► Finer | Sprockets-05B-THROBORE

Precision British Standard Sprockets for Reliable Power Transmission

Reliable chain drive performance depends on more than selecting the right roller chain. The sprocket plays an equally important role in transferring torque, maintaining accurate chain engagement & supporting efficient power transmission. A worn, damaged or incorrectly specified sprocket can increase vibration, accelerate chain wear & reduce the operating life of the entire drive system.

Finer 05B Through Bore Sprockets are manufactured to British Standard (BS/ISO 606) dimensions for use with 05B simplex roller chain. Designed with a fully machined through bore, they provide the flexibility to machine the final shaft fitment, making them an excellent choice for OEM equipment, machinery upgrades, maintenance repairs & custom engineering applications.

Whether you're replacing an existing sprocket or designing a new chain drive, selecting compatible components helps improve reliability, reduce maintenance requirements & maximise drivetrain performance.

Compare your existing components with our Roller Chains – Standard & Heavy Duty collection or browse the complete Chains & Sprockets range to ensure every component within your drive system is correctly matched. Eligible stocked products may also qualify for Same Day Dispatch to help minimise downtime.

What Are Finer 05B Through Bore Sprockets?

Finer 05B Through Bore Sprockets are precision-manufactured British Standard sprockets designed to operate with 05B simplex roller chain. Their fully machined through bore allows engineers, maintenance workshops & machinery manufacturers to machine the final bore, keyway or shaft fitment to suit individual equipment requirements.

The designation 05B identifies the British Standard chain size, manufactured to internationally recognised ISO 606 dimensions with an 8 mm pitch. Matching the sprocket to the correct chain size is essential for smooth chain articulation, even load distribution & efficient power transmission. Using mismatched components can lead to poor engagement, increased vibration, accelerated wear & reduced drivetrain efficiency.

Unlike taper lock sprockets, which rely on interchangeable bushes, through bore sprockets offer greater flexibility where custom shaft diameters, keyways or mounting arrangements are required. They are widely used by OEM manufacturers, engineering workshops & maintenance teams building or refurbishing industrial equipment.

Many Finer sprockets feature induction-hardened teeth, increasing surface hardness while retaining a durable core. This helps improve wear resistance in high-cycle applications where thousands of chain engagements occur every hour. When paired with a compatible roller chain, accurate tooth geometry helps maintain smooth engagement & consistent load transfer throughout the drive system.

Typical features include:

► Manufactured to British Standard (ISO 606 compatible) dimensions
► Designed for 05B simplex roller chain
► Precision-machined tooth profiles
► Fully machined through bore
► Quality steel construction
► Induction-hardened teeth on selected models
► Accurate pitch circle geometry
► Smooth chain engagement

A sprocket performs best as part of a complete drive system. Chain condition, shaft alignment, lubrication, transmitted load, rotational speed & installation accuracy all influence long-term performance & operating life.

Why Choose Finer 05B Through Bore Sprockets?

Every chain drive depends on accurate interaction between the roller chain & sprocket teeth. As the chain enters & exits the sprocket, each roller must engage smoothly with the tooth profile to transfer torque efficiently. Precision manufacturing helps distribute load evenly across multiple teeth, reducing localised stress & promoting smoother operation.

Finer 05B Through Bore Sprockets are manufactured to tight dimensional tolerances, supporting accurate pitch engagement with British Standard roller chain. This helps minimise vibration, maintain efficient power transmission & reduce unnecessary wear throughout the drivetrain.

Key benefits include:

► Manufactured to British Standard dimensions
► Compatible with 05B simplex roller chain
► Precision-machined tooth profiles
► Quality steel construction
► Induction-hardened teeth on selected models
► Through bore for custom shaft machining
► Consistent pitch accuracy
► Smooth chain engagement
► Reliable industrial performance
► Suitable for OEM & maintenance applications

Replacing a worn sprocket is about more than restoring drive performance. As chains & sprockets wear together over time, the tooth profile gradually changes. Installing a new chain onto a heavily worn sprocket—or fitting a new sprocket to a severely elongated chain—can accelerate wear because the components no longer mesh as intended.

Inspecting both components during scheduled maintenance helps identify wear early, reduce unplanned downtime & support longer operating life across the complete chain drive.

