ASTM A568 Specification
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ASTM F568 is standard Specification for metric size bolts, screws and studs that are used in general engineering applications. It is officially titled: Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners. It defines mechanical properties for fasteners that range from M1.6 to 100 in diameter
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Grades Material Description
| Grade 4.6 | Low or medium carbon steel |
| Grade 4.8 | Low or medium carbon steel; fully or partially annealed |
| Grade 5.8 | Low or medium carbon steel; Cold worked |
| Grade 8.8 | Medium Carbon Boron Steel ; Quenched & Tempered |
| Low carbon Grade 8.8 | Low Carbon Boron Steel ; Quenched & Tempered |
| Grade 8.8.3 | Atmospheric corrosion resistant steel ; Quench and Tempered |
| Grade 9.8 | Medium Carbon Boron Steel ; Quenched & Tempered |
| Low carbon Grade 9.8 | Low Carbon Boron Steel ; Quenched & Tempered |
| Grade 10.9 | Quenched & Tempered ; Alloy Steel |
| Low Carbon Grade 10.9 | Low Carbon Boron Steel ; Quenched & Tempered |
| Grade 10.9.3 | Atmospheric corrosion resistant steel ; Quench and Tempered |
| Grade 12.9 | Quenched & Tempered ; Alloy Steel |
Markings & Mechanical Prperties
| Markings & Mechanical Prperties | ||||||
|---|---|---|---|---|---|---|
| Grades | Markings | Size Range | PS [MPa] | YS (min) [MPa] | TS (min) [MPa] | Hardness [Rockwell] |
| Class 4.6 |  |
5–100 | 225 | 240 | 400 | B67–95 |
| Class 4.8 |  |
1.6–16 | 310 | 340 | 420 | B71–95 |
| Class 5.8 |  |
5–24 | 380 | 420 | 520 | B82–95 |
| Class 8.8 |  |
0.050% | 600 | 660 | 830 | C23–34 |
| Low carbon Class 8.8 | |
17–72 | 600 | 660 | 830 | C23–34 |
| Class 8.8.3 |  |
17–72 | 600 | 660 | 830 | C23–34 |
| Class 9.8 |  |
1.6–16 | 650 | 720 | 900 | C27–36 |
| Low carbon Class 9.8 | |
1.6–16 | 650 | 720 | 900 | C27–36 |
| Class 10.9 |  |
5–100 | 830 | 940 | 1040 | C33–39 |
| Low Carbon Class 10.9 | |
5–100 | 830 | 940 | 1040 | C33–39 |
| Class 10.9.3 |  |
5–100 | 830 | 940 | 1040 | C33–39 |
| Class 12.9 |  |
1.6–100 | 970 | 1100 | 1220 | C38–44 |
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