Chemical Compositions

Grade MaterialSimilar to.. C Max Mn Max P Max S Max Si Max Cr Ni Mo
A2 / B8
A4 / B8M
AISI 304 0.08 2.00 0.05 0.030 1.00 17.00-20.00 8.0-13.0
AISI 316 0.08 2.00 0.05 0.030 1.00 16.00-18.50 10.0-14.4 2.00-3.00

Physical Properties

Grade Standard Property Class Tensile Strengtd
Min. (N/mm2)
Yield Strengtd 0.2%
Offset Min. (N/mm2)
Elongation After
Fracture AL mm Min.
A2 & A4 ISO 3506 70 700 450 0.4d
80 800 600 0.3d
Grade Standard Property Class Diameter In. Tensile Strengtd
Min.(KSI)
Yield Strengtd 0.2%
Offset Min. (KSI)
Elongation
In 4D min.%
Reduction Of
Area Min%
Hardness (Max.)
Rockwell
B8
B8M
ASTMA193/A193M Class1
Class2
Class1
Class2
All 75 30 30 50 B96
To 3/4 125 100 12 35 C35
Over 3/4 to 1 115 80 15 35 C35
All 75 30 30 50 B96
To 3/4 110 96 15 45 C35
Over 3/4 to 1 100 80 20 45 C35

Torsional Strength as Per ISO 3506

For Self Tapping Screw

Thread ST 2.2 ST 2.6 ST 2.9 ST 3.3 ST 3.5 ST 3.9 ST 4.2 ST 4.8 ST 5.5 ST 6.3 ST 8
Min Torsional
Strengtd Nm
0.45 0.9 1.5 2 2.7 3.4 4.4 6.3 10 13.6 30.5

For Austenitic Bolts and Screws M1.6 to M16 (Coarse Thread)

Thread M1.6 M2 M2.5 M3 M4 M5 M6 M8 M10 M12 M16
Min.
Breaking Torque,
Mbmin. –Nm
Property
Class
70 0.20 0.4 0.9 1.6 3.8 7.8 13 32 65 110 290
80 0.24 0.48 0.96 1.8 4.3 8.8 15 37 74 130 330