John Crane PO3-38MM Mechanical Seal with Stationary Seat

John Crane PO3‑38MM is a single‑spring, pusher‑type mechanical seal assembly with stationary seat, designed for reliable shaft sealing in pumps and rotating equipment handling liquids in industrial applications.
Technical specifications
Manufacturer: John Crane International
Manufacturer part number: PO3‑38MM
Product type: Mechanical seal with stationary seat
Seal design: Single spring, pusher type
Seal configuration: Rotary seal head with separate stationary seat
Nominal shaft size: 38 mm
Seal orientation: Inside mounted
Spring type: Single coil spring
Seal face design: Flat mechanical seal faces
Typical rotating face material: Carbon (resin‑impregnated)
Typical stationary face material: Ceramic or silicon carbide (application dependent)
Secondary seal material: Elastomer (commonly NBR, EPDM, or FKM depending on version)
Metal parts material: Stainless steel
Maximum operating pressure: Up to 10 bar (145 psi), dependent on materials and conditions
Maximum operating temperature: −20 °C to +150 °C (dependent on elastomer selection)
Maximum shaft speed: Up to 15 m/s (application dependent)
Direction of rotation: Bi‑directional
Installation type: Component seal
Typical applications: Centrifugal pumps, water pumps, process pumps, general industrial services
Compatible media: Water, light oils, chemicals (material dependent)
Standards compatibility: Designed to industry‑standard mechanical seal dimensions
Country of manufacture: United States Please review pictures carefully and let us know if you have any questions!