Overview
The John Crane T1 1-3/8 mechanical seal is a single-spring cartridge seal designed for reliable performance in centrifugal pumps and rotating equipment. The Type 1 configuration combines proven John Crane engineering with carbon face and Viton secondary seals to deliver consistent leakage control and extended seal life. This 1-3/8″ shaft size assembly is widely used across industrial fluid handling systems requiring dependable sealing without excessive maintenance.
Key Features
- Single-spring design provides stable face loading and eliminates slippage
- Carbon stationary ring and rotating primary face for wear resistance
- Viton (fluorocarbon) elastomer secondary seals ensure compatibility with mineral oils and many synthetic fluids
- Stainless steel spring and metal parts resist corrosion
- Compact cartridge configuration simplifies installation and replacement
- New in box condition—fully functional and ready to deploy
Technical Specifications
- Manufacturer: John Crane
- Seal Type: Type 1 (T1)
- Shaft Size: 1-3/8 inch
- Primary Face Material: Carbon
- Stationary Ring: Ceramic or Silicon Carbide options
- Secondary Seal: Viton (Fluorocarbon)
- Spring Material: Stainless Steel
- Construction: Single-spring cartridge seal
- Standard Mounting: Shaft-mounted or gland-compatible
Typical Applications
- Centrifugal pump sealing (water, light oils, coolants)
- Circulation pumps in HVAC and industrial cooling systems
- Low-to-moderate pressure fluid handling equipment
- Blower and compressor applications
- OEM pump replacements across multiple equipment manufacturers
Compatibility & Replacements
Compatible With
- Standard pump housings with Type 1 cartridge seal cavities
- Gland assemblies designed for John Crane mechanical seals
- Mineral oil-based hydraulic and lubrication systems
- Water and coolant circulation systems
- Equipment from major pump manufacturers (e.g., Grundfos, Goulds, Xylem, SPX)
Replaces / Drop-In Replacement For
- OEM mechanical seals in equivalent 1-3/8″ T1 configurations
- Aftermarket Type 1 seals from competing suppliers
- Original John Crane T1 seals requiring maintenance replacement
- Verify exact pump model compatibility before ordering
Works With
- Standard John Crane seal installation tools and fixtures
- Mineral oil, water, and coolant media
- Pump speeds up to 3600 RPM (standard industrial rating)
- Operating pressures ≤1.4 MPa under typical conditions
- Temperature range: −20°C to +120°C (for standard Viton elastomer)
