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When your conveyor stalls, your go-kart skips a beat, or your DIY automation project demands reliable power transfer, the weak link is almost always a mismatched or worn drivetrain. Makers, hobbyists, and light-industrial builders who need a complete 05B chain drive solution — sprocket, chain, and connecting hardware — in one place will find everything here.
This listing covers the full 05B drivetrain family: machined sprockets from 10 to 50 teeth, roller chain sold by the half-meter or meter, full-link connecting buckles (sold in pairs), and half-link offset buckles — all built to the 05B standard with an 8mm pitch (approximately 0.315 in). Sprocket bore and hub dimensions vary by tooth count; see variant options for exact specifications.
Typical applications include small conveyor belt drives for workshop automation, go-kart and mini-bike chain drive replacement, 3D-printer or CNC axis drive systems requiring 05B roller chain, and light agricultural or garden-equipment power transmission upgrades.
| Chain Standard | 05B (ISO/BS) |
|---|---|
| Pitch | 8 mm (0.315 in) |
| Available Tooth Counts | 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 35, 36, 40, 45, 50 |
| Sprocket Bore Diameter | See variant options |
| Sprocket Hub Style | See variant options |
| Sprocket Material | Carbon steel (surface treated) |
| Chain Type | 05B single-strand roller chain |
| Chain Inner Width | Typically 3.0 mm (0.118 in) |
| Chain Roller Diameter | Typically 5.0 mm (0.197 in) |
| Chain Available Lengths | 0.5 m / 1 m / 1.5 m |
| Connecting Link Types | Full Link Buckle (2 pcs), Half Link Buckle |
| Finish | Anti-oxidation surface treatment |
Your gear ratio is determined by dividing the driven sprocket tooth count by the drive sprocket tooth count. For example, a 10-tooth drive sprocket paired with a 30-tooth driven sprocket gives a 3:1 reduction — tripling torque while reducing speed to one-third. Use a higher tooth count on the driven side for more torque, or a lower count for higher speed. If you are replacing an existing sprocket, match the tooth count exactly to maintain your original ratio.
These sprockets conform to the standard 05B pitch (8mm), so they are mechanically compatible with any ISO/BS 05B single-strand roller chain from any manufacturer. The chain sold in this listing is also 05B standard, making it a convenient matched set, but you are not required to use it together.
Bore diameter varies by tooth count — smaller sprockets typically have a smaller bore, and larger sprockets accommodate larger shafts. Please check the variant detail page or contact us to confirm the bore size for your specific tooth count before ordering. If you need a custom bore, a machinist can typically enlarge a standard bore with a lathe.
The 05B chain is rated for light-to-medium duty applications. Typical minimum breaking load for 05B chain is approximately 4.4 kN (990 lbf), though working load should be kept well below this figure — generally 1/6 to 1/8 of the breaking load — to account for dynamic shock loads and fatigue. This makes it well-suited for go-karts, small conveyors, garden equipment, and DIY automation, but not for heavy industrial drives requiring ANSI 40 or larger chain.
The Full Link Buckle (sold as 2 pcs) is a standard connecting link used to join two ends of chain at a full-pitch interval — ideal when your required chain length is an even number of pitches. The Half Link Buckle (offset link) adds half a pitch, allowing you to fine-tune chain length when an even number of links would leave the chain too long or too short. Use the half link only when necessary, as it is slightly weaker than a full inner link.
Yes. All roller chains require periodic lubrication to minimize wear between the pin, bushing, and roller. For light-duty or intermittent use, apply a light machine oil or chain lubricant every 20–50 hours of operation, or whenever the chain appears dry or begins to make noise. For continuous or outdoor use, lubricate more frequently and consider a chain cover to keep out debris.
Yes — each component is sold separately. Select 05B-Sprocket and your desired tooth count to order a sprocket only. Select 05B-Roller Chain and your preferred length (0.5 m, 1 m, or 1.5 m) to order chain only. Connecting buckles are also available individually. Mix and match to suit your exact project needs.
