STANDARD BOLT HOW TO DETERMINE NUT STRENGTH

Nut Type
Present Standard Hexagon Nut Old Standard Hexagon Nut Class
Cold Forging Nut Cutting Processed Nut
B000IBO

No Mark

 - - 4N
B000IBO

No Mark (w/ Washer)

 B000IBO

No Mark (w/ Washer)

 B000KAP

No Mark

 5N (4T)
B000NEL - - 6N
- B000KF7 B000HQT 7N (5T)
B000MBC - - 8N
B000L24 B000MLQ B000NAC

No Mark

 10N (7T)
B000MBR - - 11N
B000IZZ - - 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