How To Determine Nut Strength

Nut Type 

Fig 1: Present Standard Hexagon Nut Reference Chart

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HINT:

• *: 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