Size Grade 40 Grade 60
3/8 , # 3, 10 mm 74,000 70,000
1/2 , #4 , 12mm 68,000 72,000
5/8 , #5, 16mm 69,000 72,000
3/4 , #6 , 20mm 69,000 72,000
7/8 , # 7 , 22mm 69,000 75,000
1″ , #8 , 25 mm 69,000 73,000