STANDARD BOLT HOW TO DETERMINE NUT STRENGTH

Nut Type
Present Standard Hexagon Nut Old Standard Hexagon Nut Class
Cold Forging Nut Cutting Processed Nut
A01370P

No Mark

 4N
A01370P

No Mark (w/ Washer)

 A01370P

No Mark (w/ Washer)

 A0138RZ

No Mark

 5N (4T)
A01376D 6N
A0136Z6 A0138VJ 7N (5T)
A0135WQ 8N
A013668 A0135UM A0138EA

No Mark

 10N (7T)
A01377B 11N
A0136JX 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