ASTM F568 Grade 8.8 Screws, ASTM F568 Grade 8.8 Studs, ASTM F568 Grade 8.8 Bolts, ASTM F568 Grade 8.8 Threaded Rods Supplier in Mumbai, India.
The 8.8 Grade Bolt standard covers all high-tensile fasteners such as bolts, screws, and Studs. The thread structure on this sort of 8.8 Bolt could be coarse or fine pitch. Low to medium carbon Alloy Steel was used to make the standard Grade 8.8 Bolts. These steel grades are less expensive and less durable. The tensile strength of the 8.8 Hex Bolt is roughly 420 Mpa for low carbon steel and 500 Mpa for medium carbon steel when partially or fully annealed, and its core hardness in terms of Rockwell is between B71 and 95. Carburizing can increase the surface hardness of the 8.8 Metric Bolt.
Chemical Composition
| CLASS |
MATERIAL AND TREATMENT |
C |
C |
P |
S |
B |
TEMPERING TEMP. [C] |
| MIN |
MAX |
MAX |
MAX |
MAX |
| Grade 8.8 Bolt |
CARBON STEEL WITH ADDITIVES (E.G. B, MN OR CR) QUENCHED AND TEMPERED |
0.15 (D) |
0.4 |
0.025 |
0.025 |
0.003 |
425 |
| CARBON STEEL QUENCHED AND TEMPERED |
0.25 |
0.55 |
0.035 |
0.025 |
Mechanical Properties
| Grades |
Size Range |
PS [MPa] |
YS (min) [MPa] |
TS (min) [MPa] |
Hardness [Rockwell] |
| Class 8.8 Bolt |
Under M16 |
580 |
640 |
800 |
|
| 17-72 |
600 |
660 |
830 |
C23–34 |