Description
820 Chain Wheel – Driving Sprocket & Idler Wheel
Precision-engineered plastic modular belt sprockets for food processing, packaging, and material handling — trusted by UK manufacturers and global OEMs alike.
The 820 Chain Wheel — available as both a Driving Sprocket and an Idler Wheel — is a cornerstone component in plastic modular conveyor belt systems. Designed to mesh seamlessly with 820-series modular belts, these sprockets deliver precise, low-noise power transmission across a wide range of industrial applications. Whether you are operating high-throughput food-grade lines in Yorkshire or automated packaging facilities in the Midlands, the 820 series offers the mechanical reliability and dimensional accuracy your operation demands. The tooth geometry is engineered to minimise belt wear and reduce chain articulation stress, translating into longer service intervals and lower total cost of ownership for UK procurement teams sourcing replacement conveyor parts.
Why UK Procurement Engineers Choose the 820 Sprocket
From food-grade hygiene compliance to heavy-duty throughput, this sprocket range covers the full spectrum.
Precision Tooth Form
CNC-machined or injection-moulded tooth profiles ensure consistent belt engagement, reducing lateral drift and premature wear even at high conveyor speeds.
Food-Grade Materials
Manufactured from FDA-compliant engineering polymers, the 820 sprocket is safe for direct and indirect food contact, meeting hygiene standards demanded across British food processing facilities.
Multiple Bore Options
With bore sizes of 25 mm, 30 mm, 35 mm, and 40 mm available across all tooth variants, retrofitting to existing shafts is straightforward — no custom machining required on site.
Drive & Idler Variants
The range includes dedicated Driving Sprocket and Idler Wheel configurations, allowing complete system assembly from a single supplier and simplifying your procurement and spares inventory.
Technical Specifications
All dimensions in millimetres (mm). For non-standard models, please contact our sales team directly.
| Sprocket Type | Number of Teeth | Bore (RB) mm | Out Side Diameter (OD) mm | Pitch Diameter (PD) mm | Standard |
|---|---|---|---|---|---|
| Round Bore | |||||
| 820-19T-CD | 19 | 25 / 30 / 35 / 40 | 117 | 117.3 | Machining / Injection |
| 820-21T-CD | 21 | 25 / 30 / 35 / 40 | 130 | 129.3 | |
| 820-23T-CD | 23 | 25 / 30 / 35 / 40 | 141.9 | 141.2 | |
| 820-25T-CD | 25 | 25 / 30 / 35 / 40 | 154.2 | 153.2 | |
* If the sprocket requires a non-standard model, please contact the salesperson directly.
How It Works — Principle, Material & Application
Working Principle
The 820 Chain Wheel operates on a positive-drive principle. The sprocket teeth interlock with the drive rods of the modular plastic belt, converting rotational shaft energy into linear belt motion. The Driving Sprocket is connected directly to the motor shaft and provides the primary motive force. The Idler Wheel, positioned at the return end of the conveyor, maintains belt tension and ensures smooth tracking without load-driving responsibility. Together, these two components define the belt’s travel path and guarantee consistent throughput across the full width of the conveyor frame — a critical requirement in high-speed sorting and accumulation systems commonly found across UK logistics and food processing operations.
Material Composition
820 sprockets are produced from high-performance engineering thermoplastics — primarily acetal (POM) and polyamide (nylon PA6/PA66) — which deliver outstanding strength-to-weight ratios, self-lubricating surfaces, and excellent resistance to moisture, cleaning chemicals, and mild acids. Unlike steel alternatives, plastic sprockets are corrosion-free, significantly lighter, and dramatically quieter during operation. For extreme duty cycles, glass-fibre-reinforced variants are available upon request, offering superior dimensional stability under cyclic load conditions. All materials conform to EU food-contact regulations and RoHS directives.
Industry Applications
The 820 sprocket is widely deployed across sectors where hygienic, reliable conveying is non-negotiable. In UK meat-processing plants, it handles wet, high-pressure washdown environments without corroding. Bakeries use it for dough and biscuit lines where oil contamination from metal sprockets would be a contamination risk. Automotive component manufacturers in the West Midlands rely on it for precise part orientation in assembly conveyors. Beverage bottling lines, pharmaceutical blister-pack systems, and e-commerce parcel sortation hubs across Britain all benefit from the low-maintenance, high-uptime performance of the 820 chain wheel.
Compatible System Components
Complete your conveyor build with matched sprocket accessories from our 1775 series, designed for seamless interoperability.
🔧 1775 Sprocket Drive Wheel
A high-torque driving sprocket designed for the 1775 belt series, ideal for heavy-load applications requiring robust belt engagement and minimal shaft deflection.
⚙️ 1775 Sprocket Idler Wheel
The return-end companion to the 1775 Drive Wheel, maintaining belt tension and alignment with low rolling resistance across wide-width conveyor installations.
Customer Success: Real-World Results
Proven performance across UK and European industrial operations.
🇬🇧 UK Poultry Processing — West Yorkshire
A large-scale poultry processing facility in Wakefield was experiencing unacceptable downtime caused by corrosion on their steel sprockets, which were failing within 6–8 months under continuous washdown cycles using caustic cleaning agents. After switching to our 820-23T-CD sprockets — selected specifically for the 35 mm bore to match their existing driveshafts — the facility has now operated for over 26 months without a single sprocket replacement. Estimated annual maintenance savings exceeded £18,000 per production line, and the engineering team reported a measurable reduction in belt noise during night-shift operations. The procurement manager noted the ease of ordering non-standard bore variants as a decisive advantage over their previous domestic supplier.
“We source the 820-19T-CD for our biscuit line in Manchester. The injection-moulded option arrived dimensionally perfect — no additional fitting required. Lead times are consistent and the quality is noticeably better than our previous European supplier.”
— Head of Engineering, Manchester Bakery Group
“Our pharmaceutical packaging line runs 24/7. We’ve been running 820-21T-CD idler wheels for 18 months. Zero failures, no belt tracking issues, and our maintenance team is very pleased with the simplified bolt-in replacement process.”
— Production Director, MedPack Solutions, Stevenage, UK
“As a conveyor OEM based in the Netherlands supplying UK fulfilment centres, we stock the full 820 sprocket range. Our clients in the logistics sector have specifically requested these by name after seeing them in competitor installations.”
— Sales Director, ConveyTech BV, Rotterdam (UK market supplier)
Factory Capabilities & Custom Sprocket Solutions
Behind every 820 Chain Wheel is a vertically integrated manufacturing operation with over 18 years of specialised experience.
Our production facility operates a complete in-house capability from raw polymer compounding through to precision CNC machining and injection moulding — all under one roof. This vertical integration means we can offer bespoke tooth profiles, non-standard bore diameters, custom flange widths, and proprietary hub keyway configurations to meet exacting OEM requirements. For UK buyers working to BS EN standards or dealing with legacy conveyor frames, our engineering team provides full DXF/STEP drawing review and tolerance matching as a standard pre-production service, at no additional cost. All outgoing components are inspected against first-article dimensional reports, and batch traceability is maintained throughout the production run. Minimum order quantities are kept deliberately low to support maintenance and spare-parts buyers as well as volume OEM customers. Whether you need 5 units for a line upgrade or 5,000 units for a new build, our production scheduling accommodates both with the same delivery commitment.
Frequently Asked Questions
Answers to the questions UK buyers ask most often about the 820 sprocket series.
Ready to upgrade your conveyor system with 820 Chain Wheel sprockets?
✉ Contact Us: [email protected]
Plastic Modular Belt — UK B2B Industrial Conveyor Specialists · edit by gzl
