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Mira Fasteners, based in Kuala Lumpur, Malaysia, is a trusted manufacturer and supplier of High Tensile Grade 5.8 Bolts. These products are designed to offer a perfect blend of strength, durability, and cost-effectiveness. Made from high-quality medium-carbon steel, these bolts are precision-engineered to meet international standards, ensuring they perform consistently and provide secure fastening. Renowned for their excellent balance of mechanical strength and flexibility, High Tensile Grade 5.8 Bolts are ideal for a variety of engineering, automotive, and construction projects where reliable yet budget-friendly fastening is crucial.
These bolts are crafted from medium-carbon steel and heat-treated to achieve a tensile strength of about 520 MPa and a yield strength of roughly 420 MPa. This grade provides enhanced strength compared to 4.8 bolts while still offering good ductility, making it a smart choice for medium-duty applications.
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 | |||
5.8 Grade Bolt | Carbon steel | – | 0,55 | 0,050 | 0,060 | Not specified | – |
Head marking | Grade | Material | Proof strength | Yield stress (min.) | Tensile strength (min.) | Core hardness (Rockwell) |
Class 5.8 | Low or medium carbon steel | 380 Mpa | 420 Mpa | 520 Mpa | B82-95 |
| Grade 5.8 Fasteners Grades | DIN 933 Grade 12.9 |
| Grade 5.8 Bolts Standard | ASTM F568, ASME SF568 |
| Grade 5.8 studs Size | Dia 1.6mm to 100 mm Inch 3/4“ to 3.1/2“ |
| Grade 5.8 Fasteners finish | Zinc plated / Plain / Hot dip galvanised |
To satisfy our clients needs by providing high quality products at competitive price as per the schedule and to maintain long term relationship with our clients.
Grade 5.8 bolts are used extensively in applications requiring high tensile strength and reliability. It is commonly used in structural steelwork, heavy machinery and automotive assemblies where strong fastening solutions are required. These bolts are suitable for connecting critical components in bridges, buildings and industrial equipment, providing a balance of strength and power. Adherence to stringent international standards ensures safe performance requirements are met at site types, making it desirable for engineers and manufacturers seeking reliable packaging solutions. There are options available
You’ll find these bolts widely used in machinery assembly, light to medium structural projects, automotive parts, and equipment manufacturing. Their unique combination of strength, reliability, and affordability makes them a go-to fastening solution for industries looking for robust yet cost-effective options.
Mira Fasteners is a leading manufacturer and supplier of high-quality fasteners in Kuala lumpur, Malaysia, with over 8 years of experience serving global industries.
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