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Black oxide steel sprocket, 11 teeth, 1/2 inch bore, 2 inch outside diameter

Tsubaki

Tsubaki 40B11 Sprocket 40 Chain 1/2 Bore 11 Teeth collectible

SKU CH-EBAA-S9JSY

Steel 40-chain sprocket with 11 teeth, 1/2 in bore, keyway and set screws included

  • TypeBearings, V-belts & Power Transmission Equipment
  • ColorTransparent
  • Precision-machined 11-tooth profile ensures accurate chain engagement
  • Grade 1045 steel construction delivers high strength and wear resistance
  • Black oxide finish protects against corrosion in harsh environments
  • 1/2 inch plain bore with keyway allows direct shaft mounting
  • Compact 2 inch outside diameter fits tight machine spaces

Tsubaki 40B11 Sprocket 40 Chain 1/2 Bore 11 Teeth

This new Tsubaki sprocket is a steel power-transmission component finished in black oxide with a transparent appearance. It features a plain 1/2 inch bore, 11 teeth, and a 2 inch outside diameter for single-strand 40 chain. The hub projects .591 inch with a 1 7/16 inch diameter and includes set screws plus a keyway. It is sold as a collectible item for enthusiasts of industrial hardware.

Replaces Worn 40 Chain Sprockets With 11 Tooth Count

This unit serves as a direct replacement for a damaged or worn sprocket matching the same 40 chain pitch, 1/2 inch bore, and 11 tooth specification. The jump is worth it when the existing component shows tooth hooking, excessive wear, or keyway damage that affects timing. Material grade 1045 steel provides standard durability for the intended load range. Collectors seeking a pristine, unused example of this specific configuration will also find the condition suitable.

Limited To Single-Strand 40 Chain

The sprocket is constrained to single-pitch 40 chain with a 1/2 inch pitch diameter of 1.775 inches. Its plain bore requires a matching shaft and set-screw retention; it does not accommodate a taper-lock bushing or splined connection. The fixed 11 tooth count and 7/8 inch maximum bore diameter limit ratio and shaft-size flexibility. Buyers needing a different tooth count, multi-strand capacity, or a bushed hub type cannot use this component.

Highlights

  • Precision-machined 11-tooth profile ensures accurate chain engagement
  • Grade 1045 steel construction delivers high strength and wear resistance
  • Black oxide finish protects against corrosion in harsh environments
  • 1/2 inch plain bore with keyway allows direct shaft mounting
  • Compact 2 inch outside diameter fits tight machine spaces

Specifications

BrandTSUBAKI
TypeBearings, V-belts & Power Transmission Equipment
ColorTransparent

Questions about this item

What shaft diameter does the 1/2 in bore of this 40B11 sprocket fit?

The plain bore is 1/2 in diameter and can be re-bored up to a maximum of 7/8 in to match your shaft.

How do you secure the sprocket on the shaft using the included set screws and 1/8 in keyway?

Align the 1/8 in wide by 1/16 in deep keyway with the shaft key, slide the sprocket on, then tighten both set screws against the key and shaft flat.

When should the sprocket be replaced based on wear of the 11 teeth and 1.775 in pitch diameter?

Replace it when the 11 teeth show hooked profiles or the chain elongates past 1.5 % of the 1.775 in pitch diameter.

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