RITEWAY ROCK PICKER 250, Operator'S Manual & Parts

Page: 23 / 43

17
ROCK PICKER 250
Grade Chart
Specification Material
Size Range
(inches)
Min. Proof
Strength
(psi)
Min. Tensile
Strength
(psi)
Min. Yield
Strength
(psi)
Grade
Identification
Marking
Grade 1
Low or Medium
Carbon Steel
1/4 to 1 - 1/2 33,000 60,000 36,000
Grade 2
1/4 to 3/4
7/8 to 1 - 1/2
55,000
33,000
74,000
60,000
57,000
36,000
Grade 5
Medium Carbon
Steel: Quenched
and Tempered
1/4 to 1
1 - 1/8 to 1 - 1/2
85,000
74,000
120,000
105,000
92,000
81,000
Medium Carbon
Alloy Steel:
Quenched and
Tempered
Grade 8 1/4 to 1 - 1/2 120,000 150,000 130,000
Grade Chart