Overview
The McMasters Koss Q4343-366Y sealing ring is an industrial-grade seal designed for demanding fluid power applications. Supplied as a pack of four units, this product comes from McMasters Koss Company, a TS16949 and ISO 9001 registered manufacturer specializing in o-rings, gaskets, oil seals, and custom molded sealing components. With over 40 years of automotive OEM and industrial supply experience, McMasters Koss delivers precision-engineered sealing solutions for hydraulic, pneumatic, automotive, heavy equipment, and general industrial maintenance applications.
Key Features
- Precision-manufactured sealing ring for dynamic and static sealing applications
- Pack of four rings for cost-effective stocking and replacement
- ISO 9001 and TS16949 certified manufacturing quality
- Designed for hydraulic and pneumatic system performance
- Suitable for automotive, industrial, and equipment maintenance use
Technical Specifications
- Manufacturer: McMasters Koss Company
- Model Number: Q4343-366Y
- Package Quantity: 4 rings per bag
- Product Type: Industrial sealing ring
- Certification: TS16949, ISO 9001 registered
- Application Class: Hydraulic and pneumatic seals
Typical Applications
The McMasters Koss Q4343-366Y ring is commonly used in:
- Hydraulic and pneumatic cylinder assemblies
- Fluid power equipment maintenance and repairs
- Automotive OEM manufacturing and aftermarket service
- Heavy equipment and industrial machinery sealing
- Production line downtime reduction and preventive maintenance
Compatibility & Replacements
Compatible With
- Hydraulic and pneumatic fluid power systems
- Standard piston and rod sealing applications
- OEM automotive and heavy equipment assemblies
- Industrial maintenance and repair operations
Replaces / Drop-In Replacement For
Verify compatibility with your equipment documentation or system integrator before ordering to confirm this model is the correct replacement for your application.
Works With
- Standard hydraulic fluids and mineral oils
- Pneumatic system air media
- OEM seal kits and component assemblies






