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When a worn or mismatched sprocket causes chain skip, vibration, or premature wear in your drive system, the entire machine suffers. Engineers, fabricators, and serious DIY builders who rely on #50 (10A) duplex roller chain need a sprocket machined to exact pitch tolerances — not a loose approximation. This 10A duplex chain sprocket is engineered for demanding power-transmission applications where dimensional accuracy and material strength are non-negotiable.
Each sprocket is machined from 45# medium-carbon steel, delivering a strong balance of hardness and toughness suited for cyclic loading. The pitch is precisely 15.875 mm (5/8 in), matching the ISO 10A / ANSI #50 duplex chain standard. Tooth counts range from 11T to 30T, with bore and hub dimensions scaled accordingly across variants — typically featuring bore diameters from approximately 12 mm (0.47 in) on the smallest models up to 40 mm (1.57 in) on the largest, though exact bore dimensions vary by tooth count (see variant options).
Typical use cases include industrial conveyor drives requiring synchronized duplex-strand power transfer, agricultural and light-industrial gearbox output stages where a compact sprocket-and-chain reduction is needed, and custom DIY drivetrain builds — such as go-karts, electric bikes, or workshop machinery — where a reliable 10A duplex sprocket replacement or upgrade is required.
| Chain Standard | ISO 10A / ANSI #50 Duplex |
|---|---|
| Chain Pitch | 15.875 mm (5/8 in) |
| Number of Strands | 2 (Duplex) |
| Tooth Count Range | 11T – 30T (see variant options) |
| Material | 45# Medium-Carbon Steel |
| Bore Diameter | See variant options |
| Hub Diameter | See variant options |
| Overall Width | See variant options |
| Pitch Diameter Range | Approx. 56 mm – 153 mm (2.2 in – 6.0 in), varies by tooth count |
| Surface Treatment | Oxidation-resistant finish |
| Applicable Chain | #50 / 10A Duplex Roller Chain |
| Quantity per Order | 1 Pcs |
Select your tooth count based on your required speed ratio. Divide the driver sprocket teeth by the driven sprocket teeth to get your reduction ratio. For example, a 15T driver paired with a 30T driven sprocket gives a 2:1 reduction, halving output speed while doubling torque. If you are replacing an existing sprocket, match the tooth count on the worn part exactly.
Yes — provided your chain is a standard ISO 10A / ANSI #50 duplex (two-strand) roller chain with a 15.875 mm pitch. These sprockets are not compatible with simplex (single-strand) #50 chain or with chains of a different pitch. If you are unsure, measure your chain's pitch (pin center to pin center) and count the strands before ordering.
Bore diameter varies by tooth count — please check the variant detail page or contact us to confirm the bore for your selected model. The 45# steel construction is machinable, so a qualified machine shop can re-bore and keyway the hub to match your shaft diameter if the stock bore is smaller than needed. Do not bore beyond the maximum recommended bore for each tooth count, as this reduces hub wall thickness and load capacity.
45# medium-carbon steel has a typical tensile strength of approximately 600–800 MPa after standard heat treatment. For continuous-duty applications, size your sprocket selection using the chain manufacturer's rated working load for #50 duplex chain and apply an appropriate service factor for shock or variable loads. Contact us if you need load-rating data for a specific tooth count.
The surface finish provides basic oxidation resistance suitable for typical indoor workshop and light-industrial environments. For outdoor, washdown, or high-humidity applications, we recommend applying a chain lubricant or anti-corrosion coating regularly, or considering stainless-steel alternatives. Contact us to confirm suitability for your specific environment.
In most cases, yes. The tooth profile conforms to ISO 606 / ANSI B29.1 standards, making these sprockets dimensionally interchangeable with OEM 10A duplex sprockets of the same tooth count. Always verify the bore diameter and hub width against your original part before installation to ensure a proper fit on your shaft and within your drive housing.
A simplex sprocket is designed for a single-strand roller chain, while a duplex sprocket has a wider hub and tooth geometry to engage two parallel chain strands simultaneously. Duplex configurations roughly double the load-carrying capacity of the drive compared to a simplex setup of the same pitch and tooth count, making them preferred for higher-torque or higher-reliability applications.
