STANDARD BOLT HOW TO DETERMINE NUT STRENGTH

Nut Type
Present Standard Hexagon Nut Old Standard Hexagon Nut Class
Cold Forging Nut Cutting Processed Nut
A004452

No Mark

 - - 4N
A004452

No Mark (w/ Washer)

 A004452

No Mark (w/ Washer)

 A0042KW

No Mark

 5N (4T)
A0044BE - - 6N
- A00409A A0040ZX 7N (5T)
A0042Q4 - - 8N
A0042QH A0043TW A0041GU

No Mark

 10N (7T)
A0042R7 - - 11N
A0042HT - - 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.


    Example:

  • Bolt = 4T

  • Nut = 4N or more