#40 Sprocket 21T 1" Bore Hardened Black Oxide
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- Precision-Machined Bore for Seamless Fit: 21 tooth with 1" bore diameter and 1/4" x 1/8" keyway. Ultra-precise dimensions ensure perfect integration with matching components for smooth power transmission.
- Premium AISI 1045 Steel with Hardened Teeth: High-temperature quenched for exceptional wear resistance and durability in demanding applications.
- ANSI Standard: This 40BS21 sprocket comes with a 1'' precision-machined hole, featuring a keyway and three set screws. Its teeth are hardened to enhance durability. This sprocket fully complies with all ANSI standards.
- Black Oxide Coating for Corrosion Resistance: All-over rust-proof finish extends service life, even in harsh environments.
- Low-Maintenance Versatility: Requires only lubrication for easy upkeep. Ideal for industrial equipment, conveyors, agricultural machinery, and DIY projects.
Estimated shipping
Select a product to estimate shipping.This HJGuamou 21T Roller Chain Sprocket is a robust and reliable component designed for demanding industrial and mechanical applications. Crafted for precision and durability, it’s a solid choice for a variety of power transmission needs.
Key Highlights
- Precise Fit: Features a 1" bore diameter and 1/4" x 1/8" keyway for seamless integration with roller chains.
- High Wear Resistance: Constructed from premium AISI 1045 steel and hardened teeth, providing exceptional durability.
- Corrosion Protection: The black oxide coating offers superior rust resistance, extending the sprocket’s lifespan.
- Low Maintenance: Requires minimal lubrication for straightforward upkeep and reduced downtime.
Useful Facts
- Dimensions: 3.58 x 3.58 x 0.88 inches
- Weight: 6.3 ounces
- Manufacturer: Aoxing Trading Co., Ltd
- Availability: Released August 20, 2025
Good Fit For
- Industrial Equipment
- Conveyors
- Agricultural Machinery
- DIY Mechanical Projects
Product details





| Main Specification | |
|---|---|
| Manufacturer | Aoxing Trading Co., Ltd |
| Brand | HJGuamou |
| Product Dimensions | 3.58 x 3.58 x 0.88 inches |
| Item Weight | 6.3 ounces |
| Others | |
| Date First Available | 2025 or August 20 |
| Product Type | Roller Chain Sprockets |































