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STANDARD BOLT HOW TO DETERMINE NUT STRENGTH

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Table 1. Nut Type
Present Standard Hexagon Nut Old Standard Hexagon Nut Class
Cold Forging Nut Cutting Processed Nut
A017FMT

No Mark

 - - 4N
A017FMT

No Mark (w/ Washer)

 A017FMT

No Mark (w/ Washer)

 A017C8W

No Mark

 5N (4T)
A017E13 - - 6N
- A017BL9 A017FSO 7N (5T)
A017EIR - - 8N
A017CC6 A017D80 A017C0F

No Mark

 10N (7T)
A017G45 - - 11N
A017B0D - - 12N
Tip:

  • *: 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