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Ever Power · Precision Power Transmission · United Kingdom
085B-1 Sprockets — 1/2″ × 1/4″ Roller Chain Sprocket
For Chain Acc. to DIN 8187 • ISO/R 606 • Pitch 12.7 mm • Roller Φ 7.75 mm • Material: C 45 Carbon Steel
The 085B-1 sprocket is a precision-engineered roller chain sprocket manufactured to DIN 8187 and ISO/R 606 standards, serving as a dependable foundation for medium-duty power transmission across UK manufacturing, food processing, agricultural machinery, and automated conveyor systems. Produced from high-grade C 45 carbon steel with a correctly profiled tooth geometry, a 12.7 mm pitch, and a roller diameter of 7.75 mm, these sprockets deliver consistent tooth engagement, predictable wear rates, and extended service life under continuous industrial duty cycles. Available in SIMPLEX configurations spanning Z8 through to Z125, the 085B-1 series addresses the full spectrum of transmission ratios that British design engineers routinely specify, providing a reliable single-source solution for chain drive projects of every scale.
✉ Get a Quote — 085B-1 Sprockets
Rapid response • Custom bore & weld-on hub configurations • UK technical support team
Why the 085B-1 Sprocket Is a UK Engineering Benchmark
The 085B-1 sprocket occupies a well-established position in British mechanical engineering specifications not by accident but by sustained performance across decades of industrial service. The 1/2″ (12.7 mm) pitch represents a practical equilibrium in the medium-duty drive space: strong enough to transfer meaningful torque, compact enough to integrate with existing machine frames, and standardised against DIN 8187 and ISO/R 606 so that every critical dimension — tooth profile, pitch circle diameter, roller clearance — is fully defined and interchangeable with other compliant components. For UK plant engineers maintaining legacy equipment, this international alignment removes uncertainty from the replacement process entirely.
The choice of C 45 carbon steel throughout the 085B-1 range reflects a deliberate materials philosophy. This grade offers a proven balance of tensile strength, fatigue resistance, and machinability that has been validated across countless UK installations in food processing, packaging, and general manufacturing. Its hardness profile under heat treatment sustains acceptable tooth wear rates even in high-cycle applications, and its responsiveness to machining allows custom bore, keyway, and set-screw modifications to be carried out without introducing residual stress that might compromise tooth root integrity. For OEM builders in the East Midlands, the West Midlands, and across Yorkshire who routinely need non-standard bore dimensions, this is a material that genuinely enables customisation.
The optional weld-on hub configuration gives machinery builders an additional degree of mounting freedom that is particularly valuable when retrofitting sprockets into tight drive arrangements or when the shaft configuration departs from industry-standard diameters. Combined with the extraordinarily wide tooth-count range — from Z8 at a pitch circle diameter of approximately 38 mm through to Z125 at over 511 mm — the 085B-1 family gives procurement engineers the flexibility to source every sprocket in a multi-stage drive from a single product line. That consolidation reduces supplier count, shortens approval processes, and simplifies stock management at British manufacturing sites where inventory efficiency is under constant scrutiny.
