Marzouk Steel, headquartered in Tunis, Tunisia, is a leading manufacturer and supplier of high-quality steel products, serving industries that require strength, precision, and reliability. Among its specialized offerings are Alloy Steel GR 8.8 Fasteners, designed for high-strength, high-performance, and critical mechanical applications. Manufactured using advanced technology and stringent quality control, GR 8.8 fasteners provide excellent tensile strength, toughness, and durability. Marzouk Steel ensures that every GR 8.8 fastener meets international standards, offering engineers and fabricators dependable fastening solutions for automotive, heavy machinery, construction, and industrial systems requiring secure, long-lasting connections.
Alloy Steel GR 8.8 Fasteners are made from high-grade alloy steel with precise heat treatment, engineered for superior tensile strength, hardness, and fatigue resistance. The chemical composition, including carbon, chromium, and molybdenum, enhances toughness, impact resistance, and wear resistance. GR 8.8 fasteners provide excellent mechanical properties, including high yield strength and tensile strength, making them suitable for critical applications requiring secure fastening under moderate to high stress. With consistent performance and long-term reliability, these fasteners ensure safety and durability in demanding industrial and mechanical environments.
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
| Alloy Steel 8.8 | C | Mn | P | S | Si | Ni | Cr |
| 0.15 max | 1.00 max | 0.040 | 0.030 | 1.00 max | – | 11.50-13.50 |
| Grades | Size Range | PS [MPa] | YS (min) [MPa] | TS (min) [MPa] | Hardness [Rockwell] |
| Class 8.8 | Under M16 | 580 | 640 | 800 | Â |
| 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 8.8 Fasteners are widely used in industries that require high-strength, reliable, and durable fastening solutions. They are commonly applied in automotive components, construction equipment, machinery assemblies, industrial tools, and structural connections. Designed to withstand heavy loads, vibration, and cyclic stress, GR 8.8 fasteners maintain structural integrity and provide secure, long-lasting connections. Engineers and fabricators rely on these fasteners for applications where durability, safety, and operational efficiency are essential. Their combination of toughness, hardness, and tensile strength ensures dependable performance in demanding mechanical and industrial environments.
Marzouk 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 Tunis, Tunisia.
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