSI references for belt drive systems. Buyers in Colombia, Peru, Chile, and Brazil sourcing L100 straight bore timing pulley units for locally manufactured automation and processing equipment should verify that the component's dimensional standard (ANSI/RMA or ISO) is recognized by the machine OEM's design documentation to ensure compatibility compliance.

FDA 21 CFR Part 820 — Medical Device Manufacturing (USA)

For custom timing belt pulleys used in FDA-regulated medical device manufacturing equipment — including the straight bore timing pulley in custom bore configurations — the supplier must be able to provide material traceability documentation, dimensional inspection records, and process control evidence consistent with the device manufacturer's supplier qualification requirements under 21 CFR Part 820. Buyers specifying L100 steel straight bore timing pulley units for medical laboratory or diagnostic equipment drives should clarify documentation requirements at the point of inquiry to avoid supply delays during OEM equipment qualification.

Metric Pitch Standard Toothed Bars

Metric Pitch Standard Toothed Bars are the linear-motion complement to rotary straight bore timing pulley units. When used together with the L100 straight bore timing pulley and a compatible timing belt, toothed bars create linear positioning drives that offer the same zero-slip synchronization as rotary timing belt drives — essential for CNC axis drives, conveyor indexing, and linear robot positioning systems. Our toothed bar series covers all major metric and inch pitches, including the L-pitch profile, for direct compatibility with L100 series pulleys and standard L-series belts.

V-Pulley

Our V-Pulley range is designed for use alongside straight bore timing pulley drives in machines that combine synchronous and non-synchronous belt drive sections. V-belt pulleys are commonly used for motor input stages where slip tolerance is acceptable, with the straight bore timing pulley handling the precision positioning downstream. Sourcing both straight bore timing pulley units and V-pulleys from a single supplier ensures consistent manufacturing quality standards, simplified logistics, and a single technical contact for drive system design support, reducing procurement complexity for global engineering teams.