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Difficulty: EasyWrenches

A worker is tightening an 8 mm8\text{ mm} hexagonal bolt on a piece of shop machinery. Which wrench should be selected to ensure a proper fit and avoid rounding the fastener head?

  1. An 8 mm8\text{ mm} metric wrenchAnswer
  2. B
    A 5/16 in5/16\text{ in} fractional SAE wrench
  3. C
    A 3/8 in3/8\text{ in} fractional SAE wrench
  4. D
    A 1/4 in1/4\text{ in} fractional SAE wrench

Answer

An 8 mm8\text{ mm} metric wrench
Metric fasteners require corresponding metric tools. An 8 mm8\text{ mm} metric wrench fits snugly across the flats of an 8 mm8\text{ mm} bolt, ensuring full torque transfer without slipping or damaging the fastener.

Step-by-Step Solution

1
Identify the fastener measurement standard and nominal size.
The fastener is identified as an 8 mm8\text{ mm} metric hexagonal bolt.
Fasteners require tools that match their exact dimensional system (metric vs. fractional SAE).
2
Select the wrench designed specifically for that size and unit standard.
An 8 mm8\text{ mm} metric wrench provides an exact surface-to-surface fit.
Using fractional SAE tools on metric fasteners introduces loose tolerances that round off the fastener corners under torque.

Key Concept

Metric and SAE Fastener Sizing Compatibility
Estimated Time:40s
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Topics

Wrenches

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