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Small black-oxide steel sprocket with nine teeth, quarter-inch plain bore, single hub side, set screws included

Tsubaki

Tsubaki 25B9 sprocket 25 chain 1/4 bore 9 teeth

SKU CH-9G22-SX0T0

Steel sprocket for 25 chain with 9 teeth, 1/4 in bore, black oxide finish and set screws included

  • TypeSprockets
  • Fits 25 chain with 9 teeth for precise drive engagement
  • 1/4 in bore diameter matches standard shaft sizes
  • 1045 steel construction resists wear under load
  • Black oxide finish provides corrosion resistance
  • Includes set screws and keyway for secure mounting

Sprocket 25B9 – 9-tooth 1/4 in. bore

This Tsubaki 25B9 sprocket fits 25 chain pitch and has a plain 1/4-inch bore with a keyway and set screws. The steel body uses 1045 grade material with a black-oxide finish for corrosion resistance. Hub diameter is 7/16 inch and projection is 0.39 inch. It is a single-strand, single-pitch sprocket ready for direct mounting.

Suits drives needing a compact 9-tooth 25-chain

Builders who need more teeth for a larger pitch diameter should choose a different sprocket. Machines that require a finished bore with a keyway already cut to a specific size cannot use this plain-bore version. Applications demanding stainless steel or a different hub style will need another part.

9 teeth on 25 chain pitch

The nine-tooth count fixes the pitch diameter at 0.731 inch and the outside diameter at 0.837 inch. This tooth count is the primary factor that determines speed ratio and chain engagement for the drive.

Highlights

  • Fits 25 chain with 9 teeth for precise drive engagement
  • 1/4 in bore diameter matches standard shaft sizes
  • 1045 steel construction resists wear under load
  • Black oxide finish provides corrosion resistance
  • Includes set screws and keyway for secure mounting

Specifications

TypeSprockets

Questions about this item

What chain pitch and bore size must my existing shaft and chain match for this 25B9 sprocket to fit?

The sprocket is made for 1/4 inch pitch chain (chain number 25) and a 1/4 inch plain bore with a keyway, so your shaft must be 1/4 inch diameter and your chain must be 1/4 inch pitch.

Will this 9-tooth steel sprocket with 0.837 in outside diameter mesh correctly with a worn #25 chain I plan to keep?

A 9-tooth sprocket engages more aggressively; if the old #25 chain has stretched beyond 1/4 inch pitch it will skip or accelerate wear on the 1045 steel teeth.

How can I confirm the sprocket is seated and aligned after I tighten the included set screws on the 7/16 in hub?

Rotate the shaft by hand — the chain should run smoothly on the 0.731 in pitch diameter with no tight spots, and the 0.39 in hub projection should sit flush against the mounting surface.

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