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DIN 8187 | ISO/R 606 | C45 Steel | UK Industrial Supply
083B / 084B-1 Sprockets
1/2″ × 3/16″ — Simplex Roller Chain
Precision-hobbed chain sprockets engineered to DIN 8187 and ISO/R 606 standards. Supplied across England, Scotland, Wales and Northern Ireland for industrial, agricultural, food processing and logistics drive systems.
The 083B/084B-1 sprocket is one of the most widely specified chain drive components in British industry. Conforming to DIN 8187 and ISO/R 606, these sprockets are machined from C 45 medium-carbon steel and designed to operate with 1/2″ pitch roller chain — matching a pitch of 12.7 mm, internal width of 4.88 mm and roller diameter of 7.75 mm. The tooth profile is precision-hobbed rather than form-milled, delivering consistent pitch circle accuracy from Z=8 through to Z=125. Whether you are specifying a small conveyor for a packaging line in the East Midlands or overhauling a harvesting machine in Norfolk, the 083B range provides a dimensionally correct, long-lasting solution that eliminates the guesswork inherent in non-standard alternatives.
Why 083B/084B-1 Sprockets Outperform Generic Alternatives
When a drive system develops chain skip, excessive vibration or premature wear, the cause is very often dimensional non-conformance at the sprocket tooth. Generic sprockets sourced without reference to DIN 8187 frequently exhibit tooth flank radii that are slightly off, seating arcs that do not match the roller diameter precisely, or hub dimensions that require additional machining to fit a standard shaft. The 083B/084B-1 range eliminates all of these issues at source. The tooth radius of 13 mm and tooth width B1 of 4.5 mm are calculated specifically for the 7.75 mm roller, distributing contact stress evenly and minimising the sliding velocity component that drives pin and bush wear inside the chain. Maintenance engineers across UK industries consistently report substantially longer chain replacement intervals after switching to dimensionally correct sprockets — the drive simply runs quieter, smoother and with lower peak chain tension across the full operating speed range.
The weld-on hub option — indicated by an asterisk (*) in the dimension table for larger tooth counts — is particularly valuable for retrofit installations where the original shaft cannot easily be re-machined. Welding directly to the shaft eliminates the need for a conventional bore-and-keyway setup and gives the installer greater flexibility in positioning the sprocket axially along the shaft. This is a feature routinely specified by agricultural machinery workshops throughout the UK’s arable and livestock farming regions, where older equipment is maintained with pragmatic engineering solutions rather than full component replacement.
Key Product Advantages
DIN 8187 / ISO/R 606 Certified Geometry
Every tooth form is machined to the published standard profile — not approximated. Drop-in compatibility with existing 08B-1 chain drives. No re-alignment, no rework, no nasty surprises on installation. Ideal for UK OEM production lines where traceability matters.
C 45 Medium-Carbon Steel Construction
C 45 offers the right balance of machinability and strength — approximately 700 MPa tensile after heat treatment. Tooth flanks can be selectively induction-hardened to 55–60 HRC for extended surface life, while the tough core resists shock loads from sudden torque spikes.
Full Range Z=8 to Z=125
From compact eight-tooth sprockets in tight-space drives to 125-tooth units on large conveyor head pulleys, the complete range is stocked and available. This breadth removes the need to compromise on drive ratio or resort to secondary machining to hit a specific gear ratio.
Weld-On Hub for Retrofit Flexibility
Larger sizes ship with weld-on hub construction as standard (*). Perfect for agricultural machinery workshops across the UK where existing shafts cannot be easily re-bored and positional flexibility is more important than a conventional keyed arrangement.
Fast UK Dispatch & Custom Boring
Stock units dispatched within 1–2 working days to UK mainland addresses. Custom bore, keyway and set-screw work completed and shipped within 5–7 working days. Urgent production requirements are accommodated — contact our engineering team at the enquiry stage.
CNC Hobbed Tooth Accuracy
CNC gear hobbing generates an accurate tooth form with consistent pitch across every sprocket in a batch. This matters in high-speed packaging and conveyor applications where pitch error translates directly into vibration, noise and accelerated chain elongation between maintenance intervals.
Technical & Dimensional Specifications
Sprocket — mm
| Tooth radius rs | 13 |
| Radius width C | 1.3 |
| Tooth width B1 | 4.5 |
Chain — mm
| Pitch | 12.7 |
| Internal width | 4.88 |
| Roller Φ | 7.75 |
Material & Standard
| Material | C 45 Steel |
| Standard | DIN 8187 / ISO/R 606 |
| Hub option | Weld-on (*) |
SIMPLEX Dimensional Data — 083B/084B-1 (all dimensions in mm)
* Weld-on hub. All dimensions in mm. Z = number of teeth | de = tip circle diameter | dp = pitch circle diameter | dm = bore diameter | D1 = keyway width | A = hub length
Material Science, Operating Principle & Application Scenarios
C 45 is a medium-carbon steel defined under EN 10083. Its carbon content of approximately 0.45% provides a meaningful response to both normalising and quench-and-temper heat treatments, making it well-suited to components that need a hard, wear-resistant surface on a tough, impact-resistant core. For 083B/084B-1 sprockets, the tooth flanks experience a combination of Hertzian contact stress from roller engagement and sliding friction from the chordal velocity variation that occurs as the chain polygonally wraps the sprocket. C 45 handles this loading regime reliably in the majority of UK industrial applications without the need for additional treatment. Where the duty is more severe — continuous high-speed operation, inadequate lubrication, or exposure to abrasive contaminants — selective induction hardening of the tooth form to 55–60 HRC is available as a factory option, dramatically extending tooth life without making the material brittle or prone to chipping.
