Description
What Is the 1775 Sprocket Idler Wheel?
The 1775 Sprocket Idler Wheel is a precision return-side component designed specifically for use with the 1775 series plastic modular belt system. Unlike a drive sprocket, the idler wheel carries no torque — its job is to guide the belt on the return run, maintain correct belt tension, and prevent lateral drift without adding load to the drive shaft. The result is quieter operation, reduced belt wear, and a measurably longer belt lifespan across demanding continuous-cycle environments.
Manufactured from engineering-grade acetal (POM) as standard, each wheel is CNC-machined to tight dimensional tolerances. The bore is available in 25, 30, 35, and 40 mm to suit standard shaft sizes found across UK conveyor systems. Four tooth-count variants — 16T, 19T, 20T, and 21T — allow engineers to match the idler geometry precisely to the belt pitch and conveyor width without compromise. Custom non-standard configurations are available on request directly from our technical sales team.
Technical Specifications
All dimensions in millimetres (mm). Bore options: 25 / 30 / 35 / 40 mm. Standard: Machining. Non-standard tooth counts available on request.
| Sprocket Type | Number of Teeth | Bore RB (mm) | Outside Diameter OD (mm) | Pitch Diameter PD (mm) | Standard |
|---|---|---|---|---|---|
| ROUND BORE (圆孔) | |||||
| 1775-16T-CD | 16 | 25 / 30 / 35 / 40 | 133.5 | 128.2 | Machining |
| 1775-19T-CD | 19 | 25 / 30 / 35 / 40 | 157.2 | 151.9 | |
| 1775-20T-CD | 20 | 25 / 30 / 35 / 40 | 165.0 | 159.8 | |
| 1775-21T-CD | 21 | 25 / 30 / 35 / 40 | 173.1 | 167.8 | |
* If a non-standard sprocket model is required, please contact our sales team directly at [email protected]
Material, Design Principle & How It Works
Acetal (POM) Construction
Each 1775 Sprocket Idler Wheel is machined from solid acetal copolymer (POM-C) stock. POM delivers a tensile strength of approximately 60–65 MPa, a flexural modulus around 2,600 MPa, and a continuous service temperature up to 90°C — well within the demands of UK food production and cold-chain logistics environments. Its inherent low coefficient of friction (approximately 0.2 against steel) means the wheel glides over the return rail without additional lubrication, reducing maintenance cycles substantially.
CNC-Machined Tooth Profile
The tooth profile is CNC-machined to match the 1775 belt’s hinge geometry precisely, with an overall face width of 44 mm and a hub depth of 29 mm. This controlled engagement distributes load evenly across the full belt width rather than concentrating stress at the hinge pin, which is a common failure point in older conveyor designs. The round bore design simplifies shaft installation: a standard parallel shaft, a retaining pin or key, and the wheel seats correctly in minutes rather than hours.
Return-Side Function
On the return run of any modular belt conveyor, the belt must track cleanly back to the drive end without sagging, twisting, or sideflexing uncontrolled. The 1775 Sprocket Idler Wheel solves this by providing a positive, toothed engagement with the belt’s hinge rod pockets on the underside. Unlike plain idler rollers, the toothed profile prevents belt skip under load fluctuations — a particularly important characteristic in UK poultry processing lines, biscuit oven outfeed conveyors, and ambient parcel sortation systems where belt loads change rapidly during peak throughput.
Why UK Engineers Specify the 1775 Idler Wheel
Benefit 01
Extended Belt Life
Positive tooth engagement prevents micro-slip, reducing hinge-pin wear by an estimated 30–40% versus plain roller idlers in comparable applications.
Benefit 02
Lubrication-Free
POM-C self-lubricates, eliminating the need for grease or oil on the return shaft — critical for UK food-grade and pharmaceutical conveyor applications.
Benefit 03
Corrosion Resistance
Acetal resists dilute acids, cleaning chemicals, and washdown water — making these wheels suitable for CIP (clean-in-place) conveyor systems common in UK dairy and bakery plants.
Benefit 04
Multiple Bore Options
Four bore sizes (25, 30, 35, 40 mm) mean the wheel fits directly to existing shaft infrastructure without costly bespoke adapters — important when retrofitting older UK conveyor frames.
Benefit 05
Low Noise Operation
The plastic-on-plastic belt engagement produces significantly less structure-borne noise than steel sprockets against steel chains, supporting workplace noise compliance under UK COSHH and HSE guidelines.
Benefit 06
Fast Interchangeability
Standard round bore with machined finish ensures these wheels swap in for worn components in planned maintenance windows, keeping conveyor downtime within the planned maintenance window and preventing costly unscheduled stoppages.
Typical Application Scenarios in the UK
The 1775 Sprocket Idler Wheel finds application wherever a 1775 series plastic modular belt is used on a return-side support shaft. In practice, that covers a broad range of UK industries. In food processing — particularly poultry, fish, and bakery — the wheel’s hygienic plastic construction and washdown resistance make it a default specification. In logistics and e-commerce fulfilment centres, which have expanded substantially across the UK Midlands and South East over the past decade, these wheels support high-speed sortation conveyors running 16 to 24 hours per day, where any unplanned stoppage translates directly to missed shipment windows and penalty costs.
