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When a single-row sprocket just can't handle the load, engineers and makers reach for a double-row solution. Whether you're building a heavy-duty conveyor, a go-kart drivetrain, or an industrial power-transmission system, mismatched or worn sprockets cause chain skip, premature wear, and costly downtime. These #40 double row chain sprockets are engineered to deliver smooth, reliable torque transfer across a wide tooth range — from compact 10-tooth drive pinions to large 60-tooth driven wheels.
Each sprocket is machined to suit #40 (08B) roller chain with a 12.7mm (0.500 in) pitch. The double-row tooth profile accommodates duplex #40 chain, providing roughly twice the load capacity of a single-strand setup. Tooth counts span 10T through 60T, covering a broad gear-ratio range in a single product family. Hub bore and keyway dimensions vary by tooth count — see variant options for exact bore specifications.
Typical applications include go-kart and mini-bike final drives requiring a compact #40 duplex sprocket, conveyor and material-handling systems where a double-strand roller chain sprocket reduces chain tension, and light industrial machinery such as packaging equipment, agricultural implements, and power-transmission assemblies that demand a reliable 12.7mm pitch sprocket with high tooth-count options.
| Chain Standard | ANSI #40 / ISO 08B |
|---|---|
| Chain Type | Duplex (Double Row) Roller Chain |
| Pitch | 12.7mm (0.500 in) |
| Number of Teeth | 10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 30T, 34T, 35T, 36T, 37T, 38T, 39T, 40T, 41T, 43T, 45T, 46T, 48T, 50T, 55T, 60T |
| Bore Diameter | See variant options |
| Hub Diameter | See variant options |
| Overall Width | See variant options |
| Keyway | See variant options |
| Surface Treatment | Oxidation-resistant protective finish |
| Pack Quantity | 1 PCS per order |
| Application | Go-karts, conveyors, industrial power transmission, agricultural machinery |
The tooth count determines your drive ratio. Divide the driven sprocket teeth by the drive sprocket teeth to get the reduction ratio. For example, a 10T drive sprocket paired with a 40T driven sprocket gives a 4:1 reduction. Select a smaller tooth count on the drive side for more torque, or a larger count for higher speed. If you're replacing an existing sprocket, match the tooth count exactly to maintain your current ratio.
This sprocket is designed for #40 / 08B duplex roller chain. Both designations refer to the same 12.7mm (0.500 in) pitch standard — #40 is the ANSI designation used in North America, while 08B is the ISO designation common in Europe. Either chain will fit these sprockets correctly as long as it is the duplex (double-strand) version.
A double-row sprocket is used with duplex roller chain to transmit higher loads than a single-strand setup of the same pitch. By running two parallel strands of chain simultaneously, the system roughly doubles the tensile load capacity and distributes stress more evenly across the drive. This is especially valuable in go-kart final drives, heavy conveyor systems, and industrial machinery where a single #40 chain would be undersized.
The bore diameter varies by tooth count. Many variants ship with a pilot bore that can be machined to your exact shaft diameter and keyway dimensions by a local machine shop. Some variants may ship with a finished bore — please check the variant detail or contact us to confirm the bore size before ordering if you need a specific shaft fit.
These sprockets carry a protective surface finish that resists light oxidation in moderately humid, indoor workshop conditions. For prolonged outdoor exposure, wet environments, or washdown applications, we recommend applying a chain lubricant or anti-corrosion coating regularly. For highly corrosive environments, consider stainless steel sprockets instead.
Yes — as long as your existing sprocket is rated for #40 / 08B duplex roller chain with a 12.7mm pitch and the tooth count matches. The tooth profile conforms to ANSI #40 / ISO 08B standards, making it a compatible replacement for most OEM sprockets on conveyors, go-karts, mini-bikes, and light industrial equipment. Verify the bore diameter and hub dimensions match your shaft before installation.
Maximum RPM and load capacity depend on the specific tooth count, bore size, shaft fit, lubrication, and operating conditions. As a general guideline, #40 duplex roller chain drives are rated for moderate-speed, moderate-to-high torque applications. For precise load ratings, refer to the ANSI #40 chain manufacturer's power rating tables and match them to your selected tooth count. Contact us if you need application-specific guidance.
