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At Hazlewood Fasteners in Canberra, Australia, our high-tensile Grade 8.8 bolts are built for demanding projects where strength is not optional — it’s the foundation. Formulated for heavy structural loads, machinery engineering, transport systems, and industrial build-outs, these bolts deliver commanding clamping force and unwavering mechanical endurance. Their high-grade steel core resists shock, shear, vibration, and fatigue, ensuring structural stability even under relentless operational pressure. When performance thresholds rise and weak hardware becomes a liability, Hazlewood’s Grade 8.8 bolts step in — engineered to deliver power, precision, and long-term fastening authority in critical environments.
Grade 8.8 bolts are produced from alloy steel or medium-carbon steel that is quenched and tempered to achieve elite strength and resilience. With minimum tensile strength around 800 MPa and a yield ratio of 80%, they offer outstanding fatigue resistance, stable torque retention, and superior load-bearing reliability. Their hardened structure stands firm against mechanical shock, flexural strain, and dynamic workplace stresses. Designed to support high-duty performance, Grade 8.8 bolts provide exceptional mechanical security and steadfast durability in rigorous industrial and structural environments.
| 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 are indispensable across heavy construction, automotive engineering, mining equipment, structural steel fabrication, transportation assemblies, machinery manufacturing, and pressure-bearing installations. They anchor beams, secure machine components, reinforce frames, fasten axle assemblies, and strengthen load-bearing industrial structures. Ideal for high-stress joints, vibration-prone systems, and areas where safety margins must stay uncompromised, they ensure steadfast performance in both static and dynamic conditions. When your operations demand a fastening solution that can shoulder serious weight and endure punishing conditions, Grade 8.8 bolts deliver unshakeable strength and proven industrial dependability.
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.
Hazlewood Fasteners is a leading manufacturer and supplier of high-quality fasteners in Canberra, Australia, with over 8 years of experience serving global industries.
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