Luke Steel, located in Houston, Houstan, stands out as a premier manufacturer and supplier of Alloy Steel Gr 12.9 Fasteners, specifically designed for high-stress industrial and structural applications. These fasteners are crafted from top-quality alloy steel and go through rigorous quality control processes to ensure they meet global standards for strength, durability, and reliability. With a diverse selection of sizes and finishes, Luke Steel’s Grade 12.9 fasteners are well-regarded for their impressive tensile properties and fatigue resistance. Known for their punctual delivery, precision engineering, and customer-centric service, Luke Steel has become a trusted partner for essential fastening solutions.
Alloy Steel Gr 12.9 Fasteners are produced from medium carbon alloy steel, typically containing carbon (0.35–0.45%), along with manganese, chromium, and molybdenum. These fasteners undergo quenching and tempering to achieve a tensile strength of 1220 MPa and a yield strength of 1100 MPa, along with high hardness levels (39–44 HRC). This specific composition and heat treatment ensure exceptional wear resistance, mechanical stability, and fatigue performance. The alloying elements enhance strength retention under high stress and provide corrosion resistance, making these fasteners perfect for demanding mechanical assemblies.
Standard :Â DIN EN ISO 4014 & 4017 DIN 931 / 933 & IS 1364 / IS 1363
Size :Â Dia M 20 to 100 mm / Inch 3/4″to 3.1/2″
Finish :Â Plain / Zinc plated / Hot dip galvanised
Types :Â Nuts, Bolts, Screws, Sockets, Studs, Screw, Hex Set Screw, Socket Screw, Cap Screw, Pan Head Screw, Socket Head Cap Screw, Washers, Spring Washers, Studs, Anchors
| Grades | Size Range | PS [MPa] | YS (min) [MPa] | TS (min) [MPa] | Hardness [Rockwell] |
| Class 12.9 | Under M16 | 580 | 640 | 800 | |
| 17-72 | 600 | 660 | 830 | C23–34 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Hexagon Bolts / Set Screws | Stud Bolts | Hexagon Nuts | Socket Capscrews |
|---|---|---|---|
DIN 931 | BS4882 | DIN 934 | DIN 912 |
DIN 933 | DIN 976 | BS 1768 | DIN 6912 |
BS 1768 | Â | BS 1769 | DIN 7984 |
UNI 5731 | Â | BS 1083 | ANSI B18.3 |
UNI 5739 | Â | BS 3692 | ISO 4762 |
ISO 4014 | Â | ISO 4032 | UNI 5931 |
ISO 4017 | Â | ISO 4033 | BS 2470 |
BS 1769 | Â | ANSI B18.2.2 | BS 4168 |
BS 3692 | Â | Â | Â |
ANSI B18.2.1 | Â | Â | Â |
Socket & Slotted Set Screws | Socket & Slotted Countersunk Screws | Studs | Washers |
DIN 913 | DIN 963 | DIN 938 | DIN 125 |
DIN 914 | DIN 7991 | DIN 939 | DIN 9021 |
DIN 915 | BS 4168 | DIN 2510 | BS 4320 |
DIN 916 | BS 1981 | BS 4439 | BS 3410 |
DIN 551 | BS 483 | BS 2693 | Â |
DIN 553 | BS 2470 | Â | Spring Washers |
DIN 438 | Â | Â | DIN 127 |
BS 4168 | Â | Â | BS 4464 |
 |  |  | BS 1802 |
Alloy Steel Gr 12.9 Fasteners find extensive use in applications that demand extreme strength and reliability, such as automotive engine systems, heavy construction equipment, aerospace assemblies, wind turbines, and industrial machinery. Their capability to endure high torque, vibration, and dynamic loads makes them ideal for securing moving parts and load-bearing structures. These fasteners are also preferred in tooling setups, die assemblies, and critical joints within high-performance mechanical systems. Their precision, strength, and durability guarantee long-lasting performance in safety-critical and high-load environments across various engineering sectors.
Luke Steel 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 Houstan, USA.
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