Beschreibung
What Is the 081B-1 Sprocket?
The 081B-1 sprocket is a simplex roller chain sprocket manufactured to the internationally recognised DIN 8187 and ISO/R 606 standards. Designed for use with 1/2″ × 1/8″ (12.7 mm pitch) roller chain, this sprocket series is one of the most widely specified components in light to medium-duty power transmission systems across the United Kingdom. Whether you are maintaining a production line in a Yorkshire food processing plant, overhauling a conveyor in a Midlands logistics warehouse, or engineering new packaging equipment in the South East, the 081B-1 sprocket offers the dimensional precision and material integrity that industrial applications demand.
Manufactured from C45 medium-carbon steel, each sprocket in this range delivers a balanced combination of hardness, machinability and fatigue resistance. The tooth geometry is carefully formed to minimise polygonal action — that characteristic variation in chain velocity that causes premature wear in poorly designed drives. Our 081B-1 sprockets are produced with a tooth radius r₃ of 13 mm, a radius width C of 1.0 mm, and a tooth width B₁ of 3 mm, all strictly conforming to published DIN 8187 tolerances. The chain compatibility parameters are equally precise: a 12.7 mm pitch, 3.3 mm internal width, and a roller diameter of 7.75 mm.
The full 081B-1 product range spans 63 tooth counts from Z8 through to Z125, giving design engineers and procurement teams the flexibility to achieve the exact gear ratios their drive systems require. From small-diameter sprockets running at high speed on motor output shafts, to large-diameter driven sprockets with over 500 mm tip diameters, the range accommodates virtually every 1/2″ simplex chain application found in British industry today. Sprockets from Z41 onwards feature an increased hub diameter of 78 mm, and from Z49 the hub is supplied as a weld-on type (denoted by the asterisk in the dimension table). From Z85 upwards, the hub diameter increases further to 80 mm, providing the structural mass and rigidity that large-diameter, high-torque applications genuinely require.
Need 081B-1 sprockets for your UK facility? Our engineering team responds within 24 hours.
Technical Parameters
| Tooth radius r₃ | 13 mm |
| Radius width C | 1.0 mm |
| Tooth width B₁ | 3 mm |
| Pitch | 12.7 mm |
| Internal width | 3.3 mm |
| Roller Φ | 7.75 mm |
| Grade | C 45 Steel |
| Hub type | *Weld-on |
| Plate note | H=5mm (Z≥31) |
* From Z=49, weld-on hub applies (marked with asterisk in dimension table). H=5mm: from Z=31 the width of the plate is increased.
Full Dimensional Table — 081B-1 (All dimensions in mm)
Standard: DIN 8187 / ISO/R 606 • Simplex (1/2″ × 1/8″) • *Weld-on hub • Z8 to Z125
| Z | dₑ (mm) | dₚ (mm) | dₕ (mm) | D₁ (mm) | A (mm) |
|---|---|---|---|---|---|
| 8 | 37.2 | 33.18 | 21 | 8 | 14 |
| 9 | 41.5 | 37.13 | 25 | 8 | 14 |
| 10 | 46.2 | 41.10 | 28 | 8 | 14 |
| 11 | 49.6 | 45.07 | 31 | 8 | 16 |
| 12 | 53.9 | 49.07 | 35 | 8 | 16 |
| 13 | 58.4 | 53.06 | 39 | 8 | 16 |
| 14 | 62.8 | 57.07 | 43 | 8 | 16 |
| 15 | 66.8 | 61.09 | 47 | 8 | 16 |
| 16 | 70.9 | 65.10 | 50 | 10 | 18 |
| 17 | 74.9 | 69.11 | 50 | 10 | 18 |
