STANDARD BOLT HOW TO DETERMINE NUT STRENGTH
| 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 |
Tech Tips
-
*: 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.
-
Bolt = 4T
-
Nut = 4N or more
Example: