HOW TO DETERMINE NUT STRENGTH

Specifications

Nut Type 

Present Standard Hexagon Nut	Old Standard Hexagon Nut		Class
	Cold Forging Nut	Cutting Processed Nut
No Mark			4N
No Mark (w/ Washer)	No Mark (w/ Washer)	No Mark	5N (4T)
			6N
			7N (5T)
			8N
		No Mark	10N (7T)
			11N
			12N

HINT:

1. *: Nut with 1 or more marks on one side surface of the nut.
   
2. 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:

1. Bolt = 4T
   
2. Nut = 4N or more