1. Drive Square Size:
Common sizes include 3/8", 1/4", and 1/2". The 3/8" drive is the mainstream international standard offering the greatest versatility, making it the top choice for small-to-medium bolts in automotive repair. The 1/4" drive is suitable for tight spaces and precision work, while the 1/2" drive accommodates large sockets and heavy-duty bolts.
2. Rated Voltage:
12V/16.8V models are typically lightweight options for home use. The 20V platform offers more power and longer runtime, making it suitable for professional automotive repair and high-volume assembly/disassembly tasks; it is also the mainstream standard for cordless power tools overseas.
3. Maximum Torque:
The most critical metric (measured in Nm or Ft-lbs). Higher torque indicates a greater capacity for removing heavy-duty bolts. Note: Distinguish between maximum torque and continuous working torque; do not focus solely on peak figures.
4. Key Features and Configuration:
Forward/reverse switching, built-in LED light (for dim spaces), battery level indicator, safety lock (to prevent accidental activation), and overload protection. These features directly impact safety and convenience. Also, consider the motor type: brushed vs. brushless.
5. No-Load Speed & Speed Control:
No-load speed is measured in RPM. A variable-speed trigger allows the user to adjust speed based on working conditions-low speed for precision tightening and high speed for rapid assembly/disassembly.
6. Overall Dimensions and Weight:
Focus on total length, net weight, and packaging method, as these factors influence shipping methods and costs for the buyer.
7. Housing Material:
Fiberglass-reinforced nylon offers excellent toughness and impact resistance, making it less likely to crack from knocks on construction sites or in auto repair shops, whereas standard plastic housings tend to be less durable.
8. Applicable Working Conditions:
Distinguish between DIY home use, automotive repair, and industrial equipment maintenance. Match the product to the target customer's usage scenario: home use does not require ultra-high torque, whereas automotive repair requires a balance of torque and a compact tool body.
