Professional-grade 3/8" drive 9/16" non-spline torque adaptor with locking hole system, 12-point configuration, and 1,050 in-lb working torque for precision fastening in restricted spaces.
The Snap-on Tools@Height 3/8" Drive 9/16" Non-Spline Torque Adaptor (Model THFRDH181) is a precision-engineered tool designed for professional mechanics and technicians requiring reliable torque applications in restricted spaces. This adaptor features a unique locking hole system on all four sides that works in combination with a locking pin to significantly reduce the risk of misaligning the socket, adaptor, or extension onto the drive tool. The double hex 12-point configuration allows the socket to engage single hex fasteners every 30 degrees rather than every 60 degrees, providing superior access in confined working areas where standard tools cannot reach.
Crafted from special alloy steel and heat-treated to exacting standards, this torque adaptor delivers optimum strength and durability for demanding industrial applications. The nickel-chrome finish provides excellent corrosion resistance and allows for easy cleaning and maintenance. With a 1,050 inch-pound working torque capacity, this adaptor is suitable for a wide range of fastening tasks across aviation, aerospace, military, defense, oil and gas, power generation, railroad, and general industry applications. The radius edges are specifically designed to resist damage and nicks during regular use.
The adaptor features center-to-center length markings for easy and accurate torque calculations, ensuring precision in every application. At just 0.1 pounds, it is lightweight yet robust, making it ideal for technicians working at heights or in overhead positions. This non-spline design provides compatibility with standard 3/8" drive tools and is backed by Snap-on's reputation for quality and reliability in professional tool manufacturing.
Key Features
- Locking hole system on all four sides reduces misalignment risk of socket, adaptor, and extension
- Double hex 12-point configuration enables socket engagement every 30 degrees for better restricted area access
- Precision-crafted from special alloy steel with heat treatment for maximum strength and durability
- Nickel-chrome finish provides superior corrosion resistance and easy cleaning
- 1,050 inch-pound working torque capacity suitable for professional industrial applications
- Radius edges designed to resist damage and nicks during regular use
- Center-to-center length markings for accurate torque calculations
- Lightweight at 0.1 pounds, ideal for overhead and height work applications
Technical Specifications
| Specification |
Value |
| Model Number | THFRDH181 |
| Drive Size | 3/8 inch |
| Socket Size | 9/16 inch |
| Design Type | Non-Spline, Double Hex 12-Point |
| Working Torque Capacity | 1,050 inch-pounds |
| Material | Special Alloy Steel, Heat-Treated |
| Finish | Nickel-Chrome |
| Dimension A (Head Diameter, Wrench End) | 0.825 inches |
| Dimension B (Head Diameter, Square End) | 0.750 inches |
| Dimension C (Head Depth, Wrench End) | 3/8 inch |
| Dimension D (Head Depth, Square End) | 7/16 inch |
| Dimension E (Length, Center to Center) | 2 inches |
| Weight | 0.1 pounds (0.05 kilograms) |
| Locking System | Four-Side Locking Hole with Pin |
| Brand | Snap-on Tools |
| Product Line | Tools@Height |
| Warranty | Snap-on Professional Tool Warranty |
