Overview
The Martin Quadra-Flex 7H coupling with 5/8 inch PB hub bore is a proven flexible coupling design for industrial power transmission. Quadra-Flex couplings offer long life, torsional flexibility, ease of installation, and withstand misalignment, shock, and vibration. This size 7H unit is widely used in general-purpose machinery, conveyor systems, pump drives, and motor-coupled equipment where moderate speeds and shaft flexibility are required.
Key Features
- 4-way flexible element accommodates angular, parallel, and axial misalignment
- Cast iron construction for durability and long service life
- Easy installation with straightforward assembly procedure
- Low maintenance design with no lubrication requirements on flex element
- PB hub bore type compatible with standard shaft fitting methods
- Size 7H rated for mid-range torque and speed applications
Technical Specifications
- Coupling Size: 7H
- Hub Bore Designation: 5/8 inch PB (Plain Bore)
- Material: High-grade cast iron
- Bore Range: Matches 5/8 inch shaft specifications
- Flexible Element: Elastomer core with metal flanges
- Applications: General machinery, motor couplings, pump drives
Typical Applications
Quadra-Flex couplings are available in sizes 3 through 16 and serve diverse industrial applications. The 7H size is commonly found in:
- AC motor-to-pump couplings in HVAC and utility systems
- Fan and blower drive coupling applications
- Conveyor and material handling equipment
- Machine tool and industrial gearbox input shafts
- General manufacturing automation equipment
Compatibility & Replacements
Compatible With
- Standard fractional-horsepower and integral-horsepower AC motors
- Centrifugal pump housings with matching shaft diameters
- Gearbox input and output shafts rated for 5/8 inch bore
- Industrial fan and blower assemblies
- Compressed air and fluid power drive systems
Replaces / Drop-In Replacement For
Verify compatibility with your equipment manufacturer’s specifications before ordering. Contact our technical team to confirm cross-reference models and ensure proper fit for your application.
Works With
- Standard set screws and keyways for mechanical shaft attachment
- Taper bushings and QD bushed coupling interfaces
- Fixed-bore and bored-to-size shaft configurations
- Industrial automation and machinery control systems
