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 is costing you chain life and drivetrain efficiency, the right replacement makes all the difference. Makers, hobbyists, and light-industrial builders working with 04C (1/4" pitch) roller chain systems need a sprocket that holds tight tolerances without demanding a machinist's budget. This 04C roller chain drive sprocket wheel is engineered for that exact use case — delivering reliable power transmission in compact, precision-critical applications.
Each sprocket is machined from 45 carbon steel, offering a balance of hardness and machinability suited to roller chain drive applications. The tooth profile conforms to standard 04C chain geometry with a pitch of 6.35 mm (1/4 in). Available tooth counts range from 9T to 30T, with bore sizes from 5 mm (0.197 in) to 16 mm (0.630 in) to accommodate a wide range of shaft diameters. Outer diameter scales with tooth count — typically 20–65 mm (0.79–2.56 in) depending on the selected variant.
Typical use cases include small robotics and automation platforms requiring compact 04C chain drives, DIY go-kart and mini-bike drivetrain builds using 1/4" pitch chain, and light conveyor or indexing mechanisms where precise tooth engagement and low backlash are critical for repeatable positioning.
Machined from 45 steel for reliable hardness and wear resistance in roller chain drive applications without excessive brittleness.
Tooth profile engineered to 04C (1/4" / 6.35 mm pitch) specifications, ensuring correct engagement with standard 04C roller chain links.
Available bore diameters from 5 mm to 16 mm (0.197"–0.630") to fit a broad range of motor, gearbox, and axle shaft sizes.
Choose from 9 to 30 teeth to dial in your target gear ratio — from high-speed small sprockets to torque-multiplying larger wheels.
Order as a single unit for replacement or prototyping, or select the 5-pack for project builds, spares inventory, or multi-axis setups.
Each sprocket is turned and finished to consistent dimensional tolerances, supporting repeatable chain alignment and reduced drivetrain noise.
| Chain Standard | 04C (ANSI/ISO) |
|---|---|
| Chain Pitch | 6.35 mm (1/4 in) |
| Tooth Count Options | 9T, 10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 29T, 30T |
| Bore Size Options | 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 16 mm |
| Material | 45 Carbon Steel |
| Outer Diameter | See variant options |
| Hub Thickness | See variant options |
| Surface Finish | Machined (natural steel) |
| Quantity per Order | 1 pc or 5 pcs (select above) |
| Weight | See variant options |
The tooth count determines your drive ratio. Divide the driven sprocket teeth by the drive sprocket teeth to get the ratio. For higher speed output, use fewer teeth on the driven sprocket. For more torque, use more teeth. Common small-drive setups pair a 9T–12T drive sprocket with a 20T–30T driven sprocket for a 2:1 to 3:1 reduction.
Measure your shaft diameter with a caliper and select the matching bore size. Available bores are 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, and 16 mm. If your shaft is imperial (e.g., 5/16" ≈ 7.94 mm), select the next available metric bore and use a keyway or set screw to secure the fit, or have the bore machined to exact size.
These sprockets are machined from 45 carbon steel, which provides adequate hardness for light-to-medium duty 04C chain drive applications including robotics, go-karts, mini-bikes, and small conveyors. For heavy-duty industrial applications with continuous high-load cycling, consult the chain manufacturer's rated working load for 04C chain and verify it matches your application requirements.
45 carbon steel has moderate corrosion resistance. For outdoor or humid environments, apply a light machine oil or chain lubricant to the sprocket teeth and bore area regularly. For applications requiring higher corrosion resistance, consider stainless steel alternatives or apply a protective coating after installation.
Yes — this sprocket is machined to standard 04C (6.35 mm pitch) geometry and is compatible with any 04C-compliant roller chain regardless of brand, as long as the chain conforms to the 04C standard. Always verify chain pitch before ordering. Do not use with 25H, 35, or other non-04C chain standards.
The bore is a plain round bore without a pre-cut keyway or set screw hole. For light-duty or prototype applications, a friction fit or external clamping collar may be sufficient. For power transmission applications, we recommend having a machinist add a keyway or set screw tapped hole to match your shaft configuration.
The 1 pc option is ideal for single-axis builds, replacements, or prototyping. The 5-pack offers a per-unit cost saving and is suited for multi-axis machines, production builds, or keeping spares on hand. Both options ship the same sprocket — only the quantity differs.
