College

**NCCER 00104 Introduction to Power Tools**

Which is a low-velocity fastening system used to drive steel pins or threaded studs into masonry and steel?

A. Mini hammer drill
B. Pneumatic screw nailer
C. Air impact wrench
D. Powder-actuated tool

Answer :

Final answer:

The correct answer is the powder-actuated tool, which is designed for low-velocity fastening into masonry. Other options are either unsuitable for this purpose or designed for different tasks. This tool uses small cartridges to drive fasteners efficiently.


Explanation:

Understanding Low-Velocity Fastening Systems

In construction and masonry work, a low-velocity fastening system is crucial for effectively driving materials such as steel pins or threaded studs into hard surfaces like concrete or brick. The options provided include:

  • Mini hammer drill: Typically used for drilling holes rather than fastening.
  • Pneumatic screw nailer: Functions with air pressure but is more suited for driving screws
  • Air impact wrench: Primarily used for loosening or tightening fasteners.
  • Powder-actuated tool: This system uses small cartridges to propel fasteners into hard materials; it is specially designed for tasks that involve driving into masonry.

The correct tool in this context is the powder-actuated tool, as it is explicitly designed for low-velocity fastening, providing sufficient force to embed pins or studs into tough substrates without damaging them.


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