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When a worn or mismatched sprocket causes chain skip, premature wear, or unexpected downtime, finding an exact-fit replacement becomes urgent. Whether you're a machine builder, maintenance technician, or hands-on maker, these roller chain sprockets are engineered to drop into standard drive systems without custom machining — saving you time and keeping your equipment running.
These flat chain sprockets are available in three ISO roller chain series — 06B (3/8" pitch), 08B (1/2" pitch), and 10A (5/8" pitch) — with tooth counts ranging from 30T to 45T. Each sprocket features a pilot bore design, machined from carbon steel with a natural or lightly finished surface. Outer diameters vary by series and tooth count, typically ranging from approximately 60 mm (2.36") up to 230 mm (9.06") across the full selection.
Typical use cases include conveyor drive replacement sprockets for light industrial lines, go-kart and mini-bike rear sprocket upgrades requiring ISO 06B or 08B chain compatibility, and agricultural or garden machinery chain drive rebuilds where a 10A pilot bore sprocket for roller chain is needed as a direct swap.
Available in 06B, 08B, and 10A — covering the most common metric roller chain pitches for industrial and recreational drive systems.
Choose from 30T to 45T to dial in your exact gear ratio. More tooth options mean finer speed and torque tuning for your application.
Supplied with a pilot bore for easy machining to your required shaft diameter. Suitable for custom keyway and set-screw configurations.
Machined from carbon steel for solid load-bearing capacity and wear resistance across typical chain drive duty cycles.
Flat (simplex) sprocket body keeps weight low and fits standard single-strand roller chain without spacers or adapters.
Order 1, 2, or 3 pieces per transaction — ideal for stocking spares or outfitting multiple drive stations in one purchase.
| Chain Series | 06B, 08B, 10A (ISO standard) |
|---|---|
| Chain Pitch | 06B: 3/8" (9.525 mm) | 08B: 1/2" (12.7 mm) | 10A: 5/8" (15.875 mm) |
| Tooth Count | 30T, 31T, 32T, 33T, 34T, 35T, 36T, 37T, 38T, 39T, 40T, 41T, 42T, 45T |
| Bore Type | Pilot bore (finish bore to suit) |
| Material | Carbon steel |
| Sprocket Type | Flat / Simplex (single-strand) |
| Outer Diameter | See variant options |
| Hub Diameter | See variant options |
| Hub Length | See variant options |
| Pilot Bore Diameter | See variant options |
| Surface Finish | Natural / lightly oiled |
| Available Quantities | 1 Pcs, 2 Pcs, 3 Pcs |
Match the sprocket series to your existing chain. Measure the chain pitch: 06B uses 3/8" (9.525 mm) pitch, 08B uses 1/2" (12.7 mm) pitch, and 10A uses 5/8" (15.875 mm) pitch. If you're unsure, check the chain manufacturer's markings stamped on the side plates.
Tooth count determines your drive ratio. A larger driven sprocket (more teeth) reduces output speed and increases torque; a smaller one does the opposite. Match the tooth count to your existing sprocket or calculate the ratio you need based on your motor RPM and desired output speed.
A pilot bore sprocket is supplied with a small-diameter starter bore. You or a machinist bore it out to your exact shaft diameter and add a keyway or set-screw hole as needed. This makes pilot bore sprockets highly versatile — one part fits many shaft sizes.
No. These are simplex (single-strand) flat sprockets designed for single-row roller chain only. For duplex chain applications, you would need a duplex sprocket with the appropriate wider hub and tooth profile.
These carbon steel sprockets are suitable for indoor and sheltered outdoor use with regular lubrication. For harsh outdoor or wet environments, apply a chain lubricant or anti-rust coating after installation. For highly corrosive environments, consider stainless steel alternatives.
Yes, provided you match the chain series (06B, 08B, or 10A), tooth count, and bore the pilot to your shaft size. Always replace the chain at the same time as the sprocket — running a new sprocket on a worn chain accelerates wear on both components.
Order 1 piece for a single replacement. Order 2 or 3 pieces if you're outfitting multiple drive stations, want to keep a spare on hand, or are building a new machine with matched sprocket sets. Multi-pack pricing offers a lower per-unit cost.