The DIN 8187 tooth form itself is a three-radius profile. The seating arc at the base of the tooth space conforms closely to the 7.75 mm chain roller, maximising the contact area and distributing load over a larger surface. As the chain pulls away from the sprocket, the working flank geometry controls the rate at which the roller disengages, limiting the impact velocity component that would otherwise generate noise and accelerated wear. In practical terms, drives using correctly-specified sprockets of this type run noticeably quieter than those using off-standard components, and the chain elongation rate slows measurably — which matters enormously to maintenance planners in UK food manufacturing sites that operate 24-hour production shifts.
🏭 Automotive & Engineering
Indexing and timing drives in UK automotive component manufacturers, robotics integrators and precision engineering shops requiring tight pitch accuracy and predictable maintenance intervals.
🌿 Agricultural Machinery
Combine harvesters, balers, seed drills and potato harvesters across UK arable regions. The weld-on hub option is particularly valued by machinery dealers in Lincolnshire, Yorkshire and East Anglia.
📦 Logistics & Conveying
High-speed sorter and conveyor drives in UK distribution centres and parcel handling facilities where continuous operation and low-noise running are both essential operational requirements.
🍔 Food & Beverage Processing
Portioning, weighing and conveying machinery throughout UK food plants operating under BRC and SALSA standards, where wash-down routines and hygiene compliance govern material and surface finish choices.
Customer Success Story
Case Study — West Yorkshire, United Kingdom | Food Manufacturing
73% Reduction in Unplanned Downtime on Bakery Conveyor Lines
A mid-sized commercial bakery in West Yorkshire was running three continuous conveyor lines in its sliced bread department, operating 18 hours per day on a five-day shift pattern. The maintenance team was dealing with an average of 2.3 unplanned stoppages per week, each requiring 45–90 minutes to restore production. Emergency call-out costs and lost batch revenue were significant. An engineering review traced the problem to sprockets sourced from a local general industrial supplier — they were visually similar to the specified DIN 8187 components but had measurably non-conformant tooth profiles, causing inconsistent roller engagement and accelerated chain elongation.
The site engineering manager contacted Ever Power and placed an initial order for 083B/084B-1 sprockets in Z=19 and Z=38 configurations, with custom 25 mm bores and DIN 6885 keyways to fit the existing motor and head shaft arrangements. Finished parts arrived within six working days. Within the first production month following changeover, unplanned stoppages dropped to 0.6 per week. Over the following twelve months, total downtime-related production losses fell by 73%, and the drive chains on all three lines completed a full calendar year without replacement — previously, chains had required changing every three to four months. The procurement manager noted that the total cost of the sprocket upgrade, including fitting labour, was recovered within the first eight weeks of operation.
What Our Clients Say
★★★★★
“Dimensional accuracy was exactly what we needed — the sprockets dropped straight onto the existing shafts without any rework. Running two seasons on our grain conveyor systems now and the tooth wear rate is noticeably lower than what we had before. Custom bore lead time of five days is workable for us. Would order again without hesitation.”
— James R., Plant Engineer
Agricultural Equipment Supplier, Lincolnshire, England
★★★★★
“Sourcing DIN 8187 sprockets in the larger tooth counts used to mean waiting weeks for European delivery. Having a responsive supplier covering the full Z range with sensible pricing has genuinely improved our maintenance scheduling. The Z=72 unit we ordered ran 18 months on our carton-sealing conveyor without requiring adjustment. That’s the sort of reliability you build a service contract around.”
— Sarah M., Maintenance Manager
Packaging Automation, West Midlands, England
★★★★★
“We needed a non-standard bore with a flat on one side for a shaft retention arrangement our design team had specified. The engineering team reviewed our drawing, confirmed it was achievable, and had finished parts with us inside a week. Fit was perfect first time. That level of responsiveness on a custom job is genuinely rare — it’s the reason we continue to place our OEM production volumes here.”
