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When your drivetrain demands an exact bore diameter that off-the-shelf sprockets can't deliver, a pilot bore design gives engineers, fabricators, and serious DIYers the freedom to machine the bore to their own shaft specification. These 06B-1 simplex roller chain sprockets are built for single-strand 06B chain (3/8" / 9.525 mm pitch) and arrive with a small pilot bore ready for finish boring, reaming, or keyway cutting on your lathe or mill.
Each sprocket is machined from carbon steel with a natural or lightly oiled finish to resist surface oxidation during storage. The tooth profile conforms to ISO 606 / BS 228 standards for 06B-1 simplex chain. Pilot bore diameter is typically 10–16 mm depending on tooth count and hub size; finished bore capacity varies by size — refer to variant specifications or contact us to confirm maximum bore for your selected tooth count. Available in 9 through 40 teeth to cover a wide range of speed-ratio requirements.
Typical applications include light conveyor drives requiring a custom shaft interface, small agricultural equipment gearbox outputs, go-kart and mini-bike secondary drive systems, and compact automation machinery where a 3/8" pitch simplex chain sprocket with a bored-to-size hub is the most practical solution.
Arrives with a small pilot bore so you can finish-bore, ream, or cut a keyway to your exact shaft diameter — eliminating the guesswork of fixed-bore sizing.
Tooth geometry is machined to the international standard for 06B-1 simplex chain, ensuring smooth engagement, reduced noise, and consistent chain life across the full 9–40T range.
Solid carbon steel body provides the rigidity and wear resistance needed for continuous-duty chain drive applications in industrial, agricultural, and hobbyist machinery.
32 tooth-count options in a single product listing let you dial in your drive ratio without sourcing from multiple suppliers — from compact 9-tooth driver sprockets to large 40-tooth driven sprockets.
Available in 1, 3, or 5-piece packs so you can stock spares for maintenance schedules or build multiple identical drive assemblies at a lower per-unit cost.
The hub length and wall thickness are sufficient for standard keyway milling or set-screw retention after finish boring — confirm hub dimensions for your specific tooth count before machining.
| Chain Standard | ISO 606 / BS 228 |
|---|---|
| Chain Type | 06B-1 Simplex Roller Chain |
| Chain Pitch | 3/8" (9.525 mm) |
| Tooth Count Range | 9T – 40T (select variant) |
| Bore Type | Pilot bore (finish bore to suit) |
| Pilot Bore Diameter | See variant options |
| Maximum Finished Bore | See variant options |
| Hub Style | Extended hub, suitable for keyway or set screw |
| Material | Carbon steel |
| Surface Finish | Natural / lightly oiled |
| Strand | Simplex (single strand) |
| Weight | See variant options |
This sprocket is designed exclusively for ISO 606 / BS 228 06B-1 simplex roller chain with a pitch of 3/8" (9.525 mm). It is a single-strand sprocket and is not rated for duplex (06B-2) or triplex (06B-3) chain. Always verify your chain's pitch and strand count before ordering.
A pilot bore sprocket ships with a small-diameter starter bore — typically 10–16 mm depending on tooth count — that is concentric with the pitch circle. You then machine (bore, ream, or broach) the hole to your exact shaft diameter on a lathe or mill. This allows a precise interference or clearance fit and lets you add a keyway or set-screw flat as needed.
Divide the driven sprocket tooth count by the driver sprocket tooth count to get your speed reduction ratio. For example, a 9T driver paired with a 27T driven sprocket gives a 3:1 reduction. As a general rule, use the smallest driver tooth count that keeps chain speed below your system's rated limit, and avoid ratios greater than 6:1 on a single-stage drive.
Carbon steel 06B sprockets are suitable for the load ratings specified by the ISO 606 standard for 06B-1 chain. Exact tensile and fatigue limits depend on the specific steel grade used. For high-shock or high-cycle applications, confirm the material grade with us before ordering. For most light industrial, agricultural, and hobbyist drives operating within the chain's rated working load, carbon steel is the standard and appropriate choice.
Carbon steel will oxidize if left unprotected in humid or wet environments. The sprocket ships with a light oil coating for short-term storage protection. For outdoor or wash-down applications, apply a chain lubricant or anti-corrosion coating after installation. For environments requiring inherent corrosion resistance, consider stainless steel alternatives.
No. Although ANSI 35 chain also has a 3/8" pitch, its roller diameter and inner link width differ from ISO 06B-1. Using mismatched chain and sprocket standards causes accelerated wear and potential disengagement. Always match the chain standard (ISO/BS 06B or ANSI 35) to the sprocket standard.
All three options are the same sprocket — the quantity simply changes how many pieces you receive per order. The 3-piece and 5-piece packs are priced at a lower per-unit cost than buying individually, making them ideal for stocking spares or building multiple identical drive assemblies.
