STANDARD BOLT > HOW TO DETERMINE NUT STRENGTH



Nut Type 
Present Standard Hexagon Nut
Old Standard Hexagon Nut
Class
Cold Forging Nut
Cutting Processed Nut
B110716
No Mark


4N
B110716
No Mark (w/ Washer)
B110716
No Mark (w/ Washer)
B110717
No Mark
5N (4T)
B110718


6N

B110719
B110720
7N (5T)
B110721


8N
B110722
B110723
B110724
No Mark
10N (7T)
B110725


11N
B110726


12N

HINT:
  1. *: Nut with 1 or more marks on one side surface of the nut.
  2. Use the nut with the same number of the nut strength classification or greater than the bolt strength classification number when tightening parts with a bolt and nut.
Example:
  1. Bolt = 4T
  2. Nut = 4N or more