Why can using the wrong screw size become a structural problem

Plain-English answer

The journeyman requests a box of heavy #10 hex-head structural screws to anchor a heavy VAV box bracket. You grab a random box of short, lightweight #6 pan-head drywall screws from the gang-box instead.

Fasteners are not interchangeable. Use the screw/bolt size called out by the foreman, shop standard, manufacturer, or approved detail for the load. The likely recovery is to check the condition, correct prep/setup if it is within your assignment, and bring the foreman clean information before the work creates rework overhead.

Ask Foreman

Verify before acting

Use this as training guidance. Foreman direction, approved drawings, project specs, manufacturer instructions, employer safety policy, and AHJ/code requirements always control the final answer.

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