Plate Wheel Sprocket 081B-1 | DIN 8187 ISO 606 – 8 to 125 Teeth

Plate Wheel Sprocket

Korea Ever-Power plate wheel sprockets 081B-1 comply with DIN 8187 / ISO/R 606 for 1/2 × 1/8 inch chain. With 47 tooth counts from 8Z to 125Z covering pitch circle diameters from 33 mm up to 505 mm, and a hub-free flat plate profile that fits where a conventional hubbed sprocket cannot, these are the practical choice for compact drive layouts in conveyor chain systems, packaging machinery, and agricultural equipment across Korea.

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Plate Wheel Sprocket 081B-1 — European Standard, Hub-Free Design

A plate wheel is a sprocket without a projecting hub — the bore passes directly through the flat disc body of the wheel, and the chain engages toothed projections machined around the circumference. This profile is sometimes called a "toothed disc" or "flat sprocket" in workshop terminology. The absence of a hub makes the plate wheel thinner in the axial direction than a conventional B-hub or C-hub sprocket, which is a practical advantage in cramped drive arrangements where shaft centre-to-face dimensions are constrained.

Plate Wheel Sprocket

The 081B-1 designation follows the DIN 8187 coding system: 081 indicates the chain series (1/2 × 1/8 inch, pitch 12.7 mm), B indicates the European pitch standard, and 1 indicates simplex (single strand). Korea Ever-Power manufactures the 081B-1 series in grey cast iron to the full tooth count range specified in the DIN 8187 standard, from 8Z through 125Z.

  • ⚙Chain series: 081B-1 (1/2 × 1/8 inch, pitch 12.7 mm) — DIN 8187 / ISO/R 606
  • ⚙Tooth counts: 8Z to 125Z (47 standard sizes)
  • ⚙Pitch circle diameter range: 33.18 mm (8Z) to 505.37 mm (125Z)
  • ⚙Profile: flat plate, no hub projection — minimal axial space requirement
  • ⚙Material: grey cast iron; custom bore and keyway available on request

Chain Reference Data — 081B-1 Matching Parameters

Before reading the main dimension table, confirm that the chain installed on your equipment matches the following parameters. A single mismatch — particularly on roller diameter or internal width — will cause incorrect tooth engagement and accelerated wear on both the chain and the sprocket.

Parameter Value
Pitch 12.7 mm
Internal width 3.3 mm
Roller diameter 7.75 mm
Tooth radius r₃ 13 mm
Radius width C 1.0 mm
Tooth width B₁ 3 mm
Plate width note H=4 mm from Z=30; H=6 mm from Z=90

Full Dimensional Data — 081B-1 All Tooth Counts

The table lists tip diameter (de), pitch circle diameter (dp), and standard bore (D1) for every available tooth count from 8Z to 125Z. Tip diameter is the outer measurement across tooth peaks; pitch circle diameter is the functional engagement diameter. The bore column shows the smallest standard stock bore — contact us for any bore diameter up to the maximum physically possible for each wheel size.

Plate Wheel Sprocket Dimension

Z de (mm) dp (mm) D1 Bore (mm)
8 37.2 33.18 8
9 41.5 37.13 8
10 46.2 41.10 8
11 49.6 45.07 8
12 53.9 49.07 8
13 58.4 53.06 8
14 62.8 57.07 8
15 66.8 61.09 8
16 70.9 65.10 8
17 74.9 69.11 8
18 78.9 73.14 8
19 82.9 77.16 8
20 86.9 81.19 8
21 91.0 85.22 8
22 95.0 89.24 10
23 99.0 93.27 10
24 103.0 97.29 10
25 107.1 101.33 10
26 111.2 105.36 12
27 115.4 109.40 12
28 119.4 113.42 12
29 123.4 117.46 12
30 127.5 121.50 12
31 131.5 125.54 12
32 135.5 129.56 12
33 139.6 133.60 12
34 143.6 137.64 12
35 147.6 141.68 12
36 151.7 145.72 16
37 155.7 149.76 16
38 159.8 153.80 16
39 163.8 157.83 16
40 167.8 161.87 16
41 171.4 165.91 16
42 175.4 169.95 16
43 179.5 173.99 16
44 183.5 178.03 16
45 187.5 182.07 16
46 191.6 186.10 20
47 195.6 190.14 20
48 199.7 194.18 20
49 203.7 198.22 20
50 207.8 202.26 20
51 211.8 206.30 20
52 215.9 210.34 20
53 219.9 214.37 20
54 224.0 218.43 20
55 228.0 222.46 20
56 232.1 226.50 20
57 236.1 230.54 20
58 240.2 234.58 20
59 244.2 238.62 20
60 248.2 242.66 20
62 256.7 250.75 20
64 264.8 258.82 20
65 268.8 262.86 20
66 272.9 266.90 25
68 280.9 274.99 25
70 289.0 283.07 25
72 297.1 291.16 25
76 313.3 307.33 25
78 321.4 315.40 25
80 329.4 323.48 25
85 349.7 343.70 25
90 369.9 363.90 25
95 390.1 384.10 25
100 410.3 404.31 25
110 450.7 444.74 25
114 466.9 460.90 25
120 491.2 485.16 25
125 511.4 505.37 25

plate wheel sprocket and roller chain DIN 8187 081B drive system

Plate Wheel vs. Hubbed Sprocket — Which Profile Do You Need?

