► 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...

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.

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  • Sprocket Pilot Bore (Large) 1-1/4" (BS 20B-1) Simplex 14 Tooth | 20B-1-14PB
    Sprocket Pilot Bore (Large) 1-1/4" (BS 20B-1) Simplex 14 Tooth | 20B-1-14PB
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  • Sprocket Pilot Bore (Large) 1-1/4" (BS 20B-1) Simplex 9 Tooth | 20B-1-09PB
    Sprocket Pilot Bore (Large) 1-1/4" (BS 20B-1) Simplex 9 Tooth | 20B-1-09PB
    Sprocket Pilot Bore 20B-1-09TH BS 1-1/4" Pitch Simplex | 20B-1-09PB built for serious trade use. Reliable performance, zero fluff — fit for workshops across the Mornington Peninsula and beyond. Backed by Industrial Shed service and support.► Key Features‣ Trade-tough construction for daily use‣ Consistent...
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    $30.20
  • Sprocket Pilot Bore (Large) 1-1/4" (BS 20B-1) Simplex 10 Tooth | 20B-1-10PB
    Sprocket Pilot Bore (Large) 1-1/4" (BS 20B-1) Simplex 10 Tooth | 20B-1-10PB
    Sprocket Pilot Bore 20B-1-10TH BS 1-1/4" Pitch Simplex | 20B-1-10PB built for serious trade use. Reliable performance, zero fluff — fit for workshops across the Mornington Peninsula and beyond. Backed by Industrial Shed service and support.► Key Features‣ Trade-tough construction for daily use‣ Consistent...
    $35.26
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  • Sprocket Pilot Bore (Large) 1-1/4" (BS 20B-1) Simplex 12 Tooth | 20B-1-12PB
    Sprocket Pilot Bore (Large) 1-1/4" (BS 20B-1) Simplex 12 Tooth | 20B-1-12PB
    Sprocket Pilot Bore 20B-1-12TH BS 1-1/4" Pitch Simplex | 20B-1-12PB built for serious trade use. Reliable performance, zero fluff — fit for workshops across the Mornington Peninsula and beyond. Backed by Industrial Shed service and support.► Key Features‣ Trade-tough construction for daily use‣ Consistent...
    $50.08
    $50.08
  • Sprocket Pilot Bore (Large) 1-1/2" (BS 24B-2) Duplex 30 Tooth | 24B-2-30PB
    Sprocket Pilot Bore (Large) 1-1/2" (BS 24B-2) Duplex 30 Tooth | 24B-2-30PB
    Sprocket Pilot Bore 24B-2-30TH BS 1-1/2" Pitch Duplex | 24B-2-30PB built for serious trade use. Reliable performance, zero fluff — fit for workshops across the Mornington Peninsula and beyond. Backed by Industrial Shed service and support.► Key Features‣ Trade-tough construction for daily use‣ Consistent...
    $842.54
    $842.54

Why Buy From Industrial Shed?

Industrial Shed supplies industrial-grade power transmission components trusted by maintenance professionals, manufacturers, fabrication workshops, agricultural businesses & engineering companies throughout Australia.

When you buy from Industrial Shed, you benefit from:

► Quality products from trusted manufacturers
► Technical product guidance
► Australia-wide supply
► Trade-focused customer support
► Reliable after-sales assistance
► Competitive pricing across industrial brands

Many stocked products are eligible for our Same day dispatch, helping reduce downtime when replacement parts are needed quickly. For added confidence after purchase, our Warranty & parts Support service is available to assist with eligible products.

If you're interested in broader workshop maintenance strategies, our article A tool is not just a tool. It’s a promise. explores why investing in quality equipment & maintaining it correctly delivers better long-term value.

Keep Your Drive System Performing at Its Best

Whether you're replacing a single sprocket or upgrading an entire power transmission system, choosing the correct through bore sprocket helps improve reliability, reduce maintenance & maximise equipment performance. Industrial Shed offers quality components backed by practical trade knowledge, dependable service & Australia-wide support.

 Browse our range of through bore sprockets today & keep your machinery operating efficiently with Industrial Shed's trusted power transmission solutions.

Frequently Asked Questions

A through bore sprocket is supplied with an unfinished bore that can be machined to suit a specific shaft size, keyway & locking arrangement. A taper lock sprocket uses a removable taper bush for easier installation & replacement. The best option depends on your equipment, shaft configuration, maintenance preferences & future servicing requirements.

Match the sprocket to the chain pitch, chain standard, roller dimensions & application requirements. Using incompatible chain sizes can result in poor engagement, accelerated wear & reduced drive efficiency.

Yes. They're specifically designed for machining to suit the required bore diameter, keyway & locking method before installation.

