With a shank length of only 1/3 to 1/2 that of standard models (50mm), typical specifications include 15mm, 20mm, and 25mm. This allows easy access to "millimeter-level" narrow spaces where traditional tools cannot reach, such as gaps in electrical appliances (e.g., smartphone motherboard screws), furniture interlayers (e.g., drawer track installation), and behind car dashboards.
Right-Angle Operation Optimization
The short shank structure shortens the lever arm. When used with a 90° right-angle wrench adapter, it enables special working conditions of "vertical force application + horizontal operation," such as tightening terminal block screws in the narrow space of a distribution box.
Thickened Shank Design
Despite its ultra-short size, it still uses a full-size 6.35mm hexagonal shank made of chrome-molybdenum-vanadium steel, with a hardness of HRC58-62. The torsional strength is 40% higher than that of ordinary steel of the same size, ensuring stable output of 5-10N·m torque and avoiding bending or slipping caused by insufficient rigidity of the short shank.
Anti-Detachment Structure
The head and shank are formed using an integrated molding process with no welding gaps at the joint. Passing a 500N axial tension test, it eliminates the risk of head detachment in high-frequency vibration scenarios (e.g., when using power tools at high speeds).
Conclusion
The ultra-short series, centered on "small size, great performance," balances a compact structure with enhanced performance, making it a must-have tool for professional technicians in scenarios requiring "space-constrained and precision-first" operations. Its characteristics of "flexibility, reliability, and ease of manipulation" effectively improve work efficiency in special environments, making it an important innovative category in modern precision tool sets.