STANDARD BOLT HOW TO DETERMINE NUT STRENGTH

Nut Type
Present Standard Hexagon Nut Old Standard Hexagon Nut Class
Cold Forging Nut Cutting Processed Nut
A01E31G

No Mark

 4N
A01E31G

No Mark (w/ Washer)

 A01E31G

No Mark (w/ Washer)

 A01DYYH

No Mark

 5N (4T)
A01E0QG 6N
A01E0E9 A01E1CZ 7N (5T)
A01DZNK 8N
A01DWFP A01E14O A01DZGN

No Mark

 10N (7T)
A01DWH9 11N
A01DZ0E 12N

Tech Tips


  • *: Nut with 1 or more marks on one side surface of the nut.

  • 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:

  • Bolt = 4T

  • Nut = 4N or more