Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a worn or mismatched sprocket causes chain skip, premature wear, or unexpected downtime, the entire drivetrain suffers. Whether you're a maker building a custom go-kart, a workshop technician maintaining conveyor equipment, or a DIY enthusiast assembling a motorized project, you need a sprocket that meshes cleanly with your 05B roller chain every single time.
These 05B chain drive sprockets are machined from 45# medium-carbon steel, delivering a solid balance of hardness and toughness. The tooth profile is cut to match the ISO 05B standard with an 8mm (5/16 in) pitch. Available tooth counts range from 10T to 28T, covering a bore diameter range typically from 8mm to 25mm (approx. 0.31–0.98 in) depending on the selected variant. A matching 5-meter roller chain option is also available for complete drivetrain builds.
Typical applications include go-kart and mini-bike chain drives, light-duty conveyor systems, agricultural machinery attachments, and custom motorized DIY builds requiring a compact 05B pitch sprocket for speed reduction or torque multiplication.
| Chain Standard | ISO 05B |
|---|---|
| Chain Pitch | 8mm (5/16 in) |
| Number of Teeth | 10T / 11T / 12T / 13T / 15T / 16T / 17T / 18T / 19T / 20T / 21T / 22T / 23T / 24T / 25T / 26T / 28T |
| Material | 45# Medium-Carbon Steel |
| Bore Diameter | See variant options |
| Hub Diameter | See variant options |
| Overall Thickness | See variant options |
| Surface Finish | Oxidation-resistant protective coating |
| Hardness | Typically HRC 40–50 (tooth surface) |
| Roller Chain Option | 05B Roller Chain, 5 Meter length |
| Available Quantities | 1 pcs (sprocket) / 5 Meter (roller chain) |
| Application | Go-karts, conveyors, agricultural equipment, DIY motorized builds |
The tooth count determines your gear 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 20T driven sprocket gives a 2:1 reduction — doubling torque while halving speed. Use a smaller tooth count on the drive side for more torque, or a larger count for higher output speed.
Yes — provided your chain conforms to the ISO 05B standard with an 8mm (5/16 in) pitch. Verify your chain's pitch marking before ordering. These sprockets are not compatible with #25, #35, or other pitch chains even if the tooth count matches.
Bore diameter varies by tooth count and is listed in the variant options. If you need a specific bore size to match your shaft diameter, please check the variant details or contact us to confirm before ordering. Machining to a custom bore is not included.
45# medium-carbon steel has a typical tensile strength of 600–800 MPa and is widely used in mechanical power transmission components. It handles sustained moderate loads well. For very high-shock or heavy-industrial applications, consider whether a hardened alloy steel sprocket may be more appropriate for your duty cycle.
The sprockets carry a protective surface finish that resists light oxidation in typical workshop and sheltered outdoor environments. For prolonged exposure to moisture, salt spray, or chemicals, we recommend applying a chain lubricant or anti-rust coating as part of your regular maintenance routine.
Yes. Select the "Roller Chain / 5 Meter" variant option to add a 5-meter length of matching 05B roller chain to your order. This is ideal when building a new drivetrain from scratch and ensures chain-to-sprocket pitch compatibility right out of the box.
These sprockets are designed for shaft mounting via a machined bore. Depending on the variant, the bore may accept a key and keyway or a set screw for shaft retention. Confirm the bore style for your selected tooth count in the variant details, and ensure your shaft diameter matches before installation.
