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When a worn or undersized sprocket is causing chain skip, uneven wear, or drivetrain noise, the fix starts with a correctly matched replacement. This 06B-1 pilot bore sprocket is designed for makers, machine builders, and mechanical engineers who need a reliable simplex roller chain sprocket that can be bored and keyed to exact shaft specifications on-site.
Each sprocket is machined from carbon steel and conforms to the ISO 06B-1 standard with a 3/8" (9.525 mm) pitch. Available in 15, 16, and 17 tooth counts, with pilot bore diameters ranging from 12 mm to 25 mm (approximately 0.47" to 0.98"), including keyway options (15×5 mm, 17×5 mm, and 12×4 mm). Sold individually (1 PCS) or in pairs (2 PCS).
Typical applications include light conveyor systems requiring a 06B simplex sprocket replacement, small agricultural machinery drivetrain builds using 3/8" pitch roller chain, and custom automation rigs where a pilot bore sprocket for 06B-1 chain allows on-site bore finishing to match non-standard shaft diameters.
Manufactured to ISO 06B-1 simplex chain specifications, ensuring dimensional accuracy and direct interchangeability with standard 06B-1 roller chain across industrial and DIY drivetrain applications.
The pilot bore format allows machinists and builders to bore and key the hub to their exact shaft diameter, eliminating the need for custom-ordered sprockets and reducing lead time significantly.
Machined from carbon steel for solid load-bearing capacity and wear resistance under continuous chain engagement, suitable for both low-speed and moderate-speed drivetrain configurations.
Three tooth count options let you fine-tune your drive ratio without changing chain pitch. Useful when adjusting output speed or torque in conveyor, feeder, or power transmission builds.
Select from plain bore (12–25 mm) or pre-cut keyway bores (15×5 mm, 17×5 mm, 12×4 mm) to match your shaft and key configuration directly, saving machining time in the workshop.
Available in 1 PCS or 2 PCS per order, making it straightforward to source a matched pair for dual-sprocket shaft setups or to keep a spare on hand for maintenance schedules.
| Chain Standard | ISO 06B-1 Simplex |
|---|---|
| Chain Pitch | 3/8" (9.525 mm) |
| Number of Teeth | 15 / 16 / 17 (see variant options) |
| Bore Type | Pilot Bore (plain or keyway) |
| Bore Diameter | 12 mm, 14 mm, 15 mm, 18 mm, 25 mm (plain); 12×4 mm, 15×5 mm, 17×5 mm (keyway) |
| Material | Carbon Steel |
| Finish | See variant options |
| Hub Style | Pilot Bore |
| Quantity per Order | 1 PCS or 2 PCS (see variant options) |
| Outside Diameter | See variant options |
| Hub Diameter | See variant options |
| Weight | See variant options |
The tooth count determines your drive ratio. Divide the driven sprocket teeth by the driver sprocket teeth to get the ratio. For example, a 15-tooth driver paired with a 30-tooth driven sprocket gives a 2:1 reduction. Choose 15T for higher speed output, 16T or 17T for slightly more torque at the same input speed. Always match the chain pitch (06B-1, 3/8") on both sprockets.
Select the bore diameter that matches your shaft diameter. If your shaft is 12 mm, choose the 12 mm bore option. For shafts requiring a key for positive drive engagement, select the appropriate keyway option (e.g., 15×5 mm keyway for a 15 mm shaft with a 5 mm key slot). If your shaft diameter falls between listed sizes, choose the next smaller bore and have it finish-bored to size by a machinist.
Yes — this sprocket is manufactured to ISO 06B-1 simplex specifications with a 3/8" (9.525 mm) pitch, which is the defining compatibility factor. As long as your roller chain is rated 06B-1 simplex with 3/8" pitch, this sprocket will mesh correctly. Confirm the chain pitch stamped on your chain or in your equipment manual before ordering.
The sprocket is machined from carbon steel, which provides solid tensile strength and wear resistance for typical 06B-1 chain drive loads. For exact load ratings, refer to the ISO 06B-1 standard or contact us with your application's torque and RPM requirements so we can confirm suitability.
Carbon steel has moderate corrosion resistance. For indoor or dry environments, the material performs well with standard lubrication. For outdoor or high-humidity applications, we recommend applying a rust-inhibiting lubricant or chain oil regularly. If your environment requires higher corrosion resistance, contact us to confirm available finish options.
Order 1 PCS if you are replacing a single sprocket or building a single-sprocket shaft setup. Order 2 PCS if your drivetrain uses a matched pair on the same shaft, or if you want to keep a spare for scheduled maintenance. Both pieces in a 2 PCS order are identical in model, tooth count, and bore specification.
No. This is an 06B-1 simplex sprocket designed for single-strand 06B roller chain only. For duplex (two-strand) chain applications, you would need an 06B-2 duplex sprocket. Using a simplex sprocket with duplex chain will result in misalignment and accelerated wear.
