A technician is servicing shop equipment assembled with metric hardware and needs to loose… — Armed Services Vocational Aptitude Battery (ASVAB)

A technician is servicing shop equipment assembled with metric hardware and needs to loosen a bolt head labeled $10\text{ mm}$ . To turn the fastener without slipping and rounding its corners, which tool should the technician select?

A
A $3/8\text{ in}$ fractional wrench
A $10\text{ mm}$ metric wrenchAnswer
C
A $7/16\text{ in}$ fractional wrench
D
A $1/2\text{ in}$ fractional wrench

Answer

10\text{ mm}

metric wrench

10\text{ mm}

metric wrench is specifically manufactured to fit the exact flat-to-flat dimensions of a

10\text{ mm}

fastener head, ensuring complete contact and eliminating slippage.

Step-by-Step Solution

Identify the fastener sizing system and dimension

The bolt head requires a

10\text{ mm}

tool.

Metric fasteners must be paired with metric tools because fractional SAE sizes do not correspond to exact millimeter increments.

Evaluate potential fractional SAE substitutes against the

10\text{ mm}

size

3/8\text{ in} \approx 9.53\text{ mm}

(too small) and

7/16\text{ in} \approx 11.11\text{ mm}

(too loose).

Attempting to substitute standard SAE wrenches on metric fasteners leads to either tool refusal or rounded corners.

Select the exact matching wrench

Choose the

10\text{ mm}

metric wrench.

An exact match provides full contact along the hexagonal flats for secure torque transfer.

Key Concept

Matching fastener sizing standards (Metric vs. SAE) to prevent tool slippage and fastener damage

Estimated Time:45s

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

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