— Mark T., Design Engineer
Conveyor Systems OEM, Greater Manchester, England
Ever Power — Manufacturing Capability & Custom Sprocket Solutions
Our machining facility operates a dedicated sprocket production line with CNC gear hobbing centres capable of handling the full 083B range from Z=8 through Z=125 in a single setup. Each blank is turned and faced to drawing tolerance before the hobbing operation, ensuring bore run-out and face perpendicularity meet the requirements of precision drive applications. For UK OEM customers and MRO distributors, we offer full drawing review, first-article inspection with CMM-generated reports, and material certification to EN 10204 3.1 for supply chains requiring documented traceability — which is increasingly standard practice in UK automotive, defence and food sector procurement.
Custom capability extends well beyond a simple bore diameter change. Our engineering team routinely handles non-standard keyway orientations, multiple set-screw positions at customer-specified angles, tapered bore specifications for taper-lock style fitting, flanged hubs for axial sprocket retention, and weld-on hub preparations with defined weld preparation profiles. Surface treatments covering black oxide, zinc phosphate and electrolytic zinc plating are all offered as factory options, providing meaningful corrosion resistance for outdoor agricultural applications and coastal industrial sites throughout the UK. Minimum order quantities for bespoke work are kept low by design — we recognise that prototyping and short-run production requirements should not carry disproportionate commercial risk, and our pricing structure reflects that philosophy.
Custom Bore & Keyway
Any bore from dm minimum to hub capacity. DIN 6885 keyways, set-screws, flats or splined bores to customer drawings.
Surface Treatments
Black oxide, zinc phosphate, zinc plating. Induction hardening to 55–60 HRC for demanding duty applications.
Batch Documentation
EN 10204 3.1 material certs, CMM first-article inspection reports, and dimensional compliance records for regulated supply chains.
Low MOQ Prototyping
Single-piece samples accepted for development projects. Volume pricing applies from batch onwards — no penalty for starting small.
Frequently Asked Questions
What is the price of 083B/084B-1 sprockets for UK industrial buyers, and how do I get an accurate quote from a reliable supplier?
Pricing varies depending on tooth count, bore specification, surface treatment and order quantity. Standard bore units are competitively priced for both one-off maintenance replacements and ongoing OEM supply agreements. To get a full price with delivery cost to your UK address, email sales@gear-chains with your Z number, required bore diameter, keyway details and approximate annual volume.
Which chain standard does an 083B sprocket work with, and where can businesses in England and Scotland source them with fast delivery?
The 083B/084B-1 sprocket is specified for use with 1/2″ pitch roller chain to DIN 8187 and ISO/R 606, also referenced commercially as 08B-1 chain. It is one of the most widely used chain sizes across British industrial, agricultural and food manufacturing applications. We stock the full Z range for rapid dispatch to UK mainland addresses including Scotland, Northern Ireland and Wales.
How long does delivery take when I order custom bore 083B sprockets to a UK industrial site, and what lead time should I allow for urgent requirements?
Stock sprockets with standard dimensions are dispatched within 1–2 working days to UK mainland addresses. Custom bore work — specific diameter, keyway cutting and set-screw tapping — typically ships within 5–7 working days. If you have a breakdown situation or a hard production deadline, contact us at the enquiry stage and we will do what we can to accommodate your timeline.
What material are 083B/084B-1 sprockets made from, and can I request a stainless steel version for food processing applications in the UK?
The standard sprocket is machined from C 45 medium-carbon steel, which is suitable for most industrial applications and can be heat-treated for extended tooth life. For UK food manufacturing environments — where wash-down, hygiene compliance and food-grade lubricant compatibility are requirements — stainless steel variants and specific surface finishes can be quoted on request. Please describe your application when enquiring so we can recommend the most appropriate specification.
When should I replace my 083B sprocket, and what warning signs indicate it has worn beyond safe use on a UK agricultural machine or conveyor?
Replace your sprocket when you observe hooked or shark-fin tooth profiles when viewed from the side, visible chain whipping between drive and driven sprockets at operating speed, or chain elongation that has exceeded 3% of nominal pitch length. In UK agricultural use, inspecting sprockets and chains at the start and end of each working season is good practice. Always replace chain and sprocket as a matched pair — fitting a new chain onto worn sprocket teeth, or new sprockets onto a stretched chain, accelerates wear on the new component significantly.
How do I calculate the correct 083B sprocket tooth count ratio for a new conveyor drive in a UK distribution centre or packaging facility?
The speed reduction ratio equals the driven sprocket tooth count divided by the drive sprocket tooth count. A Z=19 drive paired with a Z=38 driven unit gives a 2:1 reduction, for example. When designing a new drive, aim for a minimum of 17 teeth on the smaller sprocket to reduce chordal action and chain impact at the entry point. If you need assistance sizing a drive system for a specific speed, torque, centre distance and power requirement, our engineering team can provide a free drive calculation for qualified UK enquiries — just contact us with your application details.
Ready to Source 083B/084B-1 Sprockets for Your UK Drive System?
From single replacement units to high-volume OEM supply — with custom bore, keyway, surface treatment and full batch documentation — our engineering team is ready to assist operations across England, Scotland, Wales and Northern Ireland.
Ever Power | DIN 8187 Sprocket Specialists | United Kingdom | edit by gzl