Both plate wheels and hubbed sprockets engage the same DIN 8187 roller chain, but they serve different installation requirements. Choosing the wrong profile creates mounting problems that cannot be resolved without changing the sprocket type.

Feature Plate Wheel (081B-1) B-Hub / C-Hub Sprocket
Axial thickness Minimal — flat plate only Hub projects beyond plate face
Shaft engagement Bore through plate body only Hub provides longer bore engagement
Torque capacity Limited by plate thickness — suitable for moderate torque Higher torque — longer key engagement
Ideal application Tight shaft spacing, idlers, low-torque driven ends Main drive sprockets, high-torque input shafts
Weld-on option Yes — can be welded to a shaft flange Weld-on hub type available separately
Cost Lower — less material, simpler casting Higher due to hub machining

In practice, plate wheels are most often used on the driven (large) sprocket position in agricultural and conveyor drives, where shaft space is limited and the large diameter provides sufficient moment arm for torque transmission even without a hub.

plate wheel and sprocket range DIN 8187 Korean industrial application

Installation and Alignment — Plate Wheel Sprockets

Correct installation is as important as correct specification. A plate wheel fitted with misalignment or improper retention will wear chain and sprocket teeth at an accelerated rate even when all dimensional specifications are correct.

📐 Shaft Alignment

Driver and driven sprockets must be aligned so that their mid-planes are parallel within 0.5 mm per 100 mm of centre distance. Use a straight edge placed across both sprocket faces to check parallelism. Angular misalignment — where one shaft is tilted relative to the other — causes the chain to run unevenly across the tooth width, wearing one side of the tooth preferentially and eventually causing the chain to climb off the sprocket under load.

🔧 Key and Set Screw Retention

Plate wheels with a bore and keyway should be fitted with a parallel key to the DIN 6885 standard for the shaft diameter. After fitting the key, tighten the set screw (or screws) to the manufacturer's torque specification for the screw size — typically 6–15 Nm for M6–M10 set screws. A common installation error is relying on the set screw alone without a key: the set screw prevents axial movement but cannot resist rotational slip under torque alone for sustained-load applications.

⚙ Chain Tension After Fitting

After fitting the sprockets and chain, adjust centre distance until the chain sag on the slack run is 2–4% of the centre distance length. For a centre distance of 500 mm, this means 10–20 mm of sag measured at the midpoint of the lower run. Too tight accelerates bearing wear; too loose causes the chain to skip or whip. Final check: rotate the drive slowly by hand — the chain should run smoothly onto and off both sprockets without binding or lateral movement at any point in the rotation.

Typical Applications for 081B-1 Plate Wheel Sprockets

📦 Packaging and Bottling Lines

plate wheel sprocket packaging bottling conveyor application

Light-duty 081B chain drives on bottle conveyors, labelling machines, and carton erectors use plate wheel sprockets on driven shafts where the shaft protrusion is limited by adjacent machine guards or frames. The flat plate profile allows the sprocket to sit flush against a bearing housing, gaining axial clearance that a B-hub sprocket would consume.

🌾 Seed Drills and Planters

plate wheel sprocket seed drill agricultural planter

Korean seed drills and row crop planters commonly use 081B chain to drive metering rolls and ground wheels. Large tooth-count plate wheels (60Z–90Z) on the metering shaft provide the speed reduction required to synchronise seed discharge with forward travel speed. The plate wheel's flat profile is preferred here because it allows multiple sprockets to be stacked side by side on the same shaft with minimal spacing between rows.

Matching Roller Chain for 081B-1 Plate Wheels

081B roller chain DIN 8187 matching chain for plate wheel sprocket

The 081B-1 plate wheel is designed for use with 081B roller chain to DIN 8187 — pitch 12.7 mm, roller diameter 7.75 mm, inner width 3.3 mm. This is a lighter-duty chain series than the more common 08B (also 12.7 mm pitch but wider at 7.75 mm inner width). Confirm your existing chain's inner width before ordering: 081B chain is 3.3 mm wide; 08B chain is 7.75 mm wide. The two series use different sprocket tooth widths and are not interchangeable despite sharing the same pitch. Korea Ever-Power stocks both series in simplex, duplex, and triplex configurations.

A complete chain and sprocket drive system supplied from a single manufacturer eliminates the dimensional tolerance accumulation that occurs when mixing chains and sprockets from different sources. All Korea Ever-Power 081B chain and 081B-1 plate wheels are manufactured to the same DIN 8187 tooth geometry, ensuring consistent roller-to-tooth engagement across the full range.

