Tsubaki 50SDS21 Sprocket 50 Chain 21 Teeth
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.
How it compares
Measured against everything we stock in Bearings, Belts & Drive Components, at today’s prices. Recalculated every night.
- Price $55.99
- Pricier than about 65% of the 693 comparable items (median $35.99).
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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