Anti-Slip Design for Efficient Torque Transmission
The internal star-shaped bore (with 6-12 lobes) perfectly meshes with the bolt head’s convex teeth, increasing contact area by 20% compared to traditional hex keys and reducing torque loss to less than 3%. With the same applied force, it delivers higher torque (e.g., M5 size achieves a maximum of 25N·m), making it ideal for automotive tire security screws and high-strength industrial fasteners. This design prevents bolt damage caused by slipping with ordinary tools.
Precise Fit for Fastener Protection
The star-shaped structure offers high centering accuracy (tolerance ±0.01mm), ensuring precise engagement with the screw’s convex teeth. Stress is evenly distributed across the tooth surface during operation, rather than concentrating on sharp edges. Tests show that when removing aluminum alloy internal star screws, the head wear rate is only 1.5%—far lower than the 8% of hex keys—making it particularly suitable for disassembling precision electronics (e.g., smartphone motherboards, camera lenses).
Compact Structure for Accessing Tight Spaces
The outer diameter is 10%-15% smaller than equivalent hex tools (e.g., T20 size has an outer diameter of only 6mm). Paired with short-handled screwdrivers or extension rods, it can reach ultra-narrow spaces like watch movements or laptop interiors. Some models feature a 90° bent tail for vertical or corner operations, solving the "angle restriction" problem of traditional tools.
Safety Anti-Detachment and Operational Convenience
High-end models include a spring-loaded locking ring that automatically secures onto the screw after insertion, preventing accidental socket detachment (e.g., during overhead work). The handle is equipped with an ergonomic rubber non-slip grip, enhancing holding force by 30% and reducing fatigue during prolonged use.