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When a worn or undersized sprocket causes chain skip, premature wear, or misalignment in your drive system, the fix starts with a correctly matched wheel. Whether you are building a go-kart drivetrain, retrofitting a conveyor, or replacing a worn component on a mini-bike or small engine application, the right tooth count and pitch are non-negotiable. This #40 flat chain drive sprocket is engineered for makers, fabricators, and mechanical hobbyists who need a reliable, drop-in replacement or new-build component without guesswork.
Each sprocket is machined to ANSI #40 / ISO 08B chain standards with a pitch of 1/2" (12.7 mm). The flat-plate hub design keeps the profile compact and the bore concentric. Available in 10T through 37T configurations, outer diameter scales from approximately 42 mm (1.65 in) at 10T to approximately 150 mm (5.91 in) at 37T. Bore diameter and keyway dimensions vary by tooth count — see variant options for exact bore specs.
Typical use cases include go-kart and mini-bike final-drive replacement, small conveyor and feeder drive systems, DIY robotics and automation chain loops, and light agricultural equipment sprocket swaps. Long-tail search terms that describe this product: #40 chain sprocket 10 tooth replacement, 08B roller chain drive wheel 37T, 12.7mm pitch flat sprocket for go-kart.
Machined to both ANSI #40 and ISO 08B chain pitch specifications, ensuring interchangeability across North American and metric roller chain systems without adapters.
Twenty-eight tooth-count options in a single product listing let you dial in your exact gear ratio — from fast, low-torque 10T configurations to high-torque 37T setups — all sharing the same 1/2" pitch.
The flat (non-flanged) hub keeps axial clearance minimal and simplifies alignment on shafts where a stepped or flanged hub would interfere with adjacent components or frame rails.
Each sprocket receives a protective surface finish to resist oxidation in workshop and light outdoor environments, extending service life between maintenance intervals.
Precision-bored center hole ensures the sprocket runs true on the shaft, reducing vibration, chain side-load, and bearing wear — critical for high-cycle or high-speed drive applications.
Tooth profile follows standard ANSI #40 involute geometry, making these sprockets direct replacements for OEM wheels on go-karts, mini-bikes, conveyors, and small engine equipment without chain modification.
| Chain Standard | ANSI #40 / ISO 08B |
|---|---|
| Pitch | 1/2" (12.7 mm) |
| Tooth Count Range | 10T – 37T (select variant) |
| Hub Style | Flat plate (no flange) |
| Outer Diameter | See variant options |
| Bore Diameter | See variant options |
| Keyway | See variant options |
| Material | Carbon steel |
| Surface Finish | Oxidation-resistant protective coating |
| Tooth Profile | ANSI #40 standard involute |
| Weight | See variant options |
| Mounting | Set screw or interference fit (see variant options) |
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 37T driven sprocket gives a 3.7:1 reduction — more torque, less speed. For go-karts, a 10T–12T driver with a 60T–72T rear wheel sprocket is common. For conveyors, match the existing tooth count on the shaft you are replacing.
Yes. Any sprocket in this listing is machined to ANSI #40 / ISO 08B pitch (1/2" / 12.7 mm). As long as your chain is stamped or rated #40 or 08B, the tooth engagement will be correct. If you are unsure, measure the distance between three consecutive chain pins — it should be 25.4 mm (1.00") for two pitches.
Bore diameter increases with tooth count to maintain structural integrity at larger diameters. Exact bore dimensions are listed in the variant detail page for each tooth count. If you need a specific bore size that does not match a listed variant, contact us to confirm availability of custom-bored options.
These sprockets are manufactured from carbon steel and are suitable for the torque and speed loads typical of recreational go-karts and mini-bikes running #40 chain. For racing applications with sustained high RPM or shock loads, verify the bore and set-screw engagement against your shaft diameter and engine output before ordering.
The sprocket ships with a protective surface coating. For extended outdoor or humid-environment use, apply a light coat of chain lubricant or anti-rust spray to all exposed surfaces. Regular chain lubrication also protects the tooth flanks from corrosive wear. Avoid prolonged submersion in water or exposure to salt spray without additional protective treatment.
Yes. ANSI #40 and ISO 08B share the same 12.7 mm pitch and are functionally interchangeable in most drive configurations. The roller diameter and inner link plate dimensions are nearly identical, so an 08B chain will seat correctly on these #40-spec sprocket teeth.
A flat (plate-hub) sprocket has a uniform thickness across the hub and tooth area with no raised collar. This keeps the overall width narrow and is ideal when axial space is limited or when the chain is guided by other means. A flanged sprocket has a raised rim on one or both sides to help retain the chain laterally — useful on applications with vibration or where the chain may wander. This listing is for flat-hub sprockets.