| 18 | 78.9 | 73.14 | 50 | 10 | 18 |
| 19 | 82.9 | 77.16 | 50 | 10 | 18 |
| 20 | 86.9 | 81.19 | 50 | 10 | 18 |
| 21 | 91.0 | 85.22 | 60 | 12 | 20 |
| 22 | 95.0 | 89.24 | 60 | 12 | 20 |
| 23 | 99.0 | 93.27 | 60 | 12 | 20 |
| 24 | 103.0 | 97.29 | 60 | 12 | 20 |
| 25 | 107.1 | 101.33 | 60 | 12 | 20 |
| 26 | 111.2 | 105.36 | 70 | 16 | 20 |
| 27 | 115.4 | 109.40 | 70 | 16 | 20 |
| 28 | 119.4 | 113.42 | 70 | 16 | 20 |
| 29 | 123.4 | 117.46 | 70 | 16 | 20 |
| 30 | 127.5 | 121.50 | 70 | 16 | 20 |
| 31 | 131.5 | 125.54 | 70 | 16 | 20 |
| 32 | 135.5 | 129.56 | 70 | 16 | 20 |
| 33 | 139.6 | 133.60 | 70 | 16 | 20 |
| 34 | 143.6 | 137.64 | 70 | 16 | 20 |
| 35 | 147.6 | 141.68 | 70 | 16 | 20 |
| 36 | 151.7 | 145.72 | 70 | 16 | 25 |
| 37 | 155.7 | 149.76 | 70 | 16 | 25 |
| 38 | 159.8 | 153.80 | 70 | 16 | 25 |
| 39 | 163.8 | 157.83 | 70 | 16 | 25 |
| 40 | 167.8 | 161.87 | 70 | 16 | 25 |
| 41 | 171.4 | 165.91 | 78 | 16 | 32 |
| 42 | 175.4 | 169.95 | 78 | 16 | 32 |
| 43 | 179.5 | 173.99 | 78 | 16 | 32 |
| 44 | 183.5 | 178.03 | 78 | 16 | 32 |
| 45 | 187.5 | 182.07 | 78 | 16 | 32 |
| 46 | 191.6 | 186.10 | 78 | 16 | 32 |
| 47 | 195.6 | 190.14 | 78 | 16 | 32 |
| 48 | 199.7 | 194.18 | 78 | 16 | 32 |
| 49 | 203.7 | 198.22 | *78 | 16 | 32 |
| 50 | 207.8 | 202.26 | *78 | 16 | 32 |
| 51 | 211.8 | 206.30 | *78 | 16 | 32 |
| 52 | 215.9 | 210.34 | *78 | 16 | 32 |
| 53 | 219.9 | 214.37 | *78 | 16 | 32 |
| 54 | 224.0 | 218.43 | *78 | 16 | 32 |
| 55 | 228.0 | 222.46 | *78 | 16 | 32 |
| 56 | 232.1 | 226.50 | *78 | 16 | 32 |
| 57 | 236.1 | 230.54 | *78 | 16 | 32 |
| 58 | 240.2 | 234.58 | *78 | 16 | 32 |
| 59 | 244.2 | 238.62 | *78 | 16 | 32 |
| 60 | 248.2 | 242.66 | *78 | 16 | 32 |
| 62 | 256.7 | 250.75 | *78 | 16 | 32 |
| 64 | 264.8 | 258.82 | *78 | 16 | 32 |
| 65 | 268.8 | 262.86 | *78 | 16 | 32 |
| 66 | 272.9 | 266.90 | *78 | 16 | 32 |
| 68 | 280.9 | 274.99 | *78 | 16 | 32 |
| 70 | 289.0 | 283.07 | *78 | 16 | 32 |
| 72 | 297.1 | 291.16 | *78 | 16 | 32 |
| 76 | 313.3 | 307.33 | *78 | 16 | 32 |
| 78 | 321.4 | 315.40 | *78 | 16 | 32 |
| 80 | 329.4 | 323.48 | *78 | 16 | 32 |
| 85 | 349.7 | 343.70 | *80 | 16 | 32 |
| 90 | 369.9 | 363.90 | *80 | 16 | 32 |
| 95 | 390.1 | 384.10 | *80 | 16 | 32 |
| 100 | 410.3 | 404.31 | *80 | 16 | 32 |
| 110 | 450.7 | 444.74 | *80 | 16 | 32 |
| 114 | 466.9 | 460.90 | *80 | 16 | 32 |
| 120 | 491.2 | 485.16 | *80 | 16 | 32 |
| 125 | 511.4 | 505.37 | *80 | 16 | 32 |
Material, Construction & Engineering Principles
Every 081B-1 sprocket is cut from C45 medium-carbon steel, a grade that has been a staple of power transmission manufacturing for decades. C45 offers a tensile strength in the range of 600–800 N/mm² in the normalised condition, rising significantly after induction hardening or through-hardening treatments. This makes it well-suited to the cyclical loading that sprocket teeth experience during operation — repeated impact, bending, and surface contact stress that would cause rapid failure in softer materials. The machinability of C45 also allows tooth profiles to be finished to tight tolerances without excessive tooling wear, which is why it remains the preferred material for DIN-standard sprocket production.