Technical Specifications
SPROCKETS — mm
| Parameter | Value |
|---|---|
| Tooth radius r₃ | 13 mm |
| Radius width C | 1.3 mm |
| Tooth width B₁ | 5.9 mm |
CHAIN — mm
| Parameter | Value |
|---|---|
| Pitch | 12.7 mm |
| Internal width | 6.4 mm |
| Roller Φ | 7.75 mm |
Material: C 45 Hub: *Weld-on hub available
SIMPLEX Dimensional Table — Z8 to Z125 (all dimensions in mm)
| Z | dₑ | dᵖ | SIMPLEX | ||
|---|---|---|---|---|---|
| dₘ | D₁ | A | |||
| 8 | 38.5 | 33.18 | 20 | 10 | 25 |
| 9 | 41.5 | 37.13 | 24 | 10 | 25 |
| 10 | 46.2 | 41.10 | 26 | 10 | 25 |
| 11 | 49.6 | 45.07 | 29 | 10 | 25 |
| 12 | 53.9 | 49.07 | 33 | 10 | 28 |
| 13 | 58.4 | 53.06 | 37 | 10 | 28 |
| 14 | 62.8 | 57.07 | 41 | 10 | 28 |
| 15 | 66.8 | 61.09 | 45 | 10 | 28 |
| 16 | 70.9 | 65.10 | 50 | 12 | 28 |
| 17 | 74.9 | 69.11 | 52 | 12 | 28 |
| 18 | 78.9 | 73.14 | 56 | 12 | 28 |
| 19 | 82.9 | 77.16 | 60 | 12 | 28 |
| 20 | 86.9 | 81.19 | 64 | 12 | 28 |
| 21 | 91.0 | 85.22 | 68 | 14 | 28 |
| 22 | 95.0 | 89.24 | 70 | 14 | 28 |
| 23 | 99.0 | 93.27 | 70 | 14 | 28 |
| 24 | 103.0 | 97.29 | 70 | 14 | 28 |
| 25 | 107.1 | 101.33 | 70 | 14 | 28 |
| 26 | 111.0 | 105.36 | 70 | 16 | 30 |
| 27 | 115.4 | 109.40 | 70 | 16 | 30 |
| 28 | 119.4 | 113.42 | 70 | 16 | 30 |
| 29 | 123.4 | 117.46 | 80 | 16 | 30 |
| 30 | 127.4 | 121.50 | 80 | 16 | 30 |
| 31 | 131.5 | 125.54 | 90 | 16 | 30 |
| 32 | 135.5 | 129.56 | 90 | 16 | 30 |
| 33 | 139.6 | 133.60 | 90 | 16 | 30 |
| 34 | 143.6 | 137.64 | 90 | 16 | 30 |
| 35 | 147.6 | 141.68 | 90 | 16 | 30 |
| 36 | 151.7 | 145.72 | 90 | 16 | 30 |
| 37 | 155.7 | 149.76 | 90 | 16 | 35 |
| 38 | 159.8 | 153.80 | 90 | 16 | 35 |
| 39 | 163.8 | 157.83 | 90 | 16 | 35 |
| 40 | 167.8 | 161.87 | 90 | 16 | 35 |
| 41 | 171.4 | 165.91 | 90 | 16 | 40 |
| 42 | 175.4 | 169.95 | 90 | 16 | 40 |
| 43 | 179.5 | 173.99 | 90 | 16 | 40 |
| 44 | 183.5 | 178.03 | 90 | 16 | 40 |
| 45 | 187.5 | 182.07 | 90 | 16 | 40 |
| 46 | 191.6 | 186.10 | 90 | 16 | 40 |
| 47 | 195.6 | 190.14 | 90 | 16 | 40 |
| 48 | 199.7 | 194.18 | 90 | 16 | 40 |
| 49 | 203.7 | 198.22 | *90 | 16 | 40 |
| 50 | 207.8 | 202.26 | *90 | 16 | 40 |
| 51 | 211.8 | 206.30 | *90 | 16 | 40 |
| 52 | 215.9 | 210.34 | *90 | 16 | 40 |
| 53 | 219.9 | 214.37 | *90 | 16 | 40 |
| 54 | 224.0 | 218.43 | *90 | 16 | 40 |
| 55 | 228.0 | 222.46 | *90 | 16 | 40 |
| 56 | 232.1 | 226.50 | *90 | 16 | 40 |
| 57 | 236.1 | 230.54 | *90 | 16 | 40 |
| 58 | 240.2 | 234.58 | *90 | 16 | 40 |
| 59 | 244.2 | 238.62 | *90 | 16 | 40 |
| 60 | 248.2 | 242.66 | *90 | 16 | 40 |
| 62 | 256.7 | 250.75 | *90 | 16 | 40 |
| 64 | 264.8 | 258.82 | *90 | 16 | 40 |
| 66 | 272.9 | 266.90 | *90 | 16 | 40 |
| 68 | 280.9 | 274.99 | *90 | 16 | 40 |
| 70 | 289.0 | 283.07 | *90 | 16 | 40 |
| 72 | 297.1 | 291.16 | *90 | 16 | 40 |
| 78 | 321.4 | 315.40 | *90 | 16 | 40 |
| 80 | 329.4 | 323.48 | *90 | 16 | 40 |
| 90 | 369.9 | 363.90 | *90 | 16 | 40 |
| 95 | 390.1 | 384.10 | *90 | 16 | 40 |
| 100 | 410.3 | 404.31 | *90 | 16 | 40 |
| 110 | 450.7 | 444.74 | *90 | 16 | 40 |
| 114 | 460.9 | 460.90 | *90 | 16 | 40 |
| 120 | 491.2 | 485.16 | *90 | 16 | 40 |
| 125 | 511.4 | 505.37 | *90 | 16 | 40 |
* Weld-on hub configuration applicable. All dimensions in millimetres. dₑ = tip diameter; dᵖ = pitch circle diameter; dₘ = bore diameter; D₁ = hub outer diameter; A = hub width.
