Home > Grade 8.8 Bolt
Grade 8.8 Boltare appropriate for construction uses that demand high tensile strength. With a tensile strength of 800 MPa, they deliver the essential structural integrity needed for load-bearing materials. These bolts are frequently applied in demanding tasks like construction and the automotive sector. That said, it is wise to review construction engineering standards and regulations to confirm that Grade 8.8 bolts fit particular construction uses. Doing so guarantees safety and adherence to regulatory and industry standards.
| Washer Grade | Material and heat treatment | Chemical composition (analysis on the product) % | °C Min hardening temperature | ||||
| C | P | S | B | ||||
| minimum | max | max | max | max | |||
| 8.8 | Alloy/ Carbon steel (B, Mn, Cr), quenched and tempered | 0,15(3) | 0,40 | 0,025 | 0,025 | 0,003 | 425 |
| Quenched and tempered carbon steel washer | 0,25 | 0,55 | 0,025 | 0,025 | |||
| Quenched and tempered alloy steel washer | 0,20 | 0,55 | 0,025 | 0,025 | |||
| Grades | Size Range | PS [MPa] | YS (min) [MPa] | TS (min) [MPa] | Hardness [Rockwell] |
|---|---|---|---|---|---|
| Class 8.8 | Under M16 | 580 | 640 | 800 | |
| 17-72 | 600 | 660 | 830 | C23–34 |
At Koasteel, we take pride in being the largest supplier and manufacturer in the New Zealand, delivering innovative solutions for every one of your piping requirements. With advanced production facilities strategically situated in the New Zealand, we maintain an extensive inventory of more than 25,000 tons of top-quality materials kept ready in stock.
| Bolt Dia | Body Dia | Head Dia(F) | Head Height (H) | Degree of Slope | |||
|---|---|---|---|---|---|---|---|
| (D) | Max | Max Edge Sharp | Min Edge Sharp | Absolute Min Rounded | Max | Min | |
| 1/2 | 0.515 | 0.935 | 0.905 | 0.845 | 0.269 | 0.233 | 78° to 82° |
| 5/8 | 0.642 | 1.169 | 1.132 | 1.066 | 0.336 | 0.292 | 78° to 82° |
| 3/4 | 0.768 | 1.402 | 1.357 | 1.285 | 0.403 | 0.349 | 78° to 82° |
| 7/8 | 0.895 | 1.637 | 1.584 | 1.511 | 0.47 | 0.408 | 78° to 82° |
| 1 | 1.022 | 1.869 | 1.81 | 1.735 | 0.537 | 0.466 | 78° to 82° |
| 1-1/8 | 1.149 | 2.104 | 2.037 | 1.962 | 0.604 | 0.525 | 78° to 82° |
| 1-1/4 | 1.277 | 2.337 | 2.262 | 2.187 | 0.671 | 0.582 | 78° to 82° |
| 1-3/8 | 1.404 | 2.571 | 2.489 | 2.414 | 0.738 | 0.641 | 78° to 82° |
| 1-1/2 | 1.531 | 2.804 | 2.715 | 2.64 | 0.805 | 0.698 | 78° to 82° |
| Dimensions per ASME B18.5 1990 (R 1998) | |||||||
Reach out to us for a fast quote on your requirement.
We supply these Grade 8.8 Bolts conforming to DIN, ISO, JIS or ANSI Standard.
| ASTM Standards | DIN ISO EN 4017 & 4014 DIN 933 / 931 & IS 1363 / 1363 |
| Size | Diameter 20 to 100 Milimeter / Inch 3/4 to 3.1/2 |
| Surface Finish | Zinc plated / Plain / Hot dip galvanised |
Grade 8.8 bolts serve applications as varied as the industries they support, 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.
Yes, 8.8 grade bolts can be drawn to magnets. Such bolts are typically manufactured from medium carbon steel, which includes iron, a ferromagnetic material. Iron bars draw grade 8.8 bolts toward magnets. That said, the exact magnetic characteristics can differ based on the particular alloy and the temperature of each process applied. For most practical situations, you can anticipate that Category 8.8 bolts will show magnetic attraction, making them well-suited for applications where magnetic properties matter.
Email: sales@koasteel.nz
