Overview
The Madison Electric 150 snap-in blank is a steel-plated conduit fitting designed to cap unused knockout holes in electrical boxes and enclosures. Constructed from a combination of 6/6 nylon and steel with a cadmium-plated finish, these fittings install with fingertip pressure and require no tools. This product is supplied in a convenient bulk box of approximately 100 units, making it ideal for electrical contractors, maintenance technicians, and system integrators managing large-scale installations or ongoing maintenance operations.
Key Features
- Cadmium plated steel construction for corrosion resistance and durability
- 6/6 nylon snap-in design—installs without tools or fasteners
- Fits 1/2″ knockout openings in standard electrical boxes and enclosures
- Bulk box of approximately 100 units for high-volume projects
- Compliant with standard conduit system practice for box/enclosure sealing
Technical Specifications
| Size | 1/2 inch |
| Material | Steel (plated) and 6/6 Nylon |
| Finish | Cadmium Plated |
| Type | Snap-In Blank |
| Quantity per Box | Approximately 100 units |
| Installation Method | Snap-in (tool-free) |
| Country of Origin | China |
| Manufacturer | Madison Electric Products (Southwire Company) |
Typical Applications
- Sealing unused 1/2″ knockout holes in electrical junction boxes
- Closing conduit knockouts in control enclosures and cabinets
- Maintaining NEC-compliant box integrity and environmental protection
- Large residential, commercial, and industrial electrical installations
- Maintenance and retrofit work in existing electrical systems
Compatibility & Replacements
Compatible With
- Standard electrical junction boxes with 1/2″ knockouts
- Rigid and IMC conduit systems
- Electrical enclosures and control cabinets
- PVC and steel conduit box entries
Replaces / Drop-In Replacement For
- Madison Electric 150 (original specification)
- Southwire 150 snap-in blank (same manufacturer, alternative branding)
Works With
- All standard 1/2″ knockout conduit and box configurations
- Complies with National Electrical Code (NEC) requirements for box closure
- Integrates with complete Madison Electric snap-in blank line (151 3/4″, 152 1″, 153 1-1/4″, 154 1-1/2″)
