Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
When a worn or mismatched sprocket causes chain skip, premature wear, or unexpected downtime, engineers and DIY builders alike need a direct-fit replacement they can count on. These 08B roller chain sprockets are designed for makers, machine builders, and maintenance professionals who demand dimensional accuracy and consistent tooth engagement across every cycle.
Each sprocket in this listing is machined to the ISO 08B standard with a pitch of 12.7mm (1/2"). Available in 41 through 60 tooth counts, the bore and hub dimensions follow standard step-hub geometry. Material is typically carbon steel with a natural or lightly treated finish; exact surface treatment may vary by variant — see variant options for confirmation.
Typical applications include conveyor drive systems requiring precise chain indexing, agricultural and light industrial machinery using #08B roller chain, and custom fabrication projects such as go-kart drivetrains, rotary actuators, and chain-driven automation rigs where tooth count selection directly controls gear ratio and output speed.
| Chain Standard | ISO 08B-1 / DIN 8187 |
|---|---|
| Chain Pitch | 12.7mm (1/2") |
| Tooth Count (T) | 41T, 42T, 43T, 44T, 45T, 46T, 47T, 48T, 49T, 50T, 51T, 52T, 53T, 54T, 55T, 56T, 57T, 58T, 59T, 60T |
| Roller Diameter Compatibility | 8.51mm (0.335") — ISO 08B standard roller |
| Hub Style | Step hub |
| Bore Diameter | See variant options |
| Pitch Circle Diameter (PCD) | See variant options |
| Outside Diameter (OD) | See variant options |
| Hub Length | See variant options |
| Material | Carbon steel |
| Surface Finish | See variant options |
| Packing Quantity | 1 piece per unit |
Tooth count determines your drive ratio. Divide the driven sprocket tooth count by the drive sprocket tooth count to get the reduction ratio. For example, a 20T drive sprocket paired with a 60T driven sprocket gives a 3:1 reduction — the output shaft turns at one-third the input speed with three times the torque. Select your tooth count based on the speed and torque requirements of your specific machine.
These sprockets are designed for ISO 08B-1 roller chain with a 12.7mm (1/2") pitch and an 8.51mm roller diameter. This is the same chain commonly designated as #08B in metric markets. Do not use with ANSI #40 chain — while the pitch is identical at 1/2", the roller diameter differs (7.95mm for ANSI #40 vs. 8.51mm for ISO 08B), which will cause poor engagement and accelerated wear.
These carbon steel sprockets are suitable for light-to-medium industrial duty cycles, including conveyor systems, agricultural equipment, and automated machinery operating within the rated load capacity of 08B-1 chain. For heavy shock-load environments or continuous high-speed operation, verify the working load against the chain manufacturer's rated breaking strength and apply an appropriate service factor.
Carbon steel sprockets are susceptible to surface oxidation when exposed to moisture without protection. For outdoor or washdown environments, apply a chain lubricant or anti-corrosion coating regularly. If your application requires inherent corrosion resistance, consider stainless steel sprockets instead — contact us to confirm availability for your tooth count.
Bore diameter varies by tooth count and is listed in the variant options. If the standard bore does not match your shaft diameter, the step-hub design allows a machinist to bore and key the sprocket to your required shaft size. We recommend confirming the maximum bore diameter for your selected tooth count before ordering if custom machining is planned.
A worn chain will cause accelerated sprocket tooth wear even on a new sprocket. Check chain elongation using a chain wear gauge or by measuring a 12-link span — if elongation exceeds 1.5–2% of nominal length, replace the chain alongside the sprocket. Visible hooked or shark-fin tooth profiles on the sprocket are a clear sign the sprocket should be replaced at the same time as the chain.
Yes. 08B sprockets are widely used in go-kart drivetrains, motorized bicycle builds, rotary actuators, and custom chain-drive fabrication projects. Confirm that your chain is ISO 08B-1 (not ANSI #40 or #41) and that the bore diameter suits your axle or shaft. The 41–60 tooth range gives you significant flexibility in tuning your final drive ratio.
