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When a worn or mismatched sprocket is costing you chain life and drive efficiency, the right replacement makes all the difference. Makers, fabricators, and mechanical hobbyists working with 08B roller chain systems need a sprocket that holds tight tolerances without demanding custom machining — and that's exactly what this flat pilot sprocket delivers.
This sprocket is machined to suit standard 08B roller chain with a 9.52mm (3/8 in) pitch. The flat pilot bore design accepts a range of shaft diameters after simple boring or keying to your specification. Available in 10 through 30 tooth counts, with tooth profiles conforming to ISO 606 / BS 228 standards. Tooth widths and pitch circle diameters scale proportionally across the range — from approximately 36mm PCD on the 10T up to approximately 91mm PCD on the 30T.
Typical use cases include small conveyor drive systems requiring a compact 08B sprocket replacement, go-kart and mini-bike rear axle drive setups using 9.52mm pitch chain, and DIY automation rigs, rotary indexers, or chain-driven workshop equipment where a flat pilot sprocket for 08B chain simplifies shaft fitment.
Tooth geometry conforms to international roller chain standards, ensuring smooth engagement and even load distribution across the full 10–30T range.
Unfinished pilot bore allows you to machine the bore and keyway to your exact shaft diameter — no adapter bushings required for a clean, direct fit.
Choose from 21 tooth counts to dial in your drive ratio precisely. Pair different tooth counts on driver and driven shafts to achieve the speed reduction or increase your application needs.
All variants are machined to the same 9.52mm (3/8 in) chain pitch, so you can mix tooth counts across a single drive system without changing chain type.
Dimensioned for 08B chain load ratings — appropriate for conveyor drives, go-kart axles, rotary indexers, and similar low-to-moderate torque applications.
Available in 1, 2, 3, 5, or 10-piece packs so you can order exactly what your project or maintenance stock requires without over-buying.
| Chain Standard | 08B / ISO 606 / BS 228 |
|---|---|
| Chain Pitch | 9.52mm (3/8 in) |
| Tooth Count Range | 10T – 30T (21 variants) |
| Bore Type | Flat pilot bore (finish to suit shaft) |
| Pilot Bore Diameter | See variant options |
| Pitch Circle Diameter (PCD) | See variant options |
| Hub Diameter | See variant options |
| Hub Length / Width | See variant options |
| Material | See variant options |
| Finish | See variant options |
| Pack Quantity | 1 / 2 / 3 / 5 / 10 Pcs |
| Application | Conveyor, go-kart, rotary drive, DIY automation |
Divide the driven sprocket tooth count by the driver sprocket tooth count to get your reduction ratio. For example, a 10T driver paired with a 30T driven sprocket gives a 3:1 speed reduction. Select your tooth counts based on the input and output speeds your application requires.
This sprocket is designed for standard 08B roller chain conforming to ISO 606 and BS 228, with a 9.52mm (3/8 in) pitch. It is not compatible with ANSI #40 chain, which shares a similar pitch but has different roller and plate dimensions.
A flat pilot bore means the sprocket ships with a small-diameter through-hole (the pilot bore). You or a machinist then bore it out to your exact shaft diameter and cut a keyway if needed. This approach gives you a precise, custom fit without requiring a separate taper-lock bush.
These sprockets are rated for 08B chain load capacity, which covers light-to-medium duty drives including go-kart rear axles, small conveyor systems, and rotary indexers. For heavy industrial drives or high-shock load applications, consult the 08B chain's rated working load and confirm it matches your torque requirements before ordering.
The corrosion resistance depends on the material and finish of the specific variant — please check the variant details or contact us to confirm. For outdoor or wet environments, we recommend applying a chain lubricant regularly and considering a sprocket with a protective coating or stainless material if available.
Yes. All variants in this listing share the same 9.52mm chain pitch, so you can freely mix any two tooth counts (e.g., 10T driver + 20T driven) on a single 08B chain run. Just ensure your center distance and chain length are adjusted accordingly.
If you are building a single drive system, a 1 or 2-piece pack is usually sufficient. For workshop stock, maintenance spares, or multi-axis machines using the same sprocket size, the 5 or 10-piece packs offer a lower per-unit cost. Select your quantity in the Amount option above before adding to cart.
