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When a worn or undersized sprocket is causing chain skip, premature wear, or misalignment in your drive system, finding an exact-match 08B roller chain sprocket in the right tooth count is the fix that actually lasts. Whether you're a maintenance technician keeping conveyor lines running, a machine builder specifying a new drive train, or a hands-on maker rebuilding power transmission equipment, this flat sprocket is engineered to drop in without modification.
Each 08B industrial flat sprocket is machined from carbon steel with a natural finish, designed to mate precisely with standard 08B (1/2" pitch) roller chain. The bore and hub dimensions follow the ISO 606 / BS 228 standard profile. Tooth counts span 10 through 50 teeth for sprocket variants, plus matched 08B roller chain (1.5 m lengths) and connecting link buckle sets — covering the full drive assembly in one listing. Sprocket outer diameters range from approximately 42 mm (1.65 in) at 10T to approximately 204 mm (8.03 in) at 50T, with chain pitch fixed at 12.7 mm (1/2 in).
Typical use cases include light-to-medium industrial conveyor drives, agricultural equipment gear reduction stages, go-kart and mini-bike final drive replacement, and custom CNC or automation build projects requiring a reliable 08B sprocket for roller chain drive systems.
| Chain Standard | ISO 606 / BS 228 — 08B |
|---|---|
| Chain Pitch | 12.7 mm (1/2 in) |
| Tooth Count Range | 10 – 50 Teeth (sprocket variants) |
| Sprocket Type | Flat (non-hubbed) industrial sprocket |
| Material | Carbon steel |
| Finish | Natural / uncoated |
| Outer Diameter (approx.) | See variant options |
| Bore Diameter | See variant options |
| Hub Thickness | See variant options |
| Roller Chain Option | 08B standard & intensified, 1.5 m length |
| Connecting Link Options | 08B Full Buckle (4 pcs) / Half Buckle (2 pcs) |
| Pack Quantity | 1 / 2 / 3 / 5 pcs (model-dependent) |
The tooth count determines your drive ratio. Divide the driven sprocket teeth by the drive sprocket teeth to get the reduction ratio. For example, a 10T drive sprocket paired with a 40T driven sprocket gives a 4:1 reduction. Match the tooth count to your required output speed and torque — smaller drive sprockets increase torque, larger ones increase speed.
Yes — all sprocket variants in this listing are machined to the ISO 606 / BS 228 08B tooth profile with a 12.7 mm (1/2") pitch, which is the international standard for 08B chain. As long as your chain is a genuine 08B (not a similar-looking 40 ANSI chain, which has a different roller diameter), the tooth engagement will be correct.
Bore diameter varies by tooth count and is not a fixed value across the range. Please refer to the variant-specific dimension sheet or contact us to confirm the bore size for your selected tooth count before ordering, especially if you need a specific shaft fit.
The sprocket is machined from carbon steel with a natural (uncoated) finish. For dry indoor or lightly oiled environments it performs well. For outdoor, wet, or chemically aggressive environments, we recommend applying a chain lubricant regularly or considering a stainless steel alternative. The matched 08B roller chain options in this listing are also carbon steel and benefit from the same lubrication practice.
Yes. The intensified (heavy-duty) 08B roller chain shares the same 12.7 mm pitch and roller dimensions as standard 08B chain, so it is fully compatible with all 08B sprockets in this listing. The intensified chain has thicker link plates for higher tensile load capacity — useful in high-shock or heavy-load applications.
The Full Buckle (08B - Full Buckle-4PCS) is a complete connecting link set including the outer plate, pin, and spring clip — everything needed to join two chain ends. The Half Buckle (08B - Half Buckle-2PCS) includes only the inner link components. Choose the Full Buckle when assembling a new chain loop; the Half Buckle is typically used as a spare inner link for repairs.
A basic two-shaft chain drive requires a minimum of two sprockets — one on the drive shaft (motor side) and one on the driven shaft (output side) — plus a length of roller chain to connect them. Use the multi-pack options (2, 3, or 5 pcs) if you are building multiple identical drive stages or need spares for maintenance stock.
