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Steel sprocket with black oxide finish, 9 teeth, plain bore, single hub

Tsubaki

Tsubaki 40B9 Sprocket Plain 40 Chain 1/2 Bore 9 Teeth

SKU CH-P0RN-SVADQ

Transmits rotary motion on #40 roller chain using a 9-tooth steel sprocket with a 1/2 in plain bore and keyway

  • TypeSprockets
  • Hardened 1045 steel resists wear
  • 9-tooth design meshes with 40 chain
  • 1/2 in plain bore fits standard shafts
  • Black oxide finish protects against corrosion
  • Includes set screws and keyway for secure mounting

40-Chain Steel Sprocket

The Tsubaki 40B9 is a plain-bore sprocket machined from 1045 steel with a black-oxide finish. It carries nine teeth on a 1.462 in pitch diameter and 1.67 in outside diameter. The hub measures 1 1/16 in diameter with a .591 in projection and 7/8 in length through bore. Set screws and a 1/8 in keyway are included for shaft locking.

Verify shaft and chain compatibility

Confirm your shaft diameter is exactly 1/2 in and does not exceed the 9/16 in maximum bore. The sprocket is cut for single-strand 40 chain with 1/2 in pitch only. Ensure the hub projection and length through bore clear adjacent components in your drive layout.

Set screws and keyway simplify installation

Supplied set screws engage the keyway to prevent rotation on the shaft without additional machining. The black-oxide coating provides baseline corrosion resistance during storage and initial operation. No lubricant or tensioning hardware is bundled with the sprocket.

Highlights

  • Hardened 1045 steel resists wear
  • 9-tooth design meshes with 40 chain
  • 1/2 in plain bore fits standard shafts
  • Black oxide finish protects against corrosion
  • Includes set screws and keyway for secure mounting

Specifications

TypeSprockets

Questions about this item

Does the Tsubaki 40B9 sprocket arrive with set screws and a keyway, or must I supply them separately?

The sprocket ships with set screws included and features a 1/8 in wide by 1/16 in deep keyway machined into the 1/2 in plain bore.

Should I select the 40 chain size with 9 teeth or a different tooth count for my drive ratio?

Choose the 9-tooth version when your design requires a 1.462 in pitch diameter and 1.67 in outside diameter on a size-40 chain.

What does the 1.462 in pitch diameter mean once the sprocket is mounted on the shaft?

It defines the effective radius where the chain engages, fixing the speed ratio and centre distance for every revolution of the 1045 steel hub.

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