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Difficulty: EasyBolts, Nuts, and Washers

While assembling a bracket on a vehicle chassis, a mechanic selects a standard hex cap screw that has 3 distinct radial lines stamped onto the top of its head. According to SAE standards, what is the strength grade of this bolt?

  1. A
    Grade 3
  2. Grade 5Answer
  3. C
    Grade 6
  4. D
    Grade 8

Answer

Grade 5
On SAE standard hex head bolts, tensile strength is indicated by radial lines on the head. Adding 2 to the number of radial lines gives the SAE grade. For 3 radial lines, 3+2=53 + 2 = 5, indicating an SAE Grade 5 bolt.

Step-by-Step Solution

1
Count the number of radial slash marks on the hex bolt head.
The bolt head displays 3 radial lines.
SAE (Society of Automotive Engineers) markings use radial lines extending from the center of the bolt head to indicate tensile strength.
2
Apply the standard SAE bolt grade conversion rule: Grade=Number of Radial Lines+2\text{Grade} = \text{Number of Radial Lines} + 2.
3+2=53 + 2 = 5, identifying the fastener as an SAE Grade 5 bolt.
An SAE Grade 2 bolt has no radial marks, so 2 must always be added to the count of radial lines.

Key Concept

SAE Bolt Grade Identification by Radial Lines
Estimated Time:45s
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Topics

Bolts, Nuts, and Washers

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