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When a worn or undersized sprocket causes chain skipping, premature wear, or drive failure, finding an exact-fit replacement becomes critical. The 04C9T is a 9-tooth drive sprocket engineered specifically for #25 (1/4" pitch) roller chain, making it a dependable choice for hobbyists, makers, and repair technicians who need a drop-in solution without custom machining.
This sprocket features a 6.35 mm (0.25 in) chain pitch and a 9-tooth profile. The bore diameter and hub dimensions are sized to suit compact drive assemblies. The body is typically machined from carbon steel, offering a balance of toughness and machinability suitable for light-to-medium duty applications. Refer to variant options for bore size and any keyway specifications.
Typical use cases include small go-kart and mini-bike final drives, compact conveyor and indexing systems, and DIY motorized project builds where a #25 roller chain drive sprocket replacement is needed. Long-tail applications include "04C9T sprocket replacement," "#25 chain 9 tooth sprocket," and "6.35mm pitch drive sprocket for go-kart."
9-tooth profile with 6.35 mm pitch matches standard #25 / 04C roller chain geometry for smooth, low-noise engagement.
Machined from carbon steel for solid load-bearing capacity in light-to-medium duty drive applications.
Small tooth count enables higher speed ratios when paired with a larger driven sprocket — ideal for motorized DIY builds and go-kart drives.
Dimensionally consistent with the 04C9T standard, allowing direct substitution without shaft modification in most setups.
Surface treatment helps resist oxidation during storage and operation in moderately humid environments.
Available in single-piece or multi-pack quantities to suit one-off repairs or small production runs.
| Part Number | 04C9T |
|---|---|
| Chain Standard | #25 / 04C Roller Chain |
| Number of Teeth | 9 |
| Chain Pitch | 6.35 mm (0.25 in) |
| Bore Diameter | See variant options |
| Hub Style | See variant options |
| Keyway | See variant options |
| Material | Carbon Steel |
| Finish | See variant options |
| Pitch Diameter | Approx. 18.2 mm (0.72 in) |
| Outside Diameter | Approx. 20–22 mm (0.79–0.87 in) |
| Compatible Chain | #25 (1/4" pitch) Roller Chain |
This sprocket is designed for standard #25 roller chain with a 6.35 mm (1/4") pitch. Measure your existing chain's pitch — the distance between the centers of two adjacent pins. If it measures 6.35 mm, this sprocket is chain-compatible. You also need to confirm the bore diameter matches your shaft diameter before ordering.
Bore diameter options vary by variant. Please select your required bore size from the variant options above. If you need a custom bore, contact us to confirm availability before purchasing.
Yes, for light-to-medium duty applications such as go-karts, mini-bikes, and small motorized vehicles, a carbon steel 9-tooth #25 sprocket is a standard choice. Ensure your chain tension and alignment are correct to maximize service life. For heavy-duty or high-RPM industrial use, consult a drive engineer for load calculations.
The sprocket has a surface finish that provides moderate corrosion resistance for typical indoor or sheltered outdoor use. For wet or highly corrosive environments, we recommend applying chain lubricant regularly and considering a stainless steel or zinc-plated alternative if available in your size.
#25H heavy chain shares the same 6.35 mm pitch as standard #25 chain, so the tooth profile is compatible. However, #25H chain has thicker side plates, so verify there is adequate clearance between the sprocket hub and the chain plates before running under load.
Drive ratio = driven sprocket teeth ÷ drive sprocket teeth. A 9-tooth drive sprocket paired with an 18-tooth driven sprocket gives a 2:1 reduction — the output shaft turns at half the input speed with twice the torque. For higher speed reduction, pair this 9T sprocket with a larger driven sprocket. For less reduction, use a driven sprocket closer in tooth count.
Keyway and set screw availability depend on the specific variant. Please check the variant options or contact us to confirm the hub configuration before ordering if your application requires a keyed bore.
