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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

  • Product 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.

How it compares

Measured against everything we stock in Bearings, Belts & Drive Components, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 66% of the 693 comparable items (median $35.99).

Specifications

Product
Product 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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