Thabiso Steel, located in Cape Town, South Africa, has earned a solid reputation as a reliable manufacturer and supplier of high-performance steel products tailored for demanding industrial applications. Among their impressive lineup, the Alloy Steel 4140 Fasteners truly shine with their remarkable strength, toughness, and precision engineering. Crafted using cutting-edge machining and heat treatment methods, these fasteners meet international standards for performance and reliability. Thabiso Steel’s commitment to quality, innovation, and customer satisfaction guarantees that every product consistently delivers dependable results across a variety of industries.
The Alloy Steel 4140 Fasteners are primarily made up of chromium, molybdenum, and carbon, creating a versatile low-alloy steel known for its outstanding mechanical properties. The addition of chromium boosts hardness and corrosion resistance, while molybdenum enhances strength and toughness. These fasteners showcase high tensile and yield strength, excellent fatigue resistance, and superior wear performance. Thanks to the heat-treated microstructure of the alloy, they offer dimensional stability and durability under stress, making them perfect for applications that involve heavy loads, impact, and fluctuating temperatures.
| Standard | ASTM A193, ASTM A194 / ASME SA193, SA194 GR, IS, BS |
| Specification | IS, BS, ASTM |
| Size | M 02 to M 160 |
| Length | UPTO 5 METERS |
| Grade | B 6, B 7/ B 7M, B 16, 2, 2HM, 2H, GR 6, B 7, B 7M |
| Type | Bolts, nuts, Washers, Anchor Fasteners, Stud Bolts, Eye Bolt, Stud, Threaded Rod, Cotter Pin, Socket Screw, Fine Fasteners & Spares, Foundation Fasteners, etc. |
| Element | AISI 4140 |
| Fe | 96.785 – 97.77 |
| Cr | 0.80 – 1.10 |
| Mn | 0.75 – 1.0 |
| C | 0.380 – 0.430 |
| Si | 0.15 – 0.30 |
| Mo | 0.15 – 0.25 |
| S | 0.040 |
| P | 0.035 |
| Grade AISI 4140 | Metric | Imperial |
| Tensile strength | 655 MPa | 95000 psi |
| Yield strength | 415 MPa | 60200 psi |
| Bulk modulus (Typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson’s ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 25.70% | 25.70% |
| Hardness, Brinell | 197 | 197 |
| Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
| Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
| Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.) | 13 | 13 |
| Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
| Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.) | 65 | 65 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
| Grade AISI 4140 | Metric | Imperial |
| Thermal expansion co-efficient (@ 0-100°C/32-212°F) | 12.2 µm/m°C | 6.78 µin/in°F |
| Thermal conductivity (100°C) | 42.6 W/mK | 296 BTU in/hr.ft².°F |
You’ll find Alloy Steel 4140 Fasteners being utilized across various industries, including automotive, construction, oil and gas, petrochemical, and heavy machinery. They’re particularly well-suited for applications that demand high strength and wear resistance, such as engine components, structural assemblies, pressure vessels, and mechanical equipment. These fasteners are designed to perform reliably in environments that experience high pressure, vibration, and temperature changes. With their exceptional mechanical integrity and corrosion resistance, they’ve become the go-to choice for engineers and manufacturers looking for durable and long-lasting fastening solutions.
ThabisoSteel is a leading manufacturer, supplier and exporter of high-quality Carbon Steel, Alloy Steel, Mild Steel and Galvanized Steel products. Our extensive product range includes Pipes, Tubes, Flanges, Pipe Fittings, Forged Fittings, Sheets and Plates, catering to various industries in Cape Town, South Africa.
Copyright 2025 ThabisoSteel. All rights reserved
