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When a worn or undersized sprocket causes chain skip, vibration, or premature wear on your drive system, the fix starts with the right replacement. These 10A roller chain sprockets are engineered for makers, machine builders, and maintenance professionals who need a dimensionally accurate, drop-in solution for 5/8" (15.875 mm) pitch roller chain applications.
Each sprocket is machined from 45# medium-carbon steel, offering a solid balance of toughness and machinability. Tooth counts range from 10T to 20T, and bore sizes span 12 mm to 40 mm (approximately 0.47" to 1.57"), with matching keyways from 4 mm to 12 mm to ensure positive shaft engagement without slippage. Hub dimensions vary by tooth count — see variant options for exact hub OD and length.
Typical use cases include conveyor drive systems requiring a 10A sprocket replacement, DIY gearbox and power transmission builds using standard ANSI 50 chain, and agricultural or industrial machinery maintenance where keywayed bore sprockets on 5/8" pitch chain are specified.
Machined from 45# steel for reliable strength and wear resistance across standard industrial and DIY drive applications.
Eleven tooth count options let you dial in the exact gear ratio your conveyor, drive shaft, or machinery requires.
Fifteen bore sizes with matched keyways (4–12 mm) ensure positive, slip-free shaft engagement on a wide range of shaft diameters.
Designed specifically for 5/8" pitch (15.875 mm) roller chain — the most common pitch in light-to-medium industrial drives.
Fits conveyor head/tail shafts, gearbox output shafts, and custom power transmission assemblies where a keywayed sprocket is required.
Order exactly the quantity you need. Each listing is for one sprocket; select your tooth count and bore size from the variant options above.
| Chain Standard | ANSI 50 / ISO 10A |
|---|---|
| Chain Pitch | 5/8" (15.875 mm) |
| Tooth Count (Type) | 10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T |
| Bore Diameter | 12 mm – 40 mm (see variant options) |
| Keyway Width | 4 mm – 12 mm (matched to bore; see variant options) |
| Material | 45# Medium-Carbon Steel |
| Surface Finish | See variant options |
| Hub OD | See variant options |
| Hub Length | See variant options |
| Overall Sprocket OD | See variant options |
| Quantity per Order | 1 piece |
This sprocket is designed for ANSI 50 / ISO 10A roller chain with a 5/8" (15.875 mm) pitch. Measure the distance between the centers of three consecutive chain pins and divide by two — if the result is 5/8" (15.875 mm), this sprocket is compatible. Do not use with 40, 60, or other pitch chains.
Measure your shaft diameter with a caliper. Choose the bore size that matches your shaft exactly — for example, a 20 mm shaft requires the "Bore 20 Keyway 6" variant. The keyway width is pre-cut to the standard DIN 6885 dimension for that bore size, so a standard key stock will fit without modification.
Tooth count determines your drive ratio. A smaller sprocket on the drive shaft paired with a larger sprocket on the driven shaft reduces speed and increases torque. For most light conveyor and machinery applications, 10T–15T driver sprockets are common. If you are replacing an existing sprocket, match the tooth count exactly to maintain your current speed ratio.
45# medium-carbon steel (equivalent to SAE 1045) provides a tensile strength of approximately 600–800 MPa in the normalized condition, making it suitable for light-to-medium duty industrial drives, conveyors, and machinery. For heavy shock-load or high-speed applications, consider whether a hardened or alloy steel sprocket is more appropriate for your specific load requirements.
No additional machining is required for standard installations. The bore is finish-machined to the specified diameter and the keyway is pre-cut. Simply slide the sprocket onto your shaft, insert a standard key, and secure with a setscrew or retaining ring as appropriate for your assembly. If your shaft has a non-standard diameter, contact us before ordering.
45# steel is not inherently corrosion-resistant. For outdoor or wet environments, we recommend applying a rust-inhibiting lubricant or grease to the sprocket and chain regularly. If your application involves continuous moisture exposure, consider a stainless steel or zinc-plated alternative, or implement a sealed chain guard to protect the drive.
Chain speed (in meters per minute) equals: Tooth Count × Chain Pitch × Shaft RPM. A 10-tooth sprocket at 100 RPM moves the chain at 10 × 0.015875 m × 100 = 15.875 m/min. A 20-tooth sprocket at the same RPM doubles the chain speed to 31.75 m/min. Matching your tooth count to your required output speed and torque is essential for efficient drive design.
