HOW TO DETERMINE BOLT STRENGTH
BOLT TYPE Hexagon Head Bolt Stud Bolt Weld Bolt Class Normal Recess Bolt Deep Recess Bolt No Mark No Mark No Mark 4T 5T w/ Washer w/ Washer 6T 7T 8T 9T 10T 11T
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HOW TO DETERMINE NUT STRENGTH
NUT TYPE Present Standard Hexagon Nut Old Standard Hexagon Nut Class Cold Forging Nut Cutting Processed Nut No Mark - - 4N No Mark (w/ Washer) No Mark (w/ Washer) No Mark 5N (4T) - - 6N - 7N (5T) - - 8N No Mark 10N (7T) - - 11N - - 12N
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Scheme 7
HINT
- *: Nut with 1 or more marks on one side surface of the nut.
- Use a nut with the same nut strength classification number (or more) as the bolt strength classification number when tightening parts with a bolt and nut.
Example
- Bolt = 4T
- Nut = 4N or more