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When a standard carbon-steel sprocket corrodes, seizes, or contaminates your process, the entire drive train pays the price. Engineers, fabricators, and serious DIY builders who work in wet, washdown, food-adjacent, or outdoor environments need a sprocket that holds its geometry and surface integrity over thousands of operating hours — not one that rusts after the first rain. The 304 SS Roller Chain Drive Sprocket is machined for 3/8" (06B) roller chain and is available in 10T through 30T tooth counts, letting you dial in the exact speed ratio your application demands.
Each sprocket is manufactured from 304 stainless steel, offering a balance of corrosion resistance, machinability, and structural rigidity. The bore is supplied in rough-bore (unfinished) form, ready for custom boring, keyway cutting, or set-screw fitting to your specific shaft diameter. The 06B chain standard specifies a pitch of 9.525 mm (3/8"), with roller diameter typically 6.35 mm (0.250") and inner plate width typically 5.72 mm (0.225"). Sprocket outer diameter scales with tooth count, ranging from approximately 38 mm (1.50") at 10T to approximately 95 mm (3.74") at 30T.
Typical use cases include light-duty conveyor drives for food processing and washdown lines, replacement sprockets for agricultural equipment exposed to moisture, custom-ratio drive systems in robotics and automation builds, and marine or coastal machinery where salt-air corrosion is a constant concern. Search terms like "stainless steel 06B sprocket rough bore," "3/8 pitch roller chain sprocket 304 SS," and "corrosion resistant chain drive sprocket" all lead here.
| Chain Standard | BS/ISO 06B |
|---|---|
| Chain Pitch | 9.525 mm (3/8") |
| Roller Diameter | 6.35 mm (0.250") |
| Inner Plate Width | 5.72 mm (0.225") |
| Tooth Count Options | 10T, 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 21T, 22T, 23T, 24T, 25T, 26T, 27T, 28T, 29T, 30T |
| Approximate OD (10T) | ~38 mm (~1.50") |
| Approximate OD (20T) | ~63 mm (~2.48") |
| Approximate OD (30T) | ~95 mm (~3.74") |
| Bore Type | Rough Bore (unfinished — custom machining required) |
| Material | 304 Stainless Steel |
| Hub Style | See variant options |
| Hub Diameter | See variant options |
| Hub Length | See variant options |
| Weight | See variant options |
| Surface Finish | Natural (uncoated stainless) |
| Strand | Single strand (simplex) |
The tooth count (T) determines your drive ratio. Divide the driver sprocket teeth by the driven sprocket teeth to get the speed ratio. For example, a 10T driver paired with a 20T driven sprocket gives a 2:1 reduction — the output shaft turns at half the input speed with twice the torque. Choose a smaller tooth count on the driver for speed reduction, or a larger tooth count for speed increase. As a general rule, avoid ratios greater than 6:1 on a single-stage chain drive.
The rough bore is supplied undersized and must be machined to your required shaft diameter. The maximum bore diameter you can achieve depends on the hub diameter of the specific tooth-count variant — contact us to confirm the hub dimensions before ordering if you have a large shaft. Standard machining operations (boring, reaming, broaching for keyways, drilling for set screws) are all compatible with 304 stainless steel.
304 stainless steel has a tensile strength of approximately 515 MPa (75 ksi) and a yield strength of approximately 205 MPa (30 ksi). It is well-suited for light-to-medium duty chain drives, conveyor systems, and machinery operating at moderate speeds and loads. For heavy-duty industrial drives with high shock loads or elevated temperatures above 400 °C, consider 316 SS or carbon steel alternatives. If you are unsure whether 304 SS meets your load requirements, share your application details and we can advise.
304 stainless steel provides solid corrosion resistance in freshwater, mild chemical, and intermittent washdown environments. In continuous saltwater immersion or chloride-heavy environments (such as swimming pool areas or coastal marine applications), 316 stainless steel offers superior pitting resistance due to its molybdenum content. For occasional salt-air or spray exposure, 304 SS performs reliably without surface treatment.
This sprocket is machined specifically for BS/ISO 06B chain with a 9.525 mm (3/8") pitch. While ANSI #35 chain also has a 3/8" pitch, the roller diameter and inner plate width differ from the 06B standard, which means tooth geometry and engagement will not match correctly. Do not use this sprocket with ANSI #35 chain — use a dedicated ANSI #35 sprocket for that chain type.
Yes. The 3/8" 06B Chain 1.5 m variant listed on this page is fully compatible with all tooth-count sprocket variants. It provides 1.5 meters of matched 06B roller chain, which is sufficient for many small conveyor, drive, or tensioner builds. If you need a longer chain run, you can order multiple chain lengths and connect them with standard 06B connecting links (sold separately).
Machining 304 stainless steel requires sharp, high-speed steel (HSS) or carbide tooling and adequate cutting fluid to prevent work hardening. A lathe is used for boring to diameter; a broaching press or keyway broach set is needed for keyways. Set-screw holes can be drilled and tapped on a drill press or mill. If you do not have access to machining equipment, most local machine shops can finish a rough bore sprocket quickly and affordably.
