STANDARD BOLT HOW TO DETERMINE NUT STRENGTH

Nut Type
Present Standard Hexagon Nut Old Standard Hexagon Nut Class
Cold Forging Nut Cutting Processed Nut
A019PIU

No Mark

 - - 4N
A019PIU

No Mark (w/ Washer)

 A019PIU

No Mark (w/ Washer)

 A019JXT

No Mark

 5N (4T)
A019P4W - - 6N
- A019K33 A019KKY 7N (5T)
A019KYF - - 8N
A019NS6 A019MWV A019PI3

No Mark

 10N (7T)
A019N4C - - 11N
A019KTK - - 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