Overview
The Chesterton 685712 spare parts kit provides replacement components for the industry-standard 442 split mechanical seal. The 442 is engineered for equipment that is difficult and time-consuming to disassemble, such as large pumps, vertical pumps, and horizontal split-case pumps. This kit (part number 685712) is configured for a 2.750″ (70M metric) shaft diameter and includes all sealing elements, springs, and hardware necessary for complete seal restoration without removing the pump from service.
Key Features
- Split design installation – Complete seal replacement without equipment teardown, reducing maintenance costs and production downtime
- Ball-and-socket O-Ring design – Quick, easy assembly without adhesives or special tools
- Captive fasteners – Screws remain secured during installation, preventing loss and ensuring reliable assembly
- Compact, proven platform – The 442 is Chesterton’s flagship split seal, supporting pressures from vacuum to 30 bar g (450 psig)
- Complete kit contents – Includes rotary and stationary seal faces, springs, gland components, and O-rings for full restoration
- Wide fluid compatibility – Suitable for a broad range of process fluids and industrial applications
Technical Specifications
| Shaft Diameter | 2.750″ (70 mm) |
| Seal Model | 442 Split Mechanical Seal |
| Kit Type | Spare Parts Kit (Repair/Replacement) |
| Part Number | 685712 |
| Manufacturer | A.W. Chesterton Company |
| Pressure Rating | 0–30 bar g (0–450 psig) |
| Installation Method | Split seal (no disassembly required) |
| Material Compatibility | Wide range of industrial fluids and chemicals |
| Condition | New in Box |
| Design Features | Captive fasteners, ball-and-socket O-rings, axial gland tabs |
Typical Applications
- Centrifugal pump maintenance and repair
- Horizontal and vertical split-case pump sealing
- Large-diameter rotating equipment requiring minimal downtime
- HVAC, water circulation, and industrial process pump systems
- Scheduled seal replacement and preventive maintenance programs
Compatibility & Replacements
Compatible With
- Chesterton 442 split mechanical seal assemblies
- Pump equipment with 2.750″ (70 mm) shaft diameter
- Split-case pumps, vertical turbine pumps, and large centrifugal pumps
- Standard pump gland and stuffing box configurations
Replaces / Drop-In Replacement For
- Original equipment manufacturer (OEM) 442 spare parts kits for 2.750″ shaft applications
- Worn or damaged 442 seal component sets
Works With
- Any pump or rotating equipment currently equipped with or requiring a Chesterton 442 split seal for the 2.750″ shaft size
- Chesterton installation tools and gland assemblies (verify equipment compatibility with your maintenance technician or system integrator)
- Wide range of industrial fluids, water, oils, and compatible chemical solutions
