Home > Grade 9.8 Bolt
Grade 9.8 bolts are suitable for construction applications requiring very high tensile strength. Their 900 MPa tensile strength provides the critical structural integrity required for load-bearing materials. These bolts are commonly used in complex construction and heavy machinery applications. However, it is advisable to check construction technology standards and regulations to ensure Class 9.8 bolts suit a specific construction application. This ensures safety and complies with regulatory industry standards.
Strength class | Material and heat treatment | Chemical composition (analysis on the product) % | Minimum hardening temperature °C | ||||
---|---|---|---|---|---|---|---|
C | P | S | B | ||||
min | max | max | max | max | |||
Grade 9.8 | Carbon or alloy steel (B, Mn, Cr), quenched and tempered | 0,15 | 0,40 | 0,025 | 0,025 | 0.003 | 425 |
Markings & Mechanical Prperties | ||||||
---|---|---|---|---|---|---|
Grades | Markings | Size Range | PS [MPa] | YS (min) [MPa] | TS (min) [MPa] | Hardness [Rockwell] |
Class 9.8 | ![]() | 1.6–16 | 650 | 720 | 900 | C27–36 |
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9.8 Grade Heavy Hex Bolt Diameter | D | F | C | H | |||||
Body Diameter | Width Across Flats | Width Across Corners | Height | ||||||
Max | Basic | Max | Min | Max | Min | Basic | Max | Min | |
1/2 | 0.515 | 7/8 | 0.875 | 0.850 | 1.010 | 0.969 | 11/32 | 0.364 | 0.302 |
5/8 | 0.642 | 1-1/16 | 1.062 | 1.031 | 1.227 | 1.175 | 27/64 | 0.444 | 0.378 |
3/4 | 0.768 | 1-1/4 | 1.250 | 1.212 | 1.443 | 1.383 | 1/2 | 0.524 | 0.455 |
7/8 | 0.895 | 1-7/16 | 1.438 | 1.394 | 1.660 | 1.589 | 37/64 | 0.604 | 0.531 |
1 | 1.022 | 1-5/8 | 1.625 | 1.575 | 1.876 | 1.796 | 43/64 | 0.700 | 0.591 |
1-1/8 | 1.149 | 1-13/16 | 1.812 | 1.756 | 2.093 | 2.002 | 3/4 | 0.780 | 0.658 |
1-1/4 | 1.277 | 2 | 2.00 | 1.938 | 2.309 | 2.209 | 27/32 | 0.876 | 0.749 |
1-3/8 | 1.404 | 2-3/16 | 2.188 | 2.119 | 2.526 | 2.416 | 29/32 | 0.940 | 0.810 |
1-1/2 | 1.531 | 2-3/8 | 2.375 | 2.300 | 2.742 | 2.622 | 1 | 1.036 | 0.902 |
1-3/4 | 1.785 | 2-3/4 | 2.750 | 2.662 | 3.175 | 3.035 | 1-5/32 | 1.196 | 1.054 |
2 | 2.039 | 3-1/8 | 3.125 | 3.025 | 3.608 | 3.449 | 1-11/32 | 1.388 | 1.175 |
2-1/4 | 2.305 | 3-1/2 | 3.500 | 3.388 | 4.041 | 3.862 | 1-1/2 | 1.548 | 1.327 |
2-1/2 | 2.559 | 3-7/8 | 3.875 | 3.750 | 4.474 | 4.275 | 1-21/32 | 1.708 | 1.479 |
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We offer These Grade 9.8 Bolt as per DIN, ISO, JIS or ANSI Standard.
Grade 9.8 bolts applications are as diverse as the industries they serve driven primarily by the aerospace, railway, construction and automotive industries with petrochemical, nuclear, medical, Oil & Gas, Chemical, Pharmaceutical, Food & Beverage, Nuclear, Thermal Power plants, Paper and Pulp, marine and mining, etc.
Generally, grade 9.8 bolts are only indicated for direct use with specific consideration of natural gas applications. While providing high tensile strength and durability, the suitability of Grade 9.8 bolts for natural gas depends on factors such as material compatibility, corrosion resistance, and industry standards for gas applications about fittings. Consultation of relevant codes and standards, such as from ASTM or ISO, is necessary to ensure safety and compliance in natural ventilation systems and carry out the work.
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