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Lina Fasteners, based in Tunis, Tunisia, is a trusted manufacturer and supplier of high-quality Square Bolts designed for strong and secure fastening in a wide range of industrial applications. With modern manufacturing facilities and strict quality control, the company produces square bolts that meet international standards and precise customer requirements. Square Bolts from Lina Fasteners offer excellent load-bearing capacity, reliable grip, and resistance to loosening, making them suitable for structural and mechanical assemblies. By combining technical expertise with customer-focused service, Lina Fasteners supports construction, engineering, industrial machinery, and fabrication sectors with durable and dependable fastening solutions.
Square Bolts are manufactured from various materials such as carbon steel, stainless steel, and alloy steel, depending on application requirements. These bolts provide good tensile and yield strength, high shear resistance, and dependable load-bearing performance. Mechanically, square bolts offer excellent resistance to rotation due to their square head design, which ensures a secure hold in slots and timber. They maintain structural stability under mechanical stress and vibration, making them suitable for both static and dynamic applications.
| Specification | ||
|---|---|---|
| Material | Standards | Grades |
| Nickel Alloy | ASTM / ASME SB 160 / 164 / 425 / 166 / 446 / 574 / 472 | UNS 2200 (NICKEL 200) / UNS 2201 (NICKEL 201), UNS 4400 (MONEL 400), UNS 8825 (INCONEL 825), UNS 6600 (INCONEL 600) / UNS 6601 (INCONEL 601), UNS 6625 (INCONEL 625), UNS 10276 (HASTELLOY C 276), UNS 8020 (ALLOY 20 / 20 CB 3) |
| Stainless Steel | ASTM / ASME A/SA 193 / 194 | B 8 (304), B 8C (SS 347), B 8M (SS 316), B 8 T (SS 321), A 2, A 4 |
| Alloy Steel | ASTM / ASME A/SA 193 / 194 GR | B 6, B 7/ B 7M, B 16, 2, 2HM, 2H, GR 6, B 7, B 7M |
| Duplex Steel | UNS NO. S 31803, S 32205 | Range: M10 TO M100, LENGTH UPTO 5 METERS |
| Nonmetallic Materials: | Acrylic, Kel-F, Lexan, Polypropylene, Poly Vinyl Chloride, Teflon, Zytel 31, 101, 105 | |
| High-Temp Alloys | Discaloy, 19-9 DL, 16-25-6, A286, Titanium, Nimonic 80, Mulitmet, Haynes 25, Greek Ascalloy, Unitemp 252, Udimet 500, Rene 41, Inco 700, Inco 901, Hastelloy X, 235, Waspaloy, RA 330 | |
| Copper Base Alloys | Copper, Brasses: Yellow, Free-cut, Red, Naval, Bronze: Commercial, Phosphor, Silicon A & B, Aluminum, Silicon-Aluminum, Manganese, Ampco Alloys, Munitz Metal, Cupro-Nicles | |
| Aluminum Alloys: | 1100, 2011, 2014, 2017, 2024, 3003, 5052, 6053, 6061, 7075 | |
| Of Bolts | (C) | (D) | (F) | (H) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Width Corners Across \ | Diameter Of Body | Width Flats Across | Height Table | ||||||
| Maximum | Minimum | Maximum | Basic | Maximum | Minimum | Basic | Maximum | Minimum | |
| 1⁄2 | 1.0061 | 0.0995 | 0.0515 | 3⁄4 | 0.0750 | 0.0725 | 21⁄64 | 0.0348 | 0.0308 |
| 5⁄8 | 1.0326 | 1.0244 | 0.0642 | 15⁄16 | 0.0938 | 0.0906 | 27⁄64 | 0.0444 | 0.0400 |
| 3⁄4 | 1.0591 | 1.0494 | 0.0768 | 11⁄8 | 1.0125 | 1.0088 | 1⁄2 | 0.0524 | 0.0476 |
| 7⁄8 | 1.0856 | 1.0742 | 0.0895 | 15⁄16 | 1.0312 | 1.0269 | 19⁄32 | 0.0620 | 0.0568 |
| 1 | 2.0121 | 1.0991 | 1.0022 | 11⁄2 | 1.0500 | 1.0450 | 21⁄32 | 0.0684 | 0.0628 |
| 11⁄8 | 2.0386 | 2.0239 | 1.0149 | 111⁄16 | 1.0688 | 1.0631 | 3⁄4 | 0.0780 | 0.0720 |
| 11⁄4 | 2.0652 | 2.0489 | 1.0277 | 17⁄8 | 1.0875 | 1.0812 | 27⁄32 | 0.0876 | 0.0812 |
| 13⁄8 | 2.0917 | 2.0738 | 1.0404 | 21⁄16 | 2.0062 | 1.0994 | 29⁄32 | 0.0940 | 0.0872 |
| 11⁄2 | 3.0182 | 2.0986 | 1.0531 | 21⁄4 | 2.0250 | 2.0175 | 1 | 1.0036 | 0.0964 |
| 13⁄4* | 29⁄16 | 13⁄16 | |||||||
| 2* | 215⁄16 | 15⁄16 | |||||||
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.
Square Bolts are widely used in applications where strong fastening and resistance to rotation are essential. They are commonly applied in construction projects, wooden structures, and steel frameworks where the square head provides a firm grip. In industrial machinery and mechanical assemblies, square bolts are used to secure components that experience vibration or heavy loads. Square Bolts are also suitable for agricultural equipment, railways, and fabrication work. Their simple design, strength, and reliable performance make them a preferred choice for structural, industrial, and heavy-duty fastening applications.
We prioritize customer satisfaction and ensure a seamless experience by providing complete documentation alongside our premium square bolts. Our package includes the required documentation, such as a marketing invoice, package list, fumigation certificate, heat treatment protocol, quality assurance plan, and NABL-approved laboratory test report. In addition, we issue a range of test certificates for our square bolts, including MTC according to EN 10204/3.1b, PMI test certificate, 100% radiography test report and third-party inspection certificate.
Lina Fasteners is a leading manufacturer and supplier of high-quality fasteners in Tunis, Tunisia, with over 8 years of experience serving global industries.
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