Technical Specifications Checklist

Before You Order

Confirming these details before ordering helps avoid installation delays, unnecessary machining costs & compatibility issues.

Through Bore vs Pilot Bore vs Taper Lock Sprockets

Selecting the right mounting style is just as important as selecting the right chain size. Each sprocket type offers different advantages depending on the equipment design, maintenance strategy & installation requirements.

A through bore sprocket is well suited to applications requiring custom shaft machining or specialised fitments. Pilot bore sprockets provide maximum machining flexibility from an unfinished bore, while taper lock sprockets simplify installation through interchangeable bushes, making them popular where rapid maintenance is a priority.

Common Applications

Finer 05B Through Bore Sprockets are used across a broad range of industrial machinery where dependable mechanical power transmission is essential.

Typical applications include:

► Conveyor systems
► Packaging machinery
► Food & beverage processing equipment
► Agricultural machinery
► Printing equipment
► Textile machinery
► Automated production lines
► Materials handling equipment
► Timber processing machinery
► OEM machinery manufacture
► Engineering workshops
► General industrial machinery

Their adaptable through bore design makes them particularly suitable for custom-built machinery, refurbishment projects & specialised equipment where standard shaft configurations are unsuitable.

Understanding Tooth Count & Drive Performance

Tooth count directly influences speed, torque, chain articulation & the overall efficiency of a chain drive. Selecting the appropriate sprocket combination helps balance performance, operating life & mechanical efficiency.

Every time a chain engages a sprocket, each pin rotates within its bush. Smaller sprockets increase the articulation angle, causing greater movement between the pin & bush during every revolution. Over time, this additional articulation contributes to internal wear & chain elongation.

Larger sprockets generally provide:

► Reduced chain articulation
► Improved load distribution
► Smoother chain engagement
► Lower vibration
► Reduced pin & bush wear
► Longer operating life

Sprocket selection should always consider the complete drive system, including the driver sprocket, driven sprocket, transmission ratio, shaft centres, available space, operating speed, transmitted load & OEM recommendations. Looking at these factors together helps achieve reliable performance while reducing unnecessary wear.

Product Selection Guide

Selecting the right 05B through bore sprocket starts with identifying the complete drive system rather than simply matching the outside diameter.

Before ordering, confirm:

► British Standard chain designation (05B)
► Tooth count
► Bore dimensions
► Shaft diameter
► Keyway dimensions
► Hub configuration
► Required transmission ratio
► Operating speed
► Transmitted load
► Environmental conditions
► Lubrication method
► OEM specifications

Inspect the existing sprocket for hooked teeth, uneven wear, excessive polishing or signs of poor chain engagement. If wear is evident, inspect the matching chain for elongation before replacing individual components. Because chains & sprockets wear together, replacing both at the same time often provides the best long-term value & reliability.

As part of routine maintenance, also inspect related components including Drive Lubrication Systems, Chain Tensioners & Guides, Alignment Tools & your existing Roller Chains – Standard & Heavy Duty. Addressing wear across the complete drive system helps restore efficient power transmission, reduce repeat failures & maximise component life.

Expert Tips

Keeping a chain drive operating efficiently requires more than replacing worn parts as they fail. Regular inspection, correct installation & ongoing maintenance help extend component life, improve reliability & reduce unplanned downtime.

► Inspect sprocket teeth during every chain replacement. Hooked, pointed or unevenly worn teeth are a strong indication the sprocket has reached the end of its working life.
► Replace chains & sprockets as a matched set where wear is evident. Installing a new chain onto a worn sprocket, or vice versa, can accelerate wear because the components no longer mesh correctly.
► Maintain adequate lubrication. Roller chain lubrication reduces friction between pins, bushes & rollers while also minimising wear on the sprocket teeth. Always use a lubricant suited to the operating environment.
► Check shaft alignment. Even minor misalignment increases side loading on the chain & sprocket, leading to uneven wear, vibration & reduced drivetrain efficiency.
► Avoid excessive chain tension. Over-tensioning increases bearing loads, while insufficient tension can cause chain whip, poor tooth engagement & accelerated wear.
► Monitor operating conditions. Dust, moisture, abrasive materials, chemical exposure & temperature extremes all influence maintenance intervals. Equipment operating in harsh environments should be inspected more frequently.

A proactive maintenance schedule not only extends component life but also helps identify developing issues before they result in costly breakdowns.