Key Performance Advantages
⚙
DIN 8187 / ISO/R 606 Compliance
Full dimensional conformance to internationally accepted standards eliminates compatibility uncertainties when integrating 085B-1 sprockets with DIN-compliant chains and machinery components already in service across UK plants. Interchangeability is guaranteed from day one.
🔨
C 45 Carbon Steel Construction
C 45 medium-carbon steel delivers the hardness and fatigue resistance demanded by continuous duty cycles in food production, packaging, and automation environments. Heat-treatable to further extend tooth surface life without affecting bore machinability or hub integrity.
📈
Z8 to Z125 Range in One Series
A tooth count span from 8 to 125 teeth within a single product family covers virtually every transmission ratio a design engineer is likely to encounter. Sourcing all sprockets in a multi-stage drive from one consistent range simplifies procurement, quality management, and spares logistics.
🔧
Weld-on Hub Flexibility
The available weld-on hub option extends mounting versatility significantly, accommodating shaft diameters and configurations that fall outside standard bore ranges. This is particularly relevant for British OEM builders designing bespoke automation platforms where standard bore sizes are rarely encountered.
✅
Precise Tooth Profile Geometry
Tooth radius r₃ = 13 mm, radius width C = 1.3 mm, and tooth width B₁ = 5.9 mm are machined to tight tolerances, ensuring the roller seating is consistent across every unit. Smooth chain engagement reduces dynamic loading, vibration, and noise in sensitive applications such as pharmaceutical conveyors and inspection systems.
🌎
Ready for UK & Global Supply
Ever Power maintains structured inventory and short lead times for the UK market. Whether you operate a single facility in the West Midlands or manage procurement for a multi-site group across England, Scotland, and Wales, consistent availability and reliable documentation support smooth incoming inspection and on-time production schedules.
Where 085B-1 Sprockets Are Used Across British Industry
The 085B-1 sprocket finds consistent use wherever a 12.7 mm pitch chain drive is called for, and that covers a substantial portion of the medium-duty drive market in the United Kingdom. In food and beverage processing facilities — from the large-scale dairy operations of Cheshire to the ready-meal production lines of the Thames Valley — this sprocket series handles washdown-tolerant conveyor drives where dimensional consistency directly affects hygiene and throughput. Packaging machinery builders operating from manufacturing hubs in the East Midlands and Yorkshire specify the 085B-1 range for its predictable engagement characteristics under variable-speed servo drives, where tooth geometry and pitch accuracy have a measurable impact on positional repeatability.
Agricultural equipment manufacturers across East Anglia and Lincolnshire rely on 085B-1 sprockets for harvester drives, seed metering systems, and grain handling conveyors where seasonal demand peaks require rapid parts availability. The combination of C 45 steel durability and a broad tooth count range means that both low-speed high-load drives and high-speed light-load applications within the same machine can be sourced from a single supplier relationship.
In general material handling, warehousing automation, and machine tool applications — sectors that have seen significant capital investment across northern English cities and in the M4 corridor — the 085B-1 sprocket continues to appear in chain drive specifications because its dimensions are reliable, its availability is consistent, and its performance under standard duty cycles is well-established through decades of documented field service.
