When purchasing tools, we often worry whether the tool we bring home will be suitable for our work, or if its functions are different from what we imagined. But this time, we are pleased to introduce Buckley from Midlothian, Texas, a professional tester with many years of mechanical maintenance experience, to share with us his practical review of the pneumatic wrench NC-4650HB. If you are looking for a suitable pneumatic wrench, you might want to keep reading.
Product Introduction: Mighty Seven 1/2 Inch Drive EZ-Lube Mini Impact Wrench
Model: NC-4650HB
Lubrication System: Features the company’s patented EZ-Lube system designed to extend the tool’s lifespan and efficiency.
Operating Pressure: Operates at 90 psi, achieving a maximum reverse torque of 650 foot-pounds in just five seconds.
Maintenance: Offers a time-saving and efficient self-maintenance method.
Warranty Policy: Provides a three-year warranty service.
Tester Background Introduction: Buckley
Identity: Owner and chief technician at My Father’s Shop, Midlothian, Texas. Buckley has many years of mechanical maintenance experience, especially skilled in working in tight spaces. His deep understanding of tool maintenance and efficiency makes him an ideal candidate to assess this mini impact wrench.
Professional Review and Usage Experience
- Compactness: Buckley notes that the tool’s head is extremely compact, slightly larger than a palm, making it ideal for operations in narrow spaces.
- Practical Scenarios: Particularly suitable for removing caliper support back bolts and shock absorber bolts in suspension systems.
- Speed Adjustment: The back of the tool offers three speed settings, with easy adjustment for both forward and reverse.
- Innovative Lubrication Method: Includes a syringe and grease, lubricating through injection into a hole at the front of the hammer, simplifying the maintenance procedure.
Buckley’s Perspective
Buckley believes that the tool’s unique lubrication method not only facilitates operation but also reduces the time and effort required for tool repairs. He emphasizes that compared to traditional lubrication methods, the EZ-Lube system is more intuitive and easy to implement, greatly enhancing maintenance convenience.
Advanced Product Features
Patented Lubrication System: Mighty Seven’s EZ-Lube system not only simplifies the maintenance process but also allows users to quickly complete lubrication on the job site without specialized equipment or additional tools. This is in stark contrast to the traditional lubrication method using a grease gun, which is often more time-consuming and cumbersome.
Powerful Torque and Quick Response: The mini impact wrench can reach a maximum reverse torque of 650 foot-pounds within five seconds, significantly improving operational efficiency. This quick response capability is particularly important for situations that require fast handling of sturdy or overly tight bolts, making it perform excellently in emergencies.

Comparative Differentiation: In Comparison with Other Similar Products
Compared to other similar products on the market, the Mighty Seven mini impact wrench has some unique advantages including:
- Higher Maneuverability and Flexibility: Its compact design enables operation in tight spaces, especially encountered in automotive repairs and mechanical maintenance.
- Easy Maintenance: The EZ lubrication system provides a clear, simple lubrication process, significantly reducing the maintenance burden on technicians compared to traditional lubrication methods that require cumbersome setups.
- Noise Control: Despite its power, it operates with lower noise, suitable for use in noise-sensitive environments such as residential areas or during night operations.
Testing Details and Practicality Assessment
During actual testing, Buckley specifically mentioned several practical details:
- Convenience of Speed Adjustment: The speed adjustment knob at the back of the tool is positioned for easy operation, allowing users to adjust quickly even while wearing gloves, which is very practical for users who need to frequently change operation speeds.
- Lubrication Efficiency: Due to the simple and direct lubrication process, Buckley found that the tool’s performance was more stable during continuous use, reducing wear or malfunction caused by improper lubrication.
Summary and Recommendation
Overall, the Mighty Seven 1/2 inch drive EZ-lube mini impact wrench stands out among similar products due to its design, performance, and maintenance features. For professional technicians seeking high efficiency and convenient maintenance, this tool is undoubtedly a quality choice. If you want to experience its excellent performance firsthand, consider watching Buckley’s video review to see the tool in action and its effects.
Watch Buckley’s video review of the Mighty Seven 1/2″ Drive Air impact wrench with a patent grease hole NC-4650H to understand the actual use of the tool.
Article Citation: Tool Review: Mighty Seven 1/2″ Drive EZ Grease Mini Impact Wrench