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Mazin Fasteners is a reliable manufacturer and supplier of High Tensile Grade 5.8 Bolts, proudly based in Muscat, Oman. We cater to the fastening needs of general engineering, construction, and industrial sectors. Our focus is on precision manufacturing, rigorous quality control, and adherence to international standards like ISO and DIN. With state-of-the-art production facilities and a skilled technical team, we ensure that our Grade 5.8 bolts feature accurate threading, consistent quality, and dependable performance. Our dedication to material traceability, competitive pricing, and timely delivery makes us a trusted partner for infrastructure, fabrication, and mechanical assembly projects.
High Tensile Grade 5.8 Bolts are crafted from low to medium carbon steel and are typically provided in a normalized or lightly heat-treated state. They boast a minimum tensile strength of around 500 MPa and a yield strength of about 0.8 times that tensile value. These bolts are known for their good ductility, moderate hardness, and reliable load-bearing capacity. Their mechanical properties guarantee stable clamping force, resistance to shear loads, and consistent performance in non-critical structural and industrial 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.
High Tensile Grade 5.8 Bolts find their place in a variety of applications that require moderate strength and cost-effective fastening solutions. You’ll often see them in light structural steelwork, machinery assembly, fabrication tasks, pipe supports, brackets, and general construction frameworks. They are widely utilized in workshops, infrastructure projects, agricultural equipment, and industrial installations where extreme loads aren’t a concern. With their ease of installation, good toughness, and reliable performance, Grade 5.8 bolts are perfect for general-purpose and medium-duty fastening needs across various industries.
Our Grade 5.8 bolts are carefully packed to prevent wear and tear during transport. They are packed in standard export packaging, sturdy wooden boxes or boxes that meet international standards. Each bolt is clearly marked with the trademark (company LOGO), grade, size and lot number. We offer EN 10204-3.1, EN 10204-3.2, raw material certificates, NABL-approved laboratory test reports, and professional test certificates for 100%. Radiography test reports and third-party inspection reports are used to ensure quality control and compliance.
Mazin Fasteners is a leading manufacturer and supplier of high-quality fasteners in Muscat, OMAN, with over 8 years of experience serving global industries.
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