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When a worn or undersized sprocket causes chain skip, premature wear, or drive failure, the entire project stalls. Whether you are a maker rebuilding a go-kart, a technician maintaining a conveyor line, or a hobbyist assembling a custom power-transmission system, you need a sprocket that fits precisely and holds up under load.
These 12A roller chain sprockets are machined from carbon steel and are available in tooth counts ranging from 12T to 40T. The 12A designation corresponds to a 19.05 mm (¾ inch) pitch, matching the widely used #60 ANSI / ISO 12A roller chain standard. Bore sizes vary by tooth count — see variant options for exact bore dimensions.
Typical applications include go-kart and mini-bike final drives, agricultural equipment chain drives, light industrial conveyor systems, and custom CNC or robotics power-transmission builds requiring a 19.05 mm pitch roller chain sprocket replacement.
Machined to match the ANSI #60 / ISO 12A standard exactly, ensuring smooth chain engagement and minimal vibration across the full tooth range from 12T to 40T.
Manufactured from carbon steel for a strong strength-to-weight ratio, capable of handling the torque demands of go-karts, conveyors, and light industrial drives.
Available from 12T up to 40T in a single product listing, letting you dial in the exact gear ratio your drive system requires without sourcing from multiple suppliers.
Each sprocket is bored to close tolerances so it seats securely on the shaft. Bore diameter varies by tooth count — select your variant to confirm the exact bore size.
Dimensionally compatible with OEM and aftermarket 12A sprockets, making these a straightforward drop-in replacement for worn or damaged drive sprockets in existing assemblies.
Suited for go-karts, mini-bikes, agricultural machinery, conveyor systems, and custom robotics or CNC builds — anywhere a 19.05 mm pitch roller chain drive is used.
| Chain Standard | ANSI #60 / ISO 12A |
|---|---|
| Chain Pitch | 19.05 mm (¾ in) |
| Tooth Count Range | 12T – 40T (see variant options) |
| Material | Carbon Steel |
| Bore Diameter | See variant options |
| Hub Style | See variant options |
| Outer Diameter | See variant options |
| Surface Finish | See variant options |
| Applicable Chain Width | Typically 9.5 – 12.7 mm inner width (standard #60 chain) |
| Mounting | Keyed bore or plain bore — see variant options |
The tooth count determines your drive ratio. Divide the driven sprocket teeth by the drive sprocket teeth to get the reduction ratio. For go-karts, a common setup pairs a small drive sprocket (12T–14T) with a larger driven sprocket (60T–72T). For conveyor or industrial use, match the ratio to your required output speed and torque. Select your tooth count from the variant options above.
These sprockets are designed for ANSI #60 / ISO 12A roller chain with a 19.05 mm (¾ inch) pitch. Do not use with #50 (15.875 mm pitch) or #80 (25.4 mm pitch) chain — the pitch must match exactly for safe and reliable operation.
Measure your shaft diameter with a caliper. Each tooth-count variant has a specific bore diameter listed in the variant details. If your shaft requires a custom bore, a local machine shop can bore the sprocket to size after purchase. Always confirm the bore dimension in the variant options before ordering.
Carbon steel offers a solid balance of tensile strength and machinability, making it well-suited for go-karts, light industrial conveyors, and agricultural equipment operating under moderate to heavy loads. For highly corrosive environments (salt water, chemical exposure), consider adding a protective coating or consult us about stainless options.
Carbon steel can oxidize when exposed to moisture over time. For outdoor or wet environments, apply a chain lubricant regularly and consider a rust-inhibiting spray coating on the sprocket body. Keeping the chain properly lubricated also significantly extends sprocket life by reducing metal-to-metal contact.
Yes — these sprockets are dimensionally compatible with standard ANSI #60 / ISO 12A sprockets. Match the tooth count and bore diameter of your existing sprocket, and this will fit as a drop-in replacement. If your old sprocket has a keyway, confirm the keyway dimensions in the variant details or contact us to confirm compatibility.
It is strongly recommended. A worn chain will accelerate wear on a new sprocket because the stretched chain pitch no longer matches the sprocket tooth geometry precisely. Replacing both together ensures even load distribution, quieter operation, and a longer service life for the entire drive system.
