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Pengkumta Fasteners, based in Bangkok, Thailand, stands out as a top-notch manufacturer and supplier of High Tensile Grade 9.8 Bolts, crafted for exceptional strength, durability, and reliability. These bolts are designed to meet international quality standards, making them perfect for applications that demand impressive load-bearing capacity and resistance to dynamic stresses. Thanks to advanced production methods, rigorous quality checks, and prompt delivery, Pengkumta Fasteners offers fastening solutions that industries trust. High Tensile Grade 9.8 Bolts find their place in automotive, construction, engineering, and heavy machinery sectors, ensuring long-lasting performance, mechanical stability, and safety even in high-stress and challenging environments.
These bolts are made from medium carbon steel, enhanced with manganese and boron, and undergo a heat treatment process involving quenching and tempering. This unique composition results in a tensile strength of around 900 MPa and a yield strength of about 720 MPa, providing high fatigue resistance and toughness. With excellent hardness and durability, they ensure reliable fastening under heavy loads and constant vibrations. The Grade 9.8 classification strikes a perfect balance between strength and ductility, making them ideal for demanding industrial and engineering tasks.
| 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 | |||
| Grade 9.8 | Carbon or alloy steel (B, Mn, Cr), quenched and tempered | 0,15 | 0,40 | 0,025 | 0,025 | 0.003 | 425 |
| Markings & Mechanical Prperties | ||||||
|---|---|---|---|---|---|---|
| Grades | Markings | Size Range | PS [MPa] | YS (min) [MPa] | TS (min) [MPa] | Hardness [Rockwell] |
| Class 9.8 |  | 1.6–16 | 650 | 720 | 900 | C27–36 |
| 9.8 Grade Fasteners Sizes | M2-M100 (Cold/ Hot forged) |
| Grade 9.8 Bolt Length | 3 mm to 200 mm |
| Class 9.8 Bolts Size Metric |
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| Grade 9.8 Hex Bolts Size Inch |
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| Standard | Manufacturer of Grade 9.8 Bolt as per IS, ANSI, ASTM, DIN, ISO, JIS, GB, ASME, BS, UNI, CSN, EU, IFI, PN, and all International Standards
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| Grade 9.8 Steel Bolts & Screws US Threads | Unified national fine (UNF), UNJC, UNJF, Unified National Coarse (UNC), Constant-pitch threads, METRIC, BSF, UNR, BSW, Unified national extra fine (UNEF), UNK |
| Grade 9.8 Bolts Head drive | Phillips/Slot, Phillips, Slotted, Six-Lobe, etc |
| Material Origin | Grade 9.8 Bolt are Western European. Eastern origin possible on request. |
| Grade 9.8 Nut Bolt Surface Finish & Coating |
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| BS 3692 grade 9.8 Fasteners types | Hex Domed Cap Nuts, Stud Bolts, Foundation Bolts, Hex Coupling Nut, Pan Head Screw, T-Head Bolts, Eye Bolt, Socket Screw, Bolts, Machine Screw, J Bolts, Washers, Socket Head Cap Screw, Anchors, Marine Anchors, Structural Bolts, Square Nut, Hex Set Screw, Allen Cap screw, Nut, Socket Hexagon Head Screw, U Bolts, Studs, Anchor Bolt, Screw, Spring Washers, Hex Head Bolts, Sockets, Nuts, Wing Screw, Cap Screw, Studs, Hex Nut, Hexagon Nut, Mushroom Head Square Neck Bolts, Wing Screw, Screws |
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 9.8 Bolts are widely utilized in automotive assemblies, such as engines, gearboxes, and suspensions, where strength and reliability are paramount. In construction, they play a crucial role in steel structures, bridges, and infrastructure projects that require robust fastening. These bolts are also essential in heavy machinery, mining equipment, and railways, delivering outstanding performance under stress. Furthermore, they are commonly used in wind energy, defense, and industrial equipment manufacturing, providing dependable fastening solutions where safety, load capacity, and mechanical integrity are vital.
Our grade 9.8 bolts are carefully loaded to prevent damage during transport. We use sturdy wooden boxes or crates that meet international standards. Each bolt is marked with the company logo, grade, size and lot number. We offer EN 10204-3.1 and EN 10204-3.2 certificates, material certificates, NABL-approved laboratory test reports, and professional test certificates. In addition, we provide 100% radiographic and third-party inspection reports to ensure strict quality control and regulatory compliance. This ensures that our bolts meet the highest safety and performance standards.
Pengkumta Fasteners is a leading manufacturer and supplier of high-quality fasteners in Bangkok, Thailand, with over 8 years of experience serving global industries.
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