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When a worn or undersized sprocket causes chain skip, premature wear, or unexpected downtime on your conveyor, go-kart, mini bike, or industrial drive system, finding an exact-match replacement becomes urgent. These 5/8" pitch (ANSI #50 / 10A) roller chain sprockets are engineered for makers, repair technicians, and mechanical hobbyists who need a dimensionally accurate, drop-in solution without custom machining.
Each sprocket is machined from 45# medium-carbon steel, offering a solid balance of hardness and toughness. The rough bore diameter ranges from 12 mm (0.47") to 16 mm (0.63"), ready for finish boring or keywaying to your shaft size. Tooth counts span 10T through 29T, covering a wide range of speed-ratio requirements. A matching 1.5 m roller chain, chain links, and half links are also available as companion variants.
Typical use cases include go-kart and mini bike final-drive replacement, small conveyor and feeder drive upgrades, agricultural equipment repair requiring #50 chain sprockets, and DIY power-transmission builds where a 5/8" pitch roller chain sprocket with a rough bore is the starting point for a custom shaft fit.
| Chain Standard | ANSI #50 / ISO 10A |
|---|---|
| Chain Pitch | 5/8" (15.875 mm) |
| Pitch Designation | 10A |
| Tooth Count Options | 10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 29T |
| Pitch Diameter (10T) | 17.875 mm (0.703") |
| Rough Bore Diameter | 12 mm / 14 mm / 16 mm (see variant options) |
| Material | 45# Medium-Carbon Steel |
| Surface Finish | See variant options |
| Companion Chain Length | 1.5 m (roller chain variant) |
| Chain Link Pack | 3 pcs (chain link variant) / 2 pcs (half link variant) |
| Chain Link Width | 5/8" (matches #50 chain) |
| Weight | See variant options |
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 20T driven sprocket gives a 2:1 reduction — the output shaft turns at half the speed with twice the torque. Match your required speed ratio and chain wrap angle to select the correct tooth count from the 10T–29T range available.
These sprockets are designed for ANSI #50 / ISO 10A roller chain with a 5/8" (15.875 mm) pitch. Do not use with #40 (1/2" pitch) or #60 (3/4" pitch) chain — the tooth profile and pitch diameter will not match, causing rapid wear or chain derailment.
"Rough bore" means the center hole is pre-drilled to a nominal diameter (12 mm, 14 mm, or 16 mm) but is not finish-machined to a precise tolerance or fitted with a keyway. You can use it as-is on a shaft that is slightly smaller than the bore with a set-screw hub, or take it to a machine shop for finish boring, reaming, and keyway cutting to achieve a precision fit.
45# medium-carbon steel (equivalent to SAE 1045) offers a tensile strength of approximately 600–700 MPa in the as-machined condition. It provides good tooth wear resistance for moderate-duty drives such as go-karts, mini bikes, and light conveyor systems. For heavy-duty industrial applications with shock loads, consider heat-treated or alloy-steel sprockets.
45# carbon steel has limited inherent corrosion resistance. For outdoor or wet environments, apply a chain lubricant regularly and consider a protective coating (paint, cold galvanizing, or clear lacquer) on the sprocket body. The roller chain itself should also be lubricated and inspected periodically to prevent rust-induced elongation.
Yes. Select "Roller Chain" from the Number of Teeth dropdown to order a 1.5 m length of matching #50 roller chain. Choose "Chain Link" for a pack of 3 standard connecting links, or "Half Link" for a pack of 2 half links — useful for fine-tuning chain length when a full link would leave the chain too long.
Count the number of teeth on your existing sprocket and measure the chain pitch (the distance between the centers of two adjacent chain pins). For #50 chain this should measure 5/8" (15.875 mm). Also measure the shaft diameter to select the appropriate rough bore size (12 mm, 14 mm, or 16 mm) that gives you enough material to finish-bore to your shaft OD.
