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Black oxide steel sprocket, 20 teeth, 5/8 inch plain bore with keyway

Tsubaki

Tsubaki 40B20 Sprocket 40 Chain 5/8 Bore 20 Teeth

SKU CH-YRRQ-P3032

Steel sprocket for 40 chain with 20 teeth, 5/8 in plain bore, 3.46 in outside diameter and keyway included

  • TypeSprockets
  • Precision fit with 5/8 in plain bore and 20 teeth
  • Durable 1045 steel construction with black oxide finish
  • Reliable power transfer for 40 chain single-strand drives
  • Secure mounting via included set screws and keyway
  • Compact hub design measuring 2 5/8 in diameter

Tsubaki 40B20 Sprocket for 40 Chain

This steel sprocket has 20 teeth and a plain 5/8 inch bore with a 3/16 inch keyway and set screws included. It suits single-strand 1/2 inch pitch chain drives in industrial machinery and automotive power transmission systems. The 1045 grade steel construction with black oxide finish resists wear in continuous operation. Buyers who need a different tooth count or a taper-lock bore should look elsewhere.

Sustained load behaviour

The 1045 steel material handles steady torque loads while the black oxide finish reduces surface friction during extended running. A 3.196 inch pitch diameter and 3.46 inch outside diameter maintain consistent chain engagement over long shifts. The 0.716 inch hub projection and 2 5/8 inch hub diameter distribute force across the shaft connection. High-speed or shock-load applications requiring hardened teeth are not a match for this standard sprocket.

Installation and common issues

The plain bore with 3/32 inch keyway depth and included set screws allows direct shaft mounting without additional bushings. One-sided hub design simplifies alignment on the drive shaft. Verify that the 1 inch length through bore matches your shaft spacing before ordering. Misaligned keyways or undersized shaft diameters are the typical causes of premature wear or loosening during operation.

Highlights

  • Precision fit with 5/8 in plain bore and 20 teeth
  • Durable 1045 steel construction with black oxide finish
  • Reliable power transfer for 40 chain single-strand drives
  • Secure mounting via included set screws and keyway
  • Compact hub design measuring 2 5/8 in diameter

Specifications

TypeSprockets

Questions about this item

How much heat does the steel 1045 sprocket generate when running continuously?

The carbon-steel 1045 body dissipates heat through its 3.46 in outside diameter and 1 in length through bore, so temperature rise depends on chain speed and load rather than the sprocket itself.

Which shaft size and keyway does the 5/8 in plain bore with 3/16 in keyway width require?

It fits a 5/8 in diameter shaft and accepts a standard 3/16 in wide by 3/32 in deep keyway; the included set screws lock it in place.

Will this 20-tooth, 40-chain sprocket mesh with an older 40-chain that has worn pitch?

The 3.196 in pitch diameter matches standard 40-chain 1/2 in pitch, so it engages correctly as long as the old chain remains within ANSI wear limits.

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