Why Korea Ever-Power Chain and Sprocket

Korea Ever-Power sprocket plate wheel manufacturing workshop

Korea Ever-Power Chain and Sprocket Co., Ltd. manufactures and stocks the complete 081B-1 plate wheel range for the Korean market:

✦Full Z=8 to Z=125 range stocked — all standard tooth counts available without special-order lead time
✦DIN 8187 tooth geometry verified — pitch circle concentricity checked to ensure bore-to-pitch-circle alignment
✦Custom bore machining — keyways and set screw tappings to customer drawings; 5–10 day turnaround
✦Same-supplier chain and sprocket — 081B roller chain stocked alongside plate wheels for matched tolerances
✦Technical assistance — gear ratio calculation, tooth count selection, and chain length calculation available before order placement

Frequently Asked Questions

What is the difference between a plate wheel and a standard sprocket?
A plate wheel (also called a flat sprocket or toothed disc) has no projecting hub — the bore passes directly through the flat body. A standard B-hub or C-hub sprocket has a cylindrical hub that projects on one or both sides. The plate wheel's advantage is minimal axial space requirement; the hubbed sprocket's advantage is longer shaft engagement for higher torque transmission. Both engage the same DIN 8187 roller chain identically.
Is 081B chain the same as 08B chain?
No — they share the same 12.7 mm pitch but differ in inner width and roller diameter. 081B chain has an inner width of 3.3 mm and roller diameter of 7.75 mm. 08B chain has an inner width of 7.75 mm and roller diameter of 8.51 mm. They use different sprocket tooth widths (B₁ = 3 mm for 081B vs. 7.0 mm for 08B) and are not interchangeable. Check your existing chain markings carefully before ordering the plate wheel.
What is the correct chain sag for a drive using 081B-1 plate wheels?
Aim for 2–4% of the shaft centre distance as the sag measurement on the slack run. For a 400 mm centre distance this means 8–16 mm sag. 081B is a relatively light-duty chain, so excessive tension is especially damaging — overtension places disproportionate load on the small inner plates. Check and re-tension after the first 8–10 hours of operation, as new chain settles during the initial running-in period.
Why does the bore size increase at higher tooth counts?
As the sprocket diameter increases with tooth count, the plate body becomes physically thicker to maintain structural integrity. The larger bore listed for higher tooth counts reflects the minimum bore that can be machined while leaving adequate material wall thickness around the bore. For large-diameter plate wheels (80Z and above), custom bores significantly larger than the listed standard are possible — specify your exact shaft diameter when ordering.
How do I calculate how many chain links I need for a given centre distance?
The standard formula is: L = 2C/p + (z₁+z₂)/2 + (z₂-z₁)² / (4π²C/p), where L is link count (round up to the nearest even number), C is centre distance in mm, p is pitch (12.7 mm for 081B), z₁ and z₂ are the two tooth counts. For most practical drives with moderate speed ratios, the simplified approximation L ≈ 2C/p + (z₁+z₂)/2 is accurate enough to within one link. Korea Ever-Power can calculate the exact required link count if you provide centre distance and tooth counts.
Can plate wheels be used on vertical drives?
Yes, with the caveat that vertical drives typically have no natural catenary sag on the slack run. A chain tensioner or adjustable centre distance is more important on vertical drives than on horizontal ones. The plate wheel itself functions identically in any orientation — it is the chain management that requires more attention when both runs are vertical and chain weight does not assist in maintaining contact with the sprocket teeth.

Customer Reviews

Verified feedback from customers in Korea and surrounding markets.

Lim Cheol-soo, Mechanical Engineer, Beverage Packaging Company, Gyeonggi-do (early 2025)

"We use 081B-1 plate wheels on the driven ends of our bottle labelling conveyors — shaft space is very limited at these positions and the flat profile was the only practical option. Korea Ever-Power supplied 20Z and 35Z wheels in the correct bore size without needing custom machining. Both sizes were in stock and delivered within eight days."

Choi Young-jin, Farm Equipment Service Engineer, South Jeolla Province (2024)

"Replaced 45Z and 60Z plate wheel sprockets on a seed drill metering drive. The Korean supplier we previously used could not get the 60Z in stock — Korea Ever-Power had it available. Dimensions matched the original exactly. The machine has been running through the full planting season without issues."

Han Mi-rae, Procurement, Printing Equipment Manufacturer, Seoul (Q4 2024)

"We buy 081B-1 plate wheels in quantities of 50–100 units per order for our printing machine production line. Consistent bore diameter and tooth profile are important for us because we do not individually inspect every unit. In 18 months of purchasing from Korea Ever-Power, we have not had a fit problem on the assembly floor."

Park Sung-min, Workshop Technician, Textile Mill, Daegu (2025)

"We needed 081B-1 sprockets with a custom bore of 18mm for a loom drive. Korea Ever-Power machined the custom bore and added a 5mm keyway. Lead time was seven days for 12 pieces. The keyway dimensions were correct and the fit on the shaft was as specified."

Kim Tae-young, Maintenance Supervisor, Food Processing Plant, North Gyeongsang Province (early 2025)

"We replaced conveyor chain and sprockets together on a scheduled shutdown. Used Korea Ever-Power 081B chain and matching 081B-1 plate wheels. Running them in-together from a matched source has given us noticeably better running smoothness than the previous mixed-brand combination. No adjustment needed after the first 40 hours."

 

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