Home > Class 9.8 Bolt
Grade 9.8 boltsare appropriate for construction uses that demand exceptionally high tensile strength. With a tensile strength of 900 MPa, they deliver the essential structural integrity needed for load-bearing materials. Such bolts are frequently applied in intricate construction and heavy machinery settings. Nevertheless, it is recommended to review construction technology standards and regulations to confirm that Class 9.8 bolts are appropriate for a particular construction use. Doing so guarantees safety and adherence to 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 |
At Koasteel, we take pride in being the largest supplier and manufacturer in the New Zealand, delivering advanced solutions for every one of your piping requirements. With cutting-edge production facilities strategically positioned in the New Zealand, we hold an extensive inventory of more than 25,000 tons of top-quality materials kept ready in stock.
| 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 |
Reach out to us for a fast quote tailored to your requirement.
We supply these Grade 9.8 Bolts conforming to DIN, ISO, JIS or ANSI Standard.
Grade 9.8 bolts serve applications as varied as the industries that use them, led chiefly by the aerospace, railway, construction and automotive industries, along with petrochemical, nuclear, medical, Oil & Gas, Chemical, Pharmaceutical, Food & Beverage, Nuclear, Thermal Power plants, Paper and Pulp, marine and mining, etc.
Grade 9.8 bolts are typically only recommended for direct use when specific attention is given to natural gas applications. Although they offer high tensile strength and durability, whether Grade 9.8 bolts are appropriate for natural gas hinges on aspects like material compatibility, corrosion resistance, and industry standards governing gas applications concerning fittings. Reviewing applicable codes and standards, such as those from ASTM or ISO, is essential to guarantee safety and compliance in natural ventilation systems and complete the work.
Email: sales@koasteel.nz
