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When a worn or mismatched sprocket is causing chain skip, premature wear, or unexpected downtime on your conveyor, drive shaft, or power-transmission build, you need a drop-in replacement that holds tolerance under load. This 08B double-strand sprocket is engineered for makers, machine builders, and maintenance professionals who demand dimensional accuracy and consistent engagement across every tooth.
Each sprocket is machined from 45# medium-carbon steel and features a center burr hole for shaft mounting. The 08B pitch (12.7 mm / 0.500 in) matches standard duplex roller chain. Tooth counts range from 11T to 30T, with outer diameters scaling accordingly from approximately 46 mm (1.81 in) at 11T to approximately 122 mm (4.80 in) at 30T. Hub and bore dimensions vary by tooth count — see variant options for exact figures.
Typical applications include industrial conveyor drives requiring 08B duplex chain sprockets, DIY gearbox and reduction drive builds using double-strand roller chain, and agricultural or light-industrial machinery replacement sprocket sourcing where standard 08B pitch components are specified.
Machined to 12.7 mm (0.500 in) pitch to engage standard 08B double-strand roller chain without shimming or modification.
Manufactured from 45# steel for a balance of machinability, surface hardness, and tensile strength suited to moderate-to-heavy drive loads.
Eighteen tooth-count variants let you dial in your exact gear ratio — from compact 11T driver sprockets to larger 30T driven sprockets — without custom fabrication.
Each sprocket includes a machined center bore (burr hole) ready for direct shaft insertion or further boring to your required shaft diameter.
Tooth flanks are cut to ISO/DIN 08B profile standards, ensuring smooth chain seating, even load distribution, and reduced chain elongation over time.
The duplex sprocket body accommodates two parallel chain strands simultaneously, doubling load capacity compared to a single-strand 08B sprocket of the same tooth count.
| Chain Standard | 08B Duplex (Double-Strand) |
|---|---|
| Chain Pitch | 12.7 mm (0.500 in) |
| Strand Count | 2 (Double / Duplex) |
| Tooth Count Range | 11T – 30T (18 variants) |
| Material | 45# Medium-Carbon Steel |
| Mounting Style | Center Burr Hole |
| Bore Diameter | See variant options |
| Outer Diameter | See variant options |
| Hub Diameter | See variant options |
| Hub Length | See variant options |
| Surface Finish | Natural / Machined |
| Applicable Standard | ISO/DIN 08B |
Your drive ratio determines the tooth count pairing. Divide the driven sprocket teeth by the driver sprocket teeth to get the reduction ratio. For example, a 30T driven sprocket paired with a 15T driver gives a 2:1 reduction. Select the tooth count that achieves your target output speed or torque, then confirm the resulting pitch-circle diameter fits within your frame clearance.
This sprocket is designed exclusively for 08B duplex (double-strand) roller chain with a 12.7 mm (1/2 in) pitch. It will not correctly engage 08A (ANSI #40) single-strand chain or any other pitch. Always verify the chain pitch marking before ordering.
Each sprocket ships with a machined center burr hole. The as-supplied bore diameter varies by tooth count — please refer to the variant detail page or contact us to confirm the exact bore for your selected tooth count. The bore can typically be enlarged by a machinist to match your shaft diameter.
45# medium-carbon steel offers a tensile strength of approximately 600–800 MPa in the normalized condition, making it well-suited for moderate-to-heavy conveyor, reduction drive, and light-industrial power-transmission applications. For high-shock or very high-speed applications, consider whether a heat-treated or alloy-steel sprocket would better suit your load profile.
45# steel is not inherently corrosion-resistant. For outdoor, washdown, or humid environments, apply a chain lubricant or anti-rust coating after installation, or consider a stainless-steel sprocket alternative. Regular lubrication of both the chain and sprocket teeth is recommended to extend service life in all environments.
No. This is a double-strand (duplex) sprocket with two sets of tooth tracks. Using it with a single-strand chain will result in misalignment and accelerated wear. If you need a single-strand 08B sprocket, please browse our 08B simplex sprocket listings.
Measure your shaft diameter with a caliper, then compare it to the as-supplied bore diameter for your chosen tooth count (contact us to confirm). If the bore is smaller than your shaft, a local machine shop can bore it out. If the bore is already larger than your shaft, a keyway and set-screw arrangement or a taper-lock bushing adapter may be required.