Pharmaceutical packaging lines in the UK — particularly those operating under MHRA GMP requirements — benefit from the chemical compatibility of POM-C with IPA-based sanitisers and the absence of any steel components that might shed rust particles into the product zone. Agricultural produce handling, cold-store distribution, and automotive parts washing lines round out the common deployment environments.
Logistics & Fulfilment
Pharmaceutical Packaging
Bakery & Dairy
Cold-Chain Distribution
Automotive Parts Washing
Customer Success
Real results from UK and European operations using the 1775 Sprocket Idler Wheel.
Case Study · UK Food Processing
Lancashire Poultry Processor Cuts Unplanned Downtime by 38%
A mid-sized poultry processing facility in Lancashire operating six evisceration lines had been experiencing return-belt tracking failures approximately every 11 weeks. The root cause was identified as plain steel idler rollers losing positive engagement with the 1775 series belt under wet, high-throughput conditions — the belt would drift laterally and trip the edge detector sensors, halting the line. The maintenance team replaced all return-side idlers with 1775-20T-CD Sprocket Idler Wheels (35 mm bore) across all six lines during a planned weekend shutdown.
Over the following 10 months, belt tracking faults fell to zero on four of the six lines, and were reduced from 5 per line to 1 on the remaining two. Overall unplanned conveyor downtime attributable to belt tracking dropped by 38%, and the annual spend on replacement hinge rods and lateral guide strips fell by an estimated 22%. The facility has since standardised the 1775 Sprocket Idler Wheel as its specification for all new conveyor builds.
“We specified the 1775 Sprocket Idler Wheel on our new chilled distribution line build in Northampton. The installation was straightforward, and 14 months later we have had no return-belt related stoppages whatsoever. The POM material holds up perfectly to our weekly chemical washdown.”
— Conveyor Systems Engineer, UK Chilled Logistics Provider, East Midlands
“Our biscuit oven outfeed runs at elevated temperature and we needed an idler that wouldn’t warp or require lubrication in a food zone. The 1775-19T-CD has been running continuously for over a year with zero maintenance calls. Competitive price, fast lead time — exactly what we needed.”
— Maintenance Manager, Bakery Equipment OEM, West Yorkshire
“As a conveyor integrator working across pharmaceutical clients in the UK, we need components we can specify with confidence. The 1775 Sprocket Idler Wheel gives us the right bore options, chemical compatibility certificates on request, and the dimensional accuracy we require for validated systems.”
— Projects Director, Conveyor Integration Company, Cambridgeshire
Manufacturing Capability & Custom Orders
Our manufacturing facility operates a dedicated CNC machining centre with 5-axis capability, purpose-configured for plastic conveyor components. All 1775 Sprocket Idler Wheels leave the factory having been dimensionally inspected against a master gauge set to confirm bore diameter, tooth profile, pitch diameter, and face width. This in-process quality control is what gives UK engineers the confidence to specify our components into validated production lines without incoming inspection delays.
Beyond the four standard round-bore configurations, we offer a full product customisation service. Non-standard tooth counts, keyway bores, flanged hubs, alternative polymer materials (UHMW-PE, nylon PA6, PEEK for high-temperature applications), and special bore diameters outside the 25–40 mm range are all available with typical lead times of 10–20 working days from drawing approval. Customers are encouraged to supply shaft drawings or conveyor general arrangement drawings, from which our applications engineers will specify the correct idler geometry and provide a detailed technical proposal at no cost.
Custom specification?
Send your shaft drawing or conveyor GA to our applications team. We respond with a technical proposal within 2 working days.
Complete Your 1775 Belt System
The 1775 Sprocket Idler Wheel is designed to work within a complete 1775 series conveyor ecosystem. Two related components are worth specifying at the same time to ensure full system compatibility and avoid mixed-pitch issues:
Drive Component
1775 Sprocket Drive Wheel
The power-transmitting counterpart to the idler wheel. Keyed to the drive shaft, it positively drives the 1775 belt at the head end of the conveyor. Specify alongside the idler wheel to ensure matched tooth geometry, consistent belt pitch engagement, and balanced conveyor design.
Belt Component
1775 Gapless Sideflex Run Single Hinge Chain
The primary belt module for curved conveyor runs. The gapless design prevents product fingers or labels catching in belt gaps during transfers, while the single-hinge construction reduces belt weight and simplifies cleaning. Pairs directly with the 1775 Sprocket Idler Wheel on the return run.
Frequently Asked Questions
Ready to Specify the 1775 Sprocket Idler Wheel?
Send your shaft specification, conveyor layout, or enquiry to our applications team. We respond within 2 working days with a technical proposal and competitive price.
plastic-modular-belt.com · [email protected] · edit by gzl
