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Black oxide steel sprocket with 21 teeth and hub on one side

Tsubaki

Tsubaki 50SDS21 Sprocket 50 Chain 21 Teeth

SKU CH-FYZJ-K41JE

A 21-tooth, No. 50 chain sprocket made from 1045 carbon steel with black-oxide finish for corrosion resistance

  • Precision-machined 1045 carbon steel for reliable power transmission
  • 21-tooth design matches #50 chain pitch for smooth engagement
  • Black oxide finish resists corrosion in demanding environments
  • Quick-detachable SDS bushing mount simplifies installation and removal
  • 52 in outside diameter fits compact drive assemblies

Chain-Size 50 Sprocket

The Tsubaki 50SDS21 is a single-strand sprocket cut for 5/8 inch pitch roller chain. It carries 21 teeth and is machined from 1045 carbon steel with a black oxide finish. The hub is bored for an SDS quick-detachable bushing, allowing rapid mounting on shafts between 1/2 inch and 2 inch diameter. Corrosion-resistant surfaces suit industrial drive lines.

Upgrade From Welded or Fixed-Bore Hubs

Swapping a welded or set-screw hub for this QD design cuts change-over time when ratios shift or shafts wear. The jump pays off on lines that see frequent ratio changes or where shaft damage makes re-boring impractical. Fixed-bore sprockets remain simpler for permanent, single-ratio installations.

QD Bushing Limits

The SDS bushing caps usable shaft diameter at 2 inches, so drives needing larger journals cannot use this sprocket. Single-strand 50 chain caps the torque the assembly can transmit regardless of sprocket strength. Hub projection of .407 inch and 3/4 inch length through bore set the axial space the mounting consumes.

Highlights

  • Precision-machined 1045 carbon steel for reliable power transmission
  • 21-tooth design matches #50 chain pitch for smooth engagement
  • Black oxide finish resists corrosion in demanding environments
  • Quick-detachable SDS bushing mount simplifies installation and removal
  • 52 in outside diameter fits compact drive assemblies

Specifications

No published specifications for this item yet.

Questions about this item

What bushing size and type does the 50SDS21 sprocket require?

It is made for an SDS quick-detachable bushing, which locks the sprocket onto the shaft without a keyway.

Which step is most often missed when fitting the SDS bushing onto the shaft?

The set-screws must be torqued evenly in a star pattern; tightening one side first can cock the bushing and cause run-out.

How can I tell when the 1045 carbon-steel teeth on this 21-tooth sprocket need replacement?

Replace it when the tooth profile shows visible hooking or the chain rollers no longer seat cleanly in the 5/8 in pitch gaps.

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