Millwright Level 1 Practice Exam

In steel, what is the general rule of thumb for the placement and depth of fasteners using a low velocity tool?

1. 1/4" from the edge, 1" apart and 1/2" deep

2. 1/2" from the edge, 2" apart and 1/4" deep

3. 3/4" from the edge, 1.5" apart and 3/8" deep

4. 1" from the edge, 1" apart and 1/2" deep

The correct answer is: 1/2" from the edge, 2" apart and 1/4" deep

The recommended placement and depth of fasteners using a low velocity tool in steel is typically more conservative to ensure structural integrity and prevent weakening of the material. The correct answer indicates a distance of 1/2" from the edge, which helps prevent edge failure and ensures adequate holding strength. Additionally, spacing the fasteners 2" apart allows for even distribution of stress and reduces the risk of creating weak points along the material. The depth of 1/4" is appropriate as it provides enough engagement for a secure hold without compromising the material's integrity. In contexts where fasteners are too close to the edge or spaced too closely together, the risk of splitting or damaging the material increases. A spacing of 1" between fasteners may lead to excessive concentration of stress in certain areas, while insufficient depth could mean the fasteners do not provide adequate holding power. Therefore, the guidance provided in the correct answer reflects an understanding of both the physical properties of steel and the importance of proper fastener placement in maintaining the overall strength and durability of the assembly.