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When a worn or undersized sprocket causes chain skip, premature wear, or misalignment in your drive system, finding an exact-fit replacement shouldn't slow your project down. This simplex sprocket wheel is engineered for makers, machine builders, and mechanical DIYers who need a reliable, dimensionally accurate #40 (08B) sprocket without the lead time of custom fabrication.
Each sprocket is machined from carbon steel with a natural or lightly finished surface, available in tooth counts from 9T to 60T and bore sizes ranging from 10 mm (0.39 in) to 20 mm (0.79 in). The 1/2-inch (12.7 mm) pitch conforms to the ISO 08B-1 / ANSI #40 standard, ensuring dimensional interchangeability across compatible chain and sprocket systems.
Typical applications include conveyor drive systems requiring a #40 chain sprocket replacement, go-kart and mini-bike rear axle sprocket upgrades, and custom automation or robotics builds using standard roller chain drive components. Whether you're sourcing a 9-tooth small drive sprocket or a 60-tooth large driven sprocket, this range covers the full spectrum of single-strand #40 chain drive configurations.
| Chain Standard | ANSI #40 / ISO 08B-1 |
|---|---|
| Chain Type | Single-Strand (Simplex) Roller Chain |
| Pitch | 1/2 inch (12.7 mm) |
| Tooth Count Range | 9T – 60T (see variant options) |
| Bore Size Range | 10 mm – 20 mm (see variant options) |
| Material | Carbon Steel |
| Surface Finish | Natural / Lightly Finished |
| Hub Style | Solid Hub |
| Keyway | See variant options |
| Set Screw | See variant options |
| Outer Diameter | See variant options |
| Hub Diameter | See variant options |
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 9T drive sprocket paired with a 45T driven sprocket gives a 5:1 reduction. Use a smaller tooth count on the motor/engine shaft and a larger count on the output shaft for speed reduction and torque multiplication.
Select the bore size that matches your shaft diameter. Bore sizes in this listing range from 10 mm (for 9T–15T sprockets) up to 20 mm (for 50T–60T sprockets). Measure your shaft with a caliper before ordering. If you need a bore size not listed, the sprocket can typically be bored out by a local machine shop.
Yes. This sprocket is designed to the ANSI #40 / ISO 08B-1 standard with a 1/2-inch (12.7 mm) pitch. It is compatible with any standard single-strand #40 or 08B-1 roller chain from any manufacturer, as long as the chain pitch matches.
The carbon steel construction provides solid performance for moderate-load applications such as go-karts, conveyors, and light machinery. For heavy industrial or high-shock-load applications, consult the chain manufacturer's rated working load for #40 chain and ensure your sprocket tooth count and shaft size are appropriately sized for the torque involved.
Carbon steel sprockets have moderate corrosion resistance. For outdoor or wet environments, we recommend applying a light coat of chain lubricant or anti-rust spray regularly. For highly corrosive environments, consider stainless steel sprockets instead.
The sprocket hub has sufficient material for a local machine shop to add a keyway or set screw hole if not already present. This is a common modification for securing the sprocket to a keyed shaft. Check the hub dimensions for your selected variant before proceeding.
Both designations refer to roller chain with a 1/2-inch (12.7 mm) pitch, but there are minor dimensional differences in roller diameter and inner plate width between the ANSI and ISO standards. This sprocket is designed to the ISO 08B-1 profile, which is the international standard. In most practical DIY and light industrial applications, #40 and 08B-1 chains and sprockets are interchangeable, but verify chain dimensions if mixing brands.
