Elastomer Bellows Mechanical Seal | 1.125 Inch Shaft | Direct Replacement for John Crane Type 21 (Model T21-1 1/8”)

The T21 is a high-performance mechanical seal engineered as a direct replacement for the John Crane Type 21 model, designed specifically for a 1.125-inch (1-1/8″) shaft diameter. It delivers proven reliability and cost-effective sealing for a wide range of industrial rotating equipment.

At the core of its design is a robust elastomer bellows. This critical component provides exceptional flexibility and automatic compensation for axial movement, seal face wear, and minor shaft runout. This inherent resilience ensures stable performance and an extended service life, even in applications with vibration or fluctuating pressures. The unitized, compact construction allows for quick and straightforward installation, minimizing maintenance downtime.

Ideal for pumps, mixers, and other general industrial machinery, the T21 is suitable for handling common media such as water, oils, and mild chemical solutions. By choosing the T21, you secure a sealing solution that matches the performance and durability of the original John Crane specification, but at a more competitive value, making it an intelligent choice for both routine maintenance and equipment upgrades.