How To Determine Nut Strength

Nut Type 

Fig 1: Nuts Specification Chart

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HINT

• *. Nut with 1 or more marks on one side surface of the nut.
• Use a nut with the same nut strength classification number (or greater) as the bolt strength classification number when tightening parts with a bolt and nut.

Example:

• Bolt = 4T
• Nut = 4N or more