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Black oxide steel sprocket 25 teeth 80 chain 8.52 in outside diameter 7.979 in pitch diameter 1.175 in hub projection 1045 grade

Tsubaki

Tsubaki 80B25 Sprocket 80 Chain 25 Teeth Collectible

SKU CH-9R4E-0WCZ5

Steel sprocket for 80 chain with 25 teeth, 1045 grade, 8.52 in outside diameter, 7.979 in pitch diameter, 1.175 in hub projection, plain bore with keyway

  • TypeBearings, V-belts & Power Transmission Equipment
  • ColorTransparent
  • Precision-machined 1045 steel withstands heavy loads
  • 25-tooth profile matches #80 chain pitch exactly
  • 52 in outside diameter fits existing drive layout
  • Black oxide finish resists corrosion in harsh environments
  • Plain 1 in bore with keyway allows direct shaft mounting

Industrial sprocket for chain drives

The Tsubaki 80B25 is a steel sprocket with 25 teeth cut for 80 chain pitch and a 1 inch plain bore. It is made from 1045 grade steel with a black oxide finish and a hub on one side. The part suits maintenance teams and OEM builders who need a direct replacement for worn drive components.

Fits single-strand 80 chain systems

This sprocket matches equipment designed for single-pitch 80 roller chain with a 1 inch shaft. Buyers who need a different bore size, a double-strand hub, or a finished bore with a keyway already cut should look elsewhere. The plain bore requires machining before installation.

Includes set screws and keyway

The hub projection measures 1.175 inches and the hub diameter is 4 1/4 inches, providing a secure mounting surface. A keyway 1/4 inch wide and 1/8 inch deep is machined into the bore, and set screws are supplied. These features let mechanics lock the sprocket to the shaft without extra hardware.

Highlights

  • Precision-machined 1045 steel withstands heavy loads
  • 25-tooth profile matches #80 chain pitch exactly
  • 52 in outside diameter fits existing drive layout
  • Black oxide finish resists corrosion in harsh environments
  • Plain 1 in bore with keyway allows direct shaft mounting

Specifications

BrandTSUBAKI
TypeBearings, V-belts & Power Transmission Equipment
ColorTransparent

Questions about this item

What chain size and tooth count does the Tsubaki 80B25 sprocket require for proper engagement?

The sprocket is cut for 80 chain with 25 teeth, so it will only mesh correctly with a matching 80-pitch roller chain.

Will the 1-inch plain bore and 1/4-inch keyway fit the existing shaft on my current drive line?

The bore is a plain 1-inch diameter with a 1/4-inch wide by 1/8-inch deep keyway, plus included set screws for locking onto a compatible shaft.

How can I confirm the sprocket is seated and running true after installation?

Measure the outside diameter at 8.52 inches and pitch diameter at 7.979 inches, then verify smooth rotation with no lateral wobble on the 4 1/4-inch hub.

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