T21-3/4" Elastomer Bellow Mechanical Seal | Replacement for John Crane Type 21 Water Pump Seal Shaft Size 0.75Inch

T21-3/4″ Elastomer Bellow Mechanical Seal | Replacement for John Crane Type 21 Water Pump Seal Shaft Size 0.75Inch

Price range: $8.50 through $12.50

  • Proven Elastomer Bellows Design
    Features a high-precision elastomer bellows that delivers exceptional sealing reliability and longevity. Effectively minimizes leak paths and downtime by compensating for axial shaft movement and operational vibration in industrial settings.
  • Seamless John Crane Type 21 Replacement
    Engineered as a direct drop-in equivalent for John Crane Type 21. Ensures a perfect fit and immediate OEM-grade performance without any system modifications or adjustments.
  • Precision Engineered for 3/4″ (0.75″) Shafts
    Guarantees a perfect fit and stable, vibration-free operation on standard 3/4″ (0.75″) diameter shafts. Eliminates installation errors and enhances overall operational reliability.
  • Simplify Sourcing & Reduce Costs
    Achieves significant savings on maintenance and inventory without compromising quality. This high-compatibility seal streamlines your supply chain and reduces total cost of ownership compared to original parts.
  • Versatile Industrial Compatibility

    Suitable for a broad range of industrial applications, ensuring stable performance across diverse operating conditions.
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Type 21 General-duty Elastomer Bellows Mechanical Shaft Seal

A benchmark choice for OEM engineering teams, the Type 21 general-purpose mechanical seal is engineered to meet the rigorous demands of industrial rotary equipment.
Core Technical Advantages:
  • Integrated automatic compensation system that accommodates shaft-end play, run-out, primary seal ring wear, and equipment tolerance variations, ensuring consistent sealing performance over the seal’s service life.
Industry & Equipment Fit:
  • Primary applications: Centrifugal, rotary, and turbine pumps; compressors; chillers; and all rotary shaft-driven machinery.
  • Sector-specific use cases: Wastewater treatment facilities, potable water distribution systems, and commercial/industrial HVAC systems—proven to comply with the hygiene and durability requirements of water-related industries.
Weight 1.5 lbs
Dimensions 13 × 8 × 9 in
Material

CAR/CER/NBR, CAR/CER/VIT, CAR/SIC/VIT, SIC/SIC/VIT

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