Professional 9/16–5/8" SAE Flank Drive® Half-Moon Box Wrench with 12-point design. Delivers 15-20% more turning power with superior corrosion-resistant nickel-chrome finish. ASME® B107.100 certified.
The Snap-on 9/16–5/8" 12-Point SAE Flank Drive® Half-Moon Box Wrench (Model CX1820) is a professional-grade tool engineered for demanding industrial and automotive applications. This premium wrench features the innovative Flank Drive® wrenching system on the box-end, which delivers up to 15-20% more turning power compared to conventional wrenches while significantly reducing the risk of tool or fastener damage. The half-moon design provides optimal comfort and balance in your hand during extended use, making it ideal for technicians and maintenance professionals who demand precision and reliability.
Constructed with tough, durable nickel-chrome plating, this wrench produces a mirror-like finish that provides excellent corrosion protection and ensures easy cleaning and maintenance. The 12-point design allows for versatile fastening capabilities across multiple applications. With a total length of 6-1/2 inches and a handle radius of 2-9/16 inches, this tool is perfectly proportioned for both accessibility and leverage. The wrench meets ASME® B107.100 standards, ensuring compliance with industry specifications and quality benchmarks.
This SAE-sized wrench (9/16–5/8 inches) is an essential addition to any professional tool collection, offering superior performance in aviation & aerospace, military & defense, oil and gas, power generation, railroad, and general industry applications. Whether you're working on critical equipment or routine maintenance tasks, the Flank Drive® Half-Moon Box Wrench delivers the durability, performance, and precision that professionals expect from Snap-on tools.
Key Features
- Flank Drive® wrenching system provides up to 15-20% more turning power than conventional wrenches
- 12-point design allows versatile fastening capabilities across multiple applications
- Half-moon shape provides optimal comfort and balance during extended use
- Tough nickel-chrome plating with mirror-like finish for excellent corrosion protection
- ASME® B107.100 certified for industry standard compliance and quality assurance
- 6-1/2 inch length with 2-9/16 inch handle radius for ideal leverage and accessibility
- Reduces risk of tool and fastener damage with precision engineering
- Easy to clean and maintain due to professional chrome finish
Technical Specifications
| Specification |
Value |
| Model Number | CX1820 |
| Size | 9/16–5/8 inches SAE |
| Style | 12-Point Half-Moon Box Wrench |
| Outside Diameter (Dimension A) | 13/16–7/8 inches |
| Head Depth (Dimension C) | 11/32–3/8 inches |
| Total Length (Dimension E) | 6-1/2 inches |
| Handle Radius (Dimension F) | 2-9/16 inches |
| Finish | Chrome (Nickel-Chrome Plating) |
| Standards Compliance | ASME® B107.100 |
| Wrenching System | Flank Drive® Technology |
| Performance Advantage | 15-20% more turning power than conventional wrenches |
| Material | Chrome-plated alloy steel |
| Applications | Aviation & Aerospace, Military & Defense, Oil and Gas, Power Generation, Railroads, General Industry, Heavy Duty & Fleet Maintenance |
| Warranty | Snap-on Limited Lifetime Warranty |
