Tsubaki
Tsubaki 80B21 sprocket plain 80 chain 1 in bore 21 teeth
Plain-bore steel sprocket for single-strand 80 chain, 21 teeth, 1045 grade, 6.71 in pitch diameter, 7.24 in outside diameter, 1.175 in hub projection, includes set screws and 1/4 in keyway
- 21 teeth match #80 chain for precise drive engagement
- 1 in plain bore with 1/4 in keyway fits standard shafts
- 1045 steel construction resists wear under heavy loads
- 71 in pitch diameter maintains correct speed ratio
- Black oxide finish protects against corrosion in harsh environments
Tsubaki 80B21 Sprocket for 80 Chain
This 21-tooth steel sprocket is designed for single-strand 80 chain drives with a 1-inch pitch. The plain bore measures 1 inch and includes a keyway plus set screws for secure shaft attachment. It suits maintenance teams and OEM builders replacing worn sprockets on conveyors, agricultural equipment or industrial machinery.
Pitch Diameter 6.71 Inches Limits Chain Wrap
The 6.71-inch pitch diameter fixes the geometric ratio and minimum centre distance for 80 chain. Chain wrap on this sprocket cannot exceed the engagement angle dictated by that diameter, so layouts requiring tighter angles need a different tooth count. The 7.24-inch outside diameter sets the clearance envelope around the hub.
Plain Bore Installation Requires Keyway Machining
The 1-inch plain bore ships ready for a 1/4-inch wide by 1/8-inch deep keyway cut to match the shaft. Hub projection of 1.175 inches and length through bore of 1 7/8 inches determine how far the sprocket sits on the shaft. Misaligned keyways or undersized set-screw tightening are the common causes of premature wear.
Highlights
- 21 teeth match #80 chain for precise drive engagement
- 1 in plain bore with 1/4 in keyway fits standard shafts
- 1045 steel construction resists wear under heavy loads
- 71 in pitch diameter maintains correct speed ratio
- Black oxide finish protects against corrosion in harsh environments
Specifications
No published specifications for this item yet.
Questions about this item
Should I pick the 21-tooth version or a different tooth count for my 80 chain?
The 21-tooth sprocket gives a 6.71 in pitch diameter and 7.24 in outside diameter; choose a different tooth count only if you need a different speed ratio or centre distance.
What does the 6.71 in pitch diameter mean once the sprocket is mounted on the shaft?
It sets the effective radius where the 80 chain engages, so chain speed equals shaft rpm times 6.71 in divided by 2.
The bore is listed as plain 1 in with a 1/4 in keyway — what does that cap in practice?
The plain bore accepts a 1 in shaft and the 1/4 in wide by 1/8 in deep keyway transmits torque; maximum bore capacity is 2 3/4 in if re-machining is done.
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