Transmissions
Chain Sprockets
Bored & Keyed Sprockets
1/2inch Pitch Bored & Keyed Sprockets
Quick Code: BB-701018
08B1 21T Sprocket Comes With 32mm Bore & Keyway with 2 Grubscrews (4SR21 32BK&2GS)
The 08B1 21T Sprocket with 32mm Bore & Keyway is a precision-engineered power transmission component designed for applications requiring higher tooth counts with medium to large shaft compatibility. This bored and keyed sprocket features a 21-tooth design with a 1/2 inch pitch, making it an ideal choice for systems requiring increased speed ratios and smooth power delivery in industrial chain drive configurations.
Key Features:
- 21 Teeth: Higher tooth count optimized for increased speed delivery while maintaining consistent torque transmission
- 32mm Pre-Machined Bore: Ready-to-install bore eliminates additional machining requirements and accommodates medium to large diameter shafts
- Integral Keyway: Ensures positive drive engagement and prevents shaft slippage during operation
- Dual Grubscrews: Provides secure and reliable shaft mounting with redundant fastening for enhanced security
- 1/2 Inch (08B1) Pitch: Compatible with standard 1/2 inch pitch roller chains
- Precision-engineered for consistent, reliable performance
Ideal Applications:
This sprocket is well-suited for use in:
- High-speed conveyor systems and material handling equipment
- Packaging machinery requiring increased speed ratios
- Agricultural equipment and farm machinery with larger shaft requirements
- Industrial power transmission systems requiring balanced performance
- Heavy-duty drive systems with medium to large bore diameter shafts
- Equipment requiring efficient power transfer with compact design
Reference: 4SR21 32BK&2GS SPKT
As part of our extensive range of over 165 bored and keyed sprockets, this component delivers the precision and reliability needed for demanding industrial applications. Whether you need a replacement sprocket for existing equipment or are designing a new chain drive system, our technical team is available to assist with application-specific recommendations and specification selection.

