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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 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:
  1. Bolt = 4T
  2. Nut = 4N or more