PTI 28B-21A metric sprocket, 1-3/4 in. pitch (28B chain), 21 teeth, single strand, Type A plate (plain bore) design. Suitable for metric roller chain applications requiring a plain bore for custom machining.

# Chains & Sprockets The **PTI 28B-21A Metric Sprocket A-Plate** is an essential component designed for use in various automotive and industrial applications. This high-quality sprocket is crafted to ensure durability and reliability, making it an ideal choice for both original equipment manufacturers and aftermarket replacements. ## Key Features • **Precision Engineering**: Manufactured using advanced plastic injection molding techniques, ensuring high precision and consistency in each unit. • **Metric Sizing**: Designed to meet metric specifications, with a pitch of 28 mm and a bore size tailored for compatibility with various shaft sizes. • **Material Quality**: Made from high-grade engineered plastics, providing superior wear resistance and longevity under demanding conditions. • **Lightweight Design**: Reduces overall weight in mechanical assemblies, contributing to improved efficiency and performance in power transmission systems. • **Easy Installation**: Features a plain bore design for straightforward mounting, enabling quick and hassle-free installation in various setups. ## Applications • **Automotive Industry**: Suitable for use in automotive power transmission systems, enhancing the efficiency of engine components and auxiliary systems. • **Industrial Machinery**: Ideal for various applications in manufacturing equipment, conveyors, and automated systems where reliable motion transfer is crucial. • **Compatibility**: Works seamlessly with other PTI components and standard metric chain systems, ensuring versatile integration into existing assemblies. ## Benefits • **Enhanced Performance**: Offers consistent power transfer and reduces slippage, ensuring optimal operation of machinery and equipment. • **Durability and Reliability**: Engineered to withstand continuous use, minimizing downtime and maintenance costs associated with frequent replacements. • **Cost-Effective Solution**: Provides a high-quality alternative to traditional metal sprockets, combining performance with a competitive price point. --- *Product information compiled with AI assistance for reference purposes.*