► Finer | Sprockets 20B/24B/28B THRO BORE

For Reliable Industrial Power Transmission

Choosing the correct through bore sprocket is essential for achieving efficient, reliable power transmission across conveyors, production equipment, agricultural machinery, processing plants & heavy industrial applications. Unlike finished bore sprockets, through bore sprockets provide the flexibility to machine the centre bore, keyway & locking arrangement to suit your exact shaft requirements, making them a preferred solution for maintenance teams, OEMs, fabrication workshops & equipment manufacturers.

Industrial Shed supplies quality through bore sprockets engineered for dependable performance across Australian industries where durability, accurate chain engagement & long service life matter. When selecting a complete drive solution, it's also worth reviewing our range of Roller Chains – Standard, Heavy Duty to ensure both components work together as a matched drive system.

What Are Through Bore Sprockets?

A through bore sprocket is a chain sprocket manufactured with an unfinished centre bore that allows the installer or machine shop to machine the bore, keyway & locking arrangement to suit a specific shaft diameter. This flexibility makes them ideal where off-the-shelf finished bore or taper lock options aren't suitable.

Rather than adapting machinery to suit the sprocket, a through bore sprocket is adapted to suit the machinery.

They're commonly manufactured from high-quality carbon steel & designed to operate with ANSI & ISO roller chains across a wide range of industrial applications. Depending on the application, they may be used with simplex, duplex or triplex chains to transmit torque efficiently while maintaining accurate chain pitch & tooth engagement.

Through bore sprockets are commonly found in:

► Conveyor systems
► Agricultural machinery
► Packaging equipment
► Food processing plants
► Quarry & mining equipment
► Timber processing
► Recycling facilities
► Manufacturing production lines

Where faster installation or easier future replacement is required, many maintenance teams also consider Sprockets – Simplex, Duplex, Taper Lock, Idler, particularly when equipment downtime needs to be minimised.

Why Choose Through Bore Sprockets?

Through bore sprockets offer exceptional flexibility because they can be customised to match unique machinery rather than forcing machinery to match standard components.

For many industrial applications, this provides several practical advantages.

► Custom bore sizing for non-standard shafts
► Precise keyway machining
► Greater installation flexibility
► Reliable torque transmission
► Long service life
► Excellent compatibility with standard industrial roller chains
► Suitable for new machinery & replacement projects

Correct sprocket selection doesn't simply improve power transmission. It also helps reduce chain vibration, minimise premature bearing wear, improve drive efficiency & reduce long-term maintenance costs.

Selecting the correct shaft fit is equally important. Worn keys or incorrectly machined keyways can introduce movement that accelerates wear across the entire drive assembly. When inspecting a drive system, it's good practice to also inspect Keys & Keyways before fitting new components.

Common Applications

Through bore sprockets are used wherever dependable mechanical power transmission is required.

In manufacturing plants, they drive conveyor systems, production equipment & automated handling systems where consistent chain engagement is essential for maintaining throughput.

Within agriculture, they're commonly fitted to harvesters, grain handling systems, augers, irrigation equipment & feed processing machinery that operates under varying seasonal loads.

Mining & quarry operations rely on robust sprockets to power crushers, conveyors & material handling equipment exposed to dust, vibration & continuous operation.

Food processing facilities often use appropriately specified sprockets within packaging lines, wash-down systems & production conveyors where reliable operation helps minimise downtime.

Timber mills, recycling plants, wastewater facilities & bulk handling operations also depend on correctly specified sprockets to maintain smooth, efficient drive systems.

If you're maintaining heavy-duty conveying equipment, our guide on Quarry Crews Crusher Maintenance shares practical maintenance strategies for harsh operating environments.

Product Selection Guide

Choosing the correct through bore sprocket involves more than simply matching the chain size.

Several specifications influence long-term performance.

Before purchasing, confirm:

► Chain pitch
► ANSI or ISO chain standard
► Number of teeth
► Pitch diameter
► Outside diameter
► Bore diameter after machining
► Shaft diameter
► Keyway dimensions
► Hub style
► Required torque
► Operating speed
► Duty cycle
► Material specification
► Corrosion requirements
► Lubrication method

For high-load applications, replacing only the sprocket while leaving a worn chain in service often shortens the life of the new component. Replacing matched drive components together generally produces smoother operation & reduces long-term operating costs.

Many complete drive rebuilds also include inspection of Chain Tensioners & Guides & appropriate Drive Lubrication Systems to maximise service life.

If you're unsure which specifications best suit your equipment, our Trade support Solutions team can help identify suitable products before ordering.

Expert Tips

Experienced maintenance technicians know that sprocket life depends just as much on installation as product quality.

Good workshop practice includes:

► Replace worn chains & sprockets together
► Check shaft alignment during installation
► Inspect keyways for wear
► Maintain correct chain tension
► Lubricate according to operating conditions
► Inspect tooth profiles regularly
► Monitor chain elongation
► Replace damaged components before failure

One of the most common causes of premature sprocket wear isn't poor manufacturing—it's running an elongated chain on new sprockets. This accelerates tooth wear, increases vibration & reduces bearing life throughout the drive system.

For more workshop maintenance advice, read The Jobsite Doesn't Forgive. We Do. for practical strategies to keep industrial equipment operating reliably.