The tooth form of the 081B-1 sprocket is engineered to minimise the polygonal action inherent in chain-and-sprocket drives. As a chain engages with a sprocket, the pitch polygon of the sprocket causes the chain velocity to fluctuate slightly with each tooth engagement — an effect known as chordal (or polygonal) action. Higher tooth counts reduce this velocity variation, which is why the 081B-1 range extends up to Z125: a high-tooth-count driven sprocket in a two-sprocket drive will run far more smoothly and quietly than a comparable small-tooth alternative. The geometry of the tooth root and flank in this range is designed in strict accordance with DIN 8187, ensuring full compatibility with matching 081B-1 roller chain.
From Z=31 onwards, a step-plate construction is used: the hub plate thickness H is set at 5 mm, increasing the structural cross-section at the hub boss and improving the sprocket’s resistance to torsional stress. This detail becomes particularly important when the 081B-1 sprocket is mounted on a shaft subject to shock or reversing loads, as is common in cam-driven packaging machinery and indexing conveyors found in British manufacturing facilities.
Why Choose 081B-1 Sprockets from Ever Power?
Every sprocket is manufactured and verified against published DIN 8187 and ISO/R 606 dimensional standards, giving UK engineers the confidence to specify with accuracy.
Medium-carbon C45 steel delivers excellent hardness, machinability, and fatigue resistance — the ideal balance for demanding industrial chain drive applications.
With 63 tooth counts in a single product family, you can achieve virtually any drive ratio without resorting to non-standard solutions or costly bespoke manufacture.
The weld-on hub design (Z49+) offers permanent, high-torque shaft attachment with exceptional concentricity — ideal where axial retention and vibration resistance matter most.
Stock items ship quickly to addresses across England, Scotland, Wales and Northern Ireland, minimising production downtime for UK maintenance and engineering teams.
Our application engineers are available to assist with sprocket selection, drive ratio calculations, and custom bore or hub modification requirements for UK-based OEM and MRO customers.
Where Are 081B-1 Sprockets Used in the UK?
The 081B-1 sprocket’s combination of compact pitch (12.7 mm), wide tooth count range, and C45 steel construction makes it a natural choice across a broad spectrum of UK industry sectors. In food and beverage manufacturing — one of the United Kingdom’s largest manufacturing segments, with significant concentrations in Yorkshire, East Anglia, and the Scottish Lowlands — these sprockets are routinely used on conveyor chain drives for bottling lines, bakery cooling conveyors, and ingredient dosing systems. Their standard bore diameters and optional custom-machined bores make integration into both new-build and legacy equipment straightforward.
Agricultural machinery manufacturers in Lincolnshire, Suffolk and the Scottish Borders specify 081B-1 sprockets extensively for seed drill drives, harvester cross-conveyors and small-scale irrigation pump drives. The open-field environment imposes demanding conditions on chain drives: exposure to grit and moisture, seasonal shock loading, and long intervals between maintenance. C45 steel sprockets with well-formed tooth flanks tolerate this abuse better than lower-grade alternatives, and their dimensional standardisation means replacement during harvest season is rarely a problem.
