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Difficulty: EasyWrenches

An automotive student is replacing a suspension control arm bolt specified as a 5/8 in5/8\text{ in} standard fastener. Which wrench provides the exact fit required to tighten the bolt safely without rounding the fastener head?

  1. A
    16 mm16\text{ mm} metric wrench
  2. B
    15 mm15\text{ mm} metric wrench
  3. 5/8 in5/8\text{ in} combination wrenchAnswer
  4. D
    17 mm17\text{ mm} metric wrench

Answer

5/8 in5/8\text{ in} combination wrench
The 5/8 in5/8\text{ in} combination wrench is engineered specifically to fit a standard 5/8 in5/8\text{ in} (0.625 in0.625\text{ in}) hex bolt. Using the exact SAE fractional size ensures full contact across the bolt flats, distributing torque evenly and preventing head damage.

Step-by-Step Solution

1
Identify the fastener measurement system and nominal dimension.
The fastener is a standard SAE fractional bolt measuring 5/8 in5/8\text{ in} (0.625 in0.625\text{ in} or 15.875 mm15.875\text{ mm}) across the flats.
Correct tool selection requires matching the fastener measurement system (SAE fractional vs. metric).
2
Select the wrench designed specifically for the fastener size.
A 5/8 in5/8\text{ in} combination wrench provides the precise fit needed to seat against the fastener flats.
Using metric wrenches on SAE hardware introduces improper clearances that lead to fastener rounding and tool slippage.

Key Concept

Matching SAE fractional fasteners with correct SAE wrenches
Estimated Time:45s
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Topics

Wrenches

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