An industrial machinery mount is assembled using standard fractional fasteners with bolt h… — Armed Services Vocational Aptitude Battery (ASVAB)

An industrial machinery mount is assembled using standard fractional fasteners with bolt heads measuring $3/4\text{ in}$ . Which tool must be selected to turn these fasteners securely and prevent rounding the bolt heads?

A
A $19\text{ mm}$ box-end wrench
A $3/4\text{ in}$ box-end wrenchCevap
C
A $20\text{ mm}$ combination wrench
D
An $18\text{ mm}$ open-end wrench

Cevap

3/4\text{ in}

box-end wrench

Fasteners must be turned with a wrench of the matching measurement standard and exact size. A

3/4\text{ in}

box-end wrench matches the

3/4\text{ in}

(

0.750\text{ in}

) bolt head perfectly, while the closed box end surrounds the fastener to distribute torque evenly and prevent rounded corners.

Adım Adım Çözüm

Identify the fastener measurement system and exact head size specified.

The fastener is standard fractional SAE measuring

3/4\text{ in}

(

0.750\text{ in}

Fasteners must always be paired with wrenches manufactured in the same measurement standard to ensure an exact fit.

Evaluate potential metric substitutes against the exact SAE dimension.

18\text{ mm} \approx 0.709\text{ in}

(too small),

19\text{ mm} \approx 0.748\text{ in}

(undersized by

0.002\text{ in}

), and

20\text{ mm} \approx 0.787\text{ in}

(oversized by

0.037\text{ in}

Metric wrenches do not perfectly match fractional inch sizes, leading to improper seating, slippage, and fastener damage.

Select the proper tool design and size to apply torque without fastener damage.

3/4\text{ in}

box-end wrench provides full perimeter contact and the exact required dimension.

Using the matching SAE size in a box-end configuration distributes torque evenly across all six points of the fastener.

Anahtar Kavram

Proper SAE Wrench Sizing and Metric Non-Interchangeability

Tahmini Süre:1m 0s

Soru

Cevap

Adım Adım Çözüm

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