In pharmaceutical and medical device manufacturing — concentrated in the Thames Valley, Cambridge life sciences cluster, and Northern Ireland — 081B-1 sprockets are specified on cleanroom-compatible conveyor systems, tablet press feed mechanisms, and automated assembly equipment. Here, the dimensional repeatability that DIN 8187 compliance guarantees is critical: drive systems must run within validated parameters without adjustment for weeks or months at a time. Packaging machinery OEMs in the West Midlands and Greater Manchester also rely heavily on this sprocket series for index drives, carton erection mechanisms, and shrink-tunnel conveyors.
Customer Success Case Study
Harrogate Artisan Bakery — Cooling Conveyor Drive Upgrade
A mid-sized artisan bakery in Harrogate, North Yorkshire was experiencing persistent chain drive failures on two cooling conveyor lines. The installed sprockets — sourced from a low-cost supplier — were nominally 081B-1 but lacked consistent tooth profile accuracy, resulting in rapid chain elongation and unscheduled downtime averaging four hours per week across both lines. The maintenance team calculated this was costing the facility approximately £115,000 per year in lost production and emergency labour.
Following consultation with an Ever Power application engineer, the facility upgraded both drive systems using Z25 driving sprockets and Z19 driven sprockets from the 081B-1 range, fully conforming to DIN 8187. The accurate tooth profile reduced chain engagement shock significantly, and chain wear rates dropped to a fraction of the previous levels. Within the first six months of operation, unscheduled conveyor downtime had been reduced by 62%, and the engineering team reported the drive systems were quieter and more consistent in speed than at any point in the facility’s history.
What UK Engineers Say
“We’ve been sourcing 081B-1 sprockets from Ever Power for two years for our agricultural conveyor OEM business in Lincolnshire. The DIN 8187 compliance is genuine — tooth profiles are consistently accurate and chain wear rates are exactly what you’d expect from a correctly-made sprocket. Delivery to our facility is reliable and the technical team is helpful when we need non-standard bore sizes.”
“Ordered a full set of replacement Z32 081B-1 sprockets for a pharmaceutical conveyor line at short notice. They arrived next-day to our Bristol site, dimensions were spot-on, and fitting was straightforward. We’ve had zero chain-related issues in the four months since installation. The price point is competitive for the quality you’re getting.”
“We design and build printing and labelling machinery and use the 081B-1 series extensively for index drives. The tooth profile accuracy directly affects print registration, so we can’t afford to use substandard sprockets. Ever Power’s 081B-1 range has never let us down. We particularly value the availability of custom bores — makes integration into our machine designs much simpler.”
Custom Sprocket Manufacturing & Modification Services
Beyond the standard 081B-1 range, Ever Power’s manufacturing facility offers a comprehensive customisation service tailored to the exact requirements of UK OEM designers and MRO procurement teams. Standard bore diameters can be re-machined to any size within the hub diameter range, and keyways, keyway slots, and set-screw tappings can be added to finished sprockets to customer drawings. Taper-lock bore conversion is available for customers who require rapid, repeatable shaft mounting without keys or set screws.
Surface treatment options include induction hardening of the tooth flanks for abrasive applications, black oxide finishing for corrosion resistance in damp or moderately aggressive environments, and zinc phosphating as a pre-paint base for outdoor agricultural equipment. For food-grade applications where stainless steel is a regulatory requirement, we can supply custom-manufactured 081B-1 profile sprockets in grade 304 or 316 stainless steel to order, with competitive lead times and low minimum order quantities. Our production facility operates to ISO 9001 quality management standards, and full dimensional inspection records are available on request for customers in regulated industries.
081B-1 Sprockets 1/2″ × 1/8″ | DIN 8187 / ISO/R 606 | C45 Steel | Z8–Z125 | Supplied to UK customers across England, Scotland, Wales & Northern Ireland
edit by gzl
