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When a slipping or worn sprocket brings your conveyor, go-kart, mini-bike, or small machinery to a halt, finding an exact-fit replacement in the right tooth count and bore diameter is the real challenge. These 04C drive sprockets are engineered for makers, hobbyists, and maintenance technicians who need a dimensionally accurate, drop-in solution for standard #04C (1/4" pitch) roller chain systems.
Each sprocket is machined from 45# carbon steel, offering a solid balance of hardness and machinability. The pitch is 6.35mm (1/4"), conforming to the ISO 04C / ANSI 25 chain standard. Tooth counts range from 10T to 30T, and bore diameters span 5mm to 16mm (~0.197" to 0.630"), covering the most common shaft sizes used in light-duty drivetrain applications.
Typical use cases include go-kart and mini-bike final drive replacement, small conveyor and feeder mechanism upgrades, robotics and automation prototype builds requiring a compact 04C chain drive sprocket, and DIY power transmission projects where a keyed or plain bore 6.35mm pitch sprocket is specified.
| Chain Standard | ISO 04C / ANSI 25 |
|---|---|
| Pitch | 6.35mm (1/4") |
| Tooth Count Options | 10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 28T, 30T |
| Bore Diameter Options | 5mm, 6mm, 7mm, 8mm, 10mm, 12mm, 14mm, 15mm, 16mm |
| Material | 45# Carbon Steel |
| Surface Finish | See variant options |
| Hub Style | See variant options |
| Keyway | Plain bore (field-machinable) |
| Overall Diameter | See variant options |
| Hub Length | See variant options |
| Quantity per Order | 1 piece |
| Application | Go-kart, mini-bike, conveyor, robotics, light machinery |
The tooth count determines your drive ratio. Divide the driven sprocket teeth by the driver sprocket teeth to get the reduction ratio. For example, a 10T driver paired with a 30T driven sprocket gives a 3:1 reduction — tripling torque while reducing speed by two-thirds. Match your required output speed and torque to select the correct combination.
Measure your shaft diameter with a caliper and select the matching bore size. Available bores are 5, 6, 7, 8, 10, 12, 14, 15, and 16mm. If your shaft is imperial (e.g., 3/8" = 9.525mm), choose the nearest metric bore and plan to machine a keyway or use a set-screw collar for a secure fit.
Yes. The ISO 04C standard and ANSI 25 standard both specify a 6.35mm (1/4") pitch, making these sprockets dimensionally interchangeable with any compliant #25 or #04C roller chain. Always verify the chain's inner width and roller diameter match the sprocket tooth profile before installation.
45# carbon steel (equivalent to SAE 1045) has a typical tensile strength of approximately 600–700 MPa in the as-machined condition. It is well-suited for light-to-medium duty cycling loads such as go-karts, small conveyors, and robotics. For heavy-duty industrial applications with shock loads, consider a hardened or alloy steel sprocket.
45# carbon steel has moderate corrosion resistance. For outdoor or humid environments, apply a light coat of chain lubricant or anti-rust spray to the sprocket surface. If long-term corrosion resistance is critical, consider a zinc-plated or stainless steel alternative for your application.
Yes. The plain bore design is intentionally left unfinished to allow field machining. A standard broach or CNC mill can cut a keyway to your required DIN or ANSI key specification. Ensure the hub wall thickness is sufficient for your keyway depth before machining — refer to the hub dimensions for your selected tooth count.
The pitch circle diameter (PCD) for a 04C sprocket is calculated as: PCD = Pitch ÷ sin(180° ÷ T), where Pitch = 6.35mm and T = number of teeth. For example, a 20T sprocket has a PCD of approximately 6.35 ÷ sin(9°) ≈ 40.6mm (~1.60"). Use this formula to verify clearance in your assembly before ordering.
