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Punit Fasteners are Grade 5.8 bolts known for their durability and durability. Our bolts are made of premium materials and conform to ASTM, ASME, ISO, DIN, BS, EN, SAE, and Indian standards. Available in ASME, DIN, ISO, BS, UNI, CSN, PN, EU, and IFI specifications, it is designed to ensure quality and efficiency in every application, delivering excellent performance and reliability for various applications in many cases.
Punit Fasteners, a well-known Delhi-based manufacturer and supplier, has expertise in high-performance Grade 5.8 Bolts designed for use in construction, mechanical, and automotive applications. Made of medium carbon steel, these bolts provide a consistent blend of strength, ductility, and durability for safe usage in moderate-strength applications. We at Punit Fasteners maintain international quality standards through stringent testing and certification to ensure that every bolt delivers under demanding conditions. Our Grade 5.8 bolts are designed for reliability, safety, and enduring performance, making us a go-to option for builders, engineers, and industry customers in both domestic and international markets.
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 made of medium carbon steel with a nominal carbon content of around 0.25%–0.55% along with additions of manganese, phosphorus, and sulfur to enhance strength and machinability. These bolts have a minimum tensile strength of 520 MPa and around 420 MPa yield strength, along with excellent ductility and workability. Their reasonable hardness and structural strength qualify them for a variety of fastening purposes. Grade 5.8 bolts meet international mechanical standards, guaranteeing reliable performance under different loads and conditions in structural, automotive, and general engineering applications.
Grade 5.8 bolts find extensive applications in structural frameworks, automotive parts, mechanical assemblies, and heavy machinery, where there is a need for average strength, dependability, and affordability. They are critical for fastening steel beams, joints of bridges, engine components, and machinery frames and provide strong and long-lasting connections. With the ability to comply with international standards, they can be used for mega construction and infrastructure developments. Engineers and fabricators favor these bolts due to their reliable performance, availability in various sizes, and simplicity. Grade 5.8 bolts are a reliable fastening option across industries where structural support of medium strength is necessary.
Punit Fasteners is a leading manufacturer and supplier of high-quality fasteners in Delhi, India, with over 15 years of experience serving global industries.
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