Customer Success Case
Case Study — UK Food Processing Sector
Midlands Ready-Meal Producer Reduces Conveyor Downtime by 34%
A well-established ready-meal manufacturer based in Northamptonshire was experiencing frequent unscheduled stops on its primary portioning and sealing conveyor lines. The root cause, identified during a drive train audit, was inconsistent tooth geometry on the sprockets then in service — a product sourced from a European distributor whose quality control had deteriorated following a change in manufacturing partner. Chain engagement noise, accelerated roller wear, and occasional jamming during peak production shifts were costing the facility approximately 1.8 hours of unplanned downtime per week across three conveyor zones.
The engineering team contacted Ever Power seeking a direct-replacement 085B-1 sprocket supply that could be verified against DIN 8187 dimensional data before installation. Ever Power supplied a full set of dimensional certificates alongside the physical components, allowing the maintenance team to validate each batch without relying solely on supplier declarations. The transition to Ever Power’s 085B-1 units — carried out during a scheduled weekend shutdown — was completed without modification to the existing chain or drive arrangement.
Result: Conveyor unplanned downtime dropped by 34% in the 12 weeks following installation. Chain replacement intervals extended from 8 weeks to 14 weeks. Maintenance labour cost savings were calculated at approximately £4,200 per quarter across the three affected lines.
What UK Customers Say
“We’ve sourced 085B-1 sprockets from Ever Power for our Yorkshire bottling facility for three years. The dimensional consistency batch to batch is genuinely impressive — our maintenance team hasn’t had a single chain skip since we switched. Lead times are short and the technical documentation supports our ISO compliance audits without any additional work on our end.”
— Operations Manager, Beverage Manufacturer, West Yorkshire, UK
“As an OEM building bespoke agricultural handling equipment in Lincolnshire, we need sprocket suppliers who can respond quickly to custom bore requests. Ever Power accommodated a non-standard bore on 085B-1 units within a competitive lead time and the weld-on hub option saved us a significant machining step in production. The quality of the C 45 steel is consistent and the units arrive with proper dimensional records.”
— Technical Director, Agricultural Machinery OEM, Lincolnshire, UK
“Our packaging automation division switched to Ever Power’s 085B-1 sprockets after encountering tolerance issues with a previous supply. The difference in tooth profile accuracy is measurable on our coordinate measuring machine — it’s not just a claim. Chain engagement is quieter, indexing accuracy has improved on our servo-driven units, and we’ve had zero warranty claims on the drive components since the switch.”
— Mechanical Engineering Lead, Packaging Systems Integrator, East Midlands, UK
Manufacturing Capability & Custom Sprocket Services
Ever Power’s manufacturing operation is built around precision machining of power transmission components, and the 085B-1 sprocket range reflects that broader capability. Where standard catalogue dimensions cover most applications, a meaningful share of UK industrial demand involves configurations that require modification: custom bore diameters to suit non-standard shaft sizes, specific keyway geometries, set-screw positions dictated by existing machine envelopes, or weld-on hub specifications driven by OEM assembly requirements. Ever Power handles all of these. The in-house machining centre works to customer-supplied drawings or collaborates with buyers’ engineering teams to develop the correct specification before cutting begins.
Beyond single-item customisation, Ever Power supports customers who need a complete drive sprocket assembly supplied ready for direct fitment — including matched chain, pillow block bearings, and tension hardware — reducing the assembly burden on UK production teams and compressing project timelines. This turnkey supply model is particularly valued by British machine builders working to tight delivery schedules where sourcing individual components from multiple distributors introduces schedule risk.
All custom 085B-1 configurations are subject to the same dimensional verification process applied to standard stock, and documentation packages are available on request to support incoming quality inspection under BS EN ISO 9001 frameworks common across UK industrial procurement. Sample orders for approval are welcome, and volumes from single-piece prototypes through to full production batches are handled with equal attention.
Frequently Asked Questions
085B-1 Sprockets — UK Buyer Guide
What is the correct 085B-1 sprocket tooth count to choose when designing a conveyor chain drive for a UK food processing plant?
