Millwright Level 1 Practice Exam

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Practice this question and more.

A standard screwdriver blade maintains a better grip in the slot if the blade is ground slightly:

Flat
Bent
Concave
Convex

The correct answer is: Concave

A standard screwdriver blade is designed to fit snugly into the slot of a screw. When the blade is ground slightly concave, it allows for a better grip by increasing the contact area between the screwdriver and the slot of the screw. This concave shape helps in reducing slippage, especially under torque. The curvature allows the blade to seat more securely within the screw head, and, as a result, it can provide greater torque application while minimizing the risk of damaging the screw or the tool itself. This design enhancement is particularly beneficial when dealing with screws that may be seized or require greater force to turn.