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Punit Fasteners, a prominent manufacturer and supplier based in Delhi, India, is dedicated to crafting top-notch High Tensile Grade 8.8 bolts tailored for industrial and structural uses. Renowned for their strength, durability, and precision, these bolts are designed to comply with global standards for high-performance fastening solutions. Punit Fasteners places a strong emphasis on thorough quality checks, cutting-edge manufacturing techniques, and prompt delivery, serving industries like construction, automotive, heavy machinery, and infrastructure. With a commitment to reliability and mechanical excellence, the company offers Grade 8.8 bolts that deliver exceptional fastening strength even under intense load and pressure.
High Tensile Grade 8.8 bolts are crafted from medium carbon steel, often enhanced with elements such as manganese or boron, and are typically subjected to quenching and tempering processes. These bolts boast a minimum tensile strength of 800 MPa and a yield strength of 640 MPa. Celebrated for their impressive strength-to-weight ratio, they ensure dependable performance under both dynamic and static loads. The surface is commonly treated (like zinc-plating or black oxide) to boost corrosion resistance. Their mechanical properties make them perfect for high-load applications that demand durability, stability, and resistance to shear and tensile stress.
| Bolts 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 Bolts | 0,25 | 0,55 | 0,025 | 0,025 | |||
| Quenched and tempered alloy steel Bolts | |||||||
| 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 |
| Grade 8.8 Bolts Grades | Grade 8.8 |
| En 15048 Grade 8.8 Size | Dia M 20 to 100 mm Inch 3/4“ to 3.1/2“ |
| 8.8 High Tensile Bolts Standard | ASTM A324, ASME SA324 |
| Grade 8.8 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 8.8 bolts find extensive use in scenarios that require robust fastening under significant loads and dynamic stress. In the construction sector, they are integral to steel structures, bridges, and pre-engineered buildings. The automotive industry utilizes them in engine assemblies, suspensions, and chassis connections. In industrial machinery, these bolts are crucial for securing load-bearing components and rotating equipment. They also play a vital role in railway infrastructure, power plants, and mining equipment. Their high strength, durability, and resistance to deformation make them the go-to choice for safety-critical, high-load applications across various industries.
Our grade 8.8 bolts are carefully loaded to prevent damage during transport. Wooden boxes or sturdy boxes that meet international standards are used. Each bolt is marked with the trademark, grade, size and lot number. We offer EN 10204-3.1 and EN 10204-3.2 certificates, product certificates, NABL-approved laboratory test reports, and professional test certificates. In addition, 100% of radiographic and third-party inspection reports are provided to ensure quality control and compliance.
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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