The tooth count selection depends on the required transmission ratio, the available centre distance, and the desired chain speed. For food processing conveyors, tooth counts between Z17 and Z25 on the driven sprocket are common in medium-speed applications because they produce a polygon effect low enough to avoid vibration issues on hygienic conveyors. Pairing a Z19 driver with a Z38 driven sprocket, for example, gives a 2:1 reduction using standard 085B-1 SIMPLEX units with a pitch circle diameter of approximately 82.9 mm and 159.8 mm respectively. If you share your drive parameters with the Ever Power technical team, a sprocket selection recommendation can be provided with full dimensional confirmation.
Where can I find a reliable UK supplier of DIN 8187 compliant 085B-1 sprockets for industrial machinery in England?
Ever Power supplies DIN 8187 and ISO/R 606 compliant 085B-1 sprockets to industrial buyers across England, Scotland, and Wales. Orders are handled directly through the sales team, documentation including dimensional certificates is available on request, and custom bore or weld-on hub configurations can be specified at the point of enquiry. Contact the team via [email protected] for availability and lead time information relevant to your specific application.
How much does it typically cost to order custom-bore 085B-1 sprockets from a UK industrial sprocket supplier, and what affects the price?
The price of custom-bore 085B-1 sprockets depends on the specific tooth count (Z), bore diameter, keyway geometry, required quantity, and whether a weld-on hub is specified. Standard tooth counts with common bore sizes typically attract the lowest unit cost, while non-standard configurations involve a machining premium that scales with complexity rather than with part size. Quantities above a defined minimum order threshold often reduce per-unit cost substantially. For an accurate quote reflecting your exact specification and delivery requirement, contact [email protected] with your drawing or dimensional requirements.
Which material is used to manufacture 085B-1 roller chain sprockets, and why does the material grade matter for heavy-duty UK agricultural applications?
Ever Power manufactures 085B-1 sprockets from C 45 medium-carbon steel, a grade with a carbon content of approximately 0.42–0.50% that provides a well-established balance of tensile strength, tooth root fatigue resistance, and machinability. In agricultural applications — such as the grain handling and seed metering drives common across Lincolnshire and East Anglia — the demanding combination of shock loading, abrasive particles, and seasonal outdoor exposure makes material choice critical. C 45 steel can be heat-treated to increase surface hardness at the tooth contact faces, extending wear life without making the sprocket brittle at the hub bore, which is particularly important when keyway transmissions are subject to start-stop cycling.
When should I plan to replace 085B-1 sprockets on a packaging line to avoid unplanned downtime in my UK manufacturing facility?
Industry practice recommends replacing sprockets at the same time as the chain when a chain has elongated to the point of requiring replacement — typically when chain elongation reaches 2% or when tooth wear produces visible hook or shark-fin profiles on the tooth flank. On well-lubricated, correctly tensioned packaging line drives running at moderate chain speeds, 085B-1 sprockets in C 45 steel typically outlast two to three chain sets before replacement is warranted. Proactive replacement during scheduled shutdowns, rather than reactive replacement after a conveyor stop, is standard practice for ISO-certified UK production facilities where unplanned downtime has a direct cost impact. Keeping one spare set of critical sprocket sizes in stores is recommended.
How do I calculate the correct 085B-1 sprocket tooth count and pitch circle diameter for a specific drive ratio in a UK-built industrial machine?
The transmission ratio i = Z₂ / Z₁, where Z₁ is the driver tooth count and Z₂ is the driven tooth count. Select the driver tooth count first — typically Z17 to Z25 for good polygon effect characteristics — then multiply by the required ratio to find the driven tooth count. Round to the nearest available Z in the 085B-1 table to verify the pitch circle diameter (dᵖ) from the dimensional table above. Centre distance C is then calculated as: C = (dᵖ₁ + dᵖ₂) / 2 + a margin for chain sag and adjustment travel. If the geometry is constrained by the machine envelope, the Ever Power technical team can assist in optimising tooth counts and centre distances for your application.
Ready to Specify 085B-1 Sprockets for Your Next Project?
Get competitive pricing, fast UK delivery, and full dimensional documentation from Ever Power’s specialist team. Custom bore, weld-on hub, and matched drive assembly options available.
✉ Contact Ever Power — Get a Quote
[email protected] • DIN 8187 • ISO/R 606 • C 45 Steel • Z8–Z125 • Custom Configurations
edit by gzl