In most industrial applications, yes. Installing a new sprocket with a heavily worn chain can significantly reduce the service life of the new component.

Most industrial through bore sprockets are manufactured from high-quality steel, although stainless steel & specialised materials may be available for corrosive or food-grade environments.

Common signs include hooked or pointed teeth, uneven wear, excessive chain movement, poor chain engagement, vibration, noise & visible damage to the tooth profile.

Brands

Finer Power Transmissions

Finer Power Transmissions

Solutions Built for Tradies: How Industrial Shed Powers Your Success

At Industrial Shed, we understand that reliable tools are the backbone of any successful project. That’s why we stock durable, high-performance equipment designed to handle tough jobs without breakdowns or delays. Trade professionals across the Mornington Peninsula and Melbourne trust our range for its dependability and long-lasting quality.

As an independent tool retailer, we take pride in offering only the most trusted brands to ensure you get the job done right the first time. Whether you need hand tools, power tools, or workshop essentials, our carefully curated selection guarantees reliability, so you can focus on your work with confidence.

Struggling to locate specialised tools for your trade? Industrial Shed has you covered. Our extensive range ensures trade professionals across the Mornington Peninsula and Melbourne have access to niche products without the hassle of searching multiple suppliers. From unique fasteners to specialty power tools, we make it simple to find exactly what you need.

As a local, independent tool retailer, we understand the challenges tradies face in sourcing specific equipment. Our team is here to provide expert advice and personalised support, ensuring you have the right tools for the job—every time.

At Industrial Shed, we know the trade industry inside out. As an independent tool shop based on the Mornington Peninsula, we are deeply familiar with the needs of local tradies and construction professionals. Our curated selection of tools is designed to meet the demands of both large-scale projects and everyday trade work.

Our team provides tailored advice and practical solutions to ensure you’re equipped with the right tools and equipment for every job. With years of experience serving Melbourne and Mornington Peninsula professionals, we are your trusted partner for all things trade.

At Industrial Shed, we simplify your workday by offering everything you need under one roof. From hand tools and power tools to fasteners, workwear, and safety gear, our one-stop shop helps trade professionals save valuable time. No more running between multiple suppliers—we have it all.

Serving the Mornington Peninsula and Melbourne regions, we take pride in making your tool shopping experience efficient and straightforward. As an independent retailer, we focus on delivering high-quality products with the service and support you can rely on.

Your safety is our priority at Industrial Shed. We stock a full range of durable workwear, safety equipment, and PPE to keep you and your team protected on-site. From hi-vis clothing to helmets and gloves, our collection is designed with the toughest conditions in mind.

Trade professionals on the Mornington Peninsula and in Melbourne trust us for reliable safety solutions. With expert advice and a commitment to quality, we make sure you have the gear you need to stay safe while getting the job done.

Demanding projects require tools you can trust. At Industrial Shed, our heavy-duty tools and equipment are built to handle the toughest challenges on any worksite. Whether it’s power tools, concrete tools, or lifting gear, we’ve got the equipment you need to perform.

Serving trade professionals across the Mornington Peninsula and Melbourne, we specialise in high-performance tools that stand up to wear and tear. As an independent tool retailer, we provide personalised service to ensure you have the strength and reliability to succeed.

At Industrial Shed, we believe that balancing cost and performance shouldn’t mean compromising on quality. Our range of high-performance tools is competitively priced to ensure Melbourne and Mornington Peninsula tradies stay within budget while using the best gear.

From hand tools to power tools, we stock trusted brands that deliver value and durability. As an independent retailer, we’re committed to providing trade professionals with reliable tools that won’t break the bank—or let you down.

At Industrial Shed, we understand the importance of reliable power on the job. Our range of generators and portable power solutions is designed to keep your tools and equipment running smoothly, no matter where you’re working.

From small repairs to large-scale projects across the Mornington Peninsula and Melbourne, our power solutions are trusted by trade professionals. As your local tool shop, we offer expert advice to ensure you’re equipped with the right tools for uninterrupted productivity.

Avoid costly project delays with Industrial Shed’s consistently stocked inventory. We ensure trade professionals across the Mornington Peninsula and Melbourne have quick access to the tools, fasteners, and supplies they need to get the job done on time.

As an independent retailer, we pride ourselves on being a reliable partner for tradies, offering high-quality products and personalised service. When you shop with us, you’ll never have to worry about supply shortages holding you back.

At Industrial Shed, we’re more than just a tool retailer—we’re your partner in productivity. Serving Melbourne and the Mornington Peninsula, we provide trade professionals with the trusted tools, advice, and support they need to succeed on every project.

Our independent approach ensures we prioritise your needs, from reliable product recommendations to tailored solutions. With our high-quality gear and expert service, you can count on us to help you work smarter and achieve more.