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Difficulty: EasyBolts, Nuts, and Washers

To determine the SAE grade rating of a standard hex head steel bolt, what calculation is applied to the number of radial slash lines stamped on the bolt head?

  1. A
    Count the number of radial lines directly without adding any value
  2. Add 2 to the number of radial linesAnswer
  3. C
    Multiply the number of radial lines by 2
  4. D
    Subtract 2 from the number of radial lines

Answer

Add 2 to the number of radial lines
Under SAE (Society of Automotive Engineers) specifications, the strength grade of a steel hex bolt is determined by counting the radial slash marks on the bolt head and adding 2. For instance, a bolt with zero lines is Grade 2, a bolt with 3 lines is Grade 5, and a bolt with 6 lines is Grade 8.

Step-by-Step Solution

1
Recall the SAE J429 standard for identifying bolt tensile strength grades from head markings.
Recognize that radial slash lines radiating from the center of an SAE hex head indicate tensile strength.
Standardized markings allow mechanics to verify fastener load capabilities quickly.
2
Apply the standard formula: SAE Grade=Number of Radial Lines+2\text{SAE Grade} = \text{Number of Radial Lines} + 2.
Adding 2 to the line count yields the correct SAE grade (0 lines = Grade 2, 3 lines = Grade 5, 6 lines = Grade 8).
The baseline standard grade (Grade 2) has zero markings, establishing the offset of 2.

Key Concept

SAE Bolt Grade Identification Rule
Estimated Time:30s
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Topics

Bolts, Nuts, and Washers

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