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Welcome to GIC Fasteners, where we pride ourselves on crafting top-quality square head bolts that meet rigorous industry standards. As specialists in manufacturing, we ensure that our square head bolts adhere to various specifications including DIN, ASTM, ISO, BS standards, and international equivalents. What sets us apart is our unwavering dedication to excellence, guaranteeing that each bolt is meticulously engineered to offer unmatched performance and reliability across a diverse range of applications. Whether you're in construction, machinery, or other industrial sectors, we have the expertise to meet your specific needs with customized fastening solutions. Trust GIC Fasteners for high-quality square head bolts crafted with precision and backed by our commitment to delivering excellence.
Are you in need of sturdy square head bolts to reinforce your projects? Look no further than GIC Fasteners. Our square head bolts are meticulously crafted to meet stringent quality standards, ensuring they provide robust and reliable fastening solutions for your needs. Whether you’re tackling construction projects, machinery installations, or any other application, our bolts are engineered to deliver outstanding performance and durability.
At GIC Fasteners, we recognize the importance of finding the perfect fit for your requirements. That’s why we offer customized options to ensure you get precisely what you need. Ready to enhance the strength and security of your projects? Reach out to our team at sales@gicfasteners.com today for personalized assistance and competitive pricing. Let GIC Fasteners be your trusted partner in securing your projects with top-quality square head bolts that you can count on.
| Standard | : | DIN, ASTM, BS, ISO, JIS, IS, GB, IS 4190 and all other International Standards |
| Length | : | 3 mm to 200 mm |
| Size | : | M3 – M56 | 3/6″ to 2″ | Custom Sizes |
| Threads: | : | BSF, UNF METRIC, UNC, BSW or as required |
| Finish | : | Plain, black, zinc plated (Cr,3+), zinc plated(Cr,6+), hot dipped galvanized, dacromet, nickel plated, cadmium plated, etc. |
| Forming | : | Hot & Cold Forged |
| Variants | : | Fully Threaded Square Head Bolts, Partial Threaded Square Head Bolts, Metric Square Head Bolts, Imperial Square Head Bolts |
| Coatings | : | PTFE (Teflon), Hot Dip Galvanizing, Aluminum Zinc Flake, Zinc Phosphating, Manganese Phosphating, Metallic Zinc, Nickel Bolts Plating, Chrome Plating, Cadmium Plating, Silver Plating, Tin Plating |
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Nominal or Basic Product Diameter
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Diameter of Full Size Body (B) | Width Across Flats (W) | Width Across Corners (C) | Head Height (H) | Radius of Fillet (R) | Thread Length for Bolt Lengths | |||||||
| Max | Min | Max | Min Sharp | Max | Min | Max | Min | Max | Min (Basic) | 6 in. & Shorter (Basic) | over 6 in. (Basic) | ||
| 1/4 | .2500 | .260 | .237 | .375 | .362 | .530 | .498 | .188 | .156 | 0.03 | 0.01 | .750 | 1.000 |
| 5/16 | .3125 | .324 | .298 | .500 | .484 | .707 | .665 | .220 | .186 | 0.03 | 0.01 | .875 | 1.125 |
| 3/8 | .3750 | .388 | .360 | .562 | .544 | .795 | .747 | .268 | .232 | 0.03 | 0.01 | 1.000 | 1.250 |
| 7/16 | .4375 | .452 | .421 | .625 | .603 | .884 | .828 | .316 | .278 | 0.03 | 0.01 | 1.125 | 1.375 |
| 1/2 | .5000 | .515 | .482 | .750 | .725 | 1.061 | .995 | .348 | .308 | 0.03 | 0.01 | 1.250 | 1.500 |
| 5/8 | .6250 | .642 | .605 | .938 | .906 | 1.326 | 1.244 | .444 | .400 | 0.06 | 0.02 | 1.500 | 1.750 |
| 3/4 | .7500 | .768 | .729 | 1.125 | 1.088 | 1.591 | 1.494 | .524 | .476 | 0.06 | 0.02 | 1.750 | 2.000 |
| 7/8 | .8750 | .895 | .852 | 1.312 | 1.269 | 1.856 | 1.742 | .620 | .568 | 0.06 | 0.02 | 2.000 | 2.250 |
| 1 | 1.0000 | 1.022 | .976 | 1.500 | 1.450 | 2.121 | 1.991 | .684 | .628 | 0.09 | 0.03 | 2.250 | 2.500 |
| 1-1/8 | 1.1250 | 1.149 | 1.098 | 1.688 | 1.631 | 2.386 | 2.239 | .780 | .720 | 0.09 | 0.03 | 2.500 | 2.750 |
| 1-1/4 | 1.2500 | 1.277 | 1.223 | 1.875 | 1.812 | 2.652 | 2.489 | .876 | .812 | 0.09 | 0.03 | 2.750 | 3.000 |
| 1-3/8 | 1.3750 | 1.404 | 1.345 | 2.062 | 1.994 | 2.917 | 2.738 | .940 | .872 | 0.09 | 0.03 | 3.000 | 3.250 |
| 1-1/2 | 1.5000 | 1.531 | 1.470 | 2.250 | 2.175 | 3.182 | 2.986 | 1.036 | .964 | 0.09 | 0.03 | 3.250 | 3.500 |
| Nominal Bolt Diameter | Up to 1 in., incl. |
Over 1 in. to 2-1/2 in., incl. | Over 2-1/2 in. to 4 in., incl. | Over 4 in. to 6 in., incl. | Longer than 6 in. | |||||
| 1/4 - 3/8 | +0.02 | -0.03 | +0.02 | -0.04 | +0.04 | -0.06 | +0.06 | -0.10 | +0.10 | -0.18 |
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7/16 & 1/2 |
+0.02 | -0.03 | +0.04 | -0.06 | +0.06 | -0.08 | +0.08 | -0.10 | +0.12 | -0.18 |
| 9/16 - 3/4 | +0.02 | -0.03 | +0.06 | -0.08 | +0.08 | -0.10 | +0.10 | -0.10 | +0.14 | -0.18 |
| 7/8 - 1 | +0.08 | -0.10 | +0.10 | -0.14 | +0.12 | -0.16 | +0.16 | -0.20 | ||
| 1-1/8 - 1-/12 | +0.12 | -0.12 | +0.16 | -0.16 | +0.18 | -0.18 | +0.22 | -0.22 | ||
| Hardness |
Bolts of a length less than 3 times diameter: Rockwell B69-100 |
| Tensile Strength |
60,000 psi. minimum |
| Elongation in 2 in. | 18% minimum |
Square head bolts, renowned for their distinctive appearance and reliable performance, find diverse applications across various industries. These versatile fasteners are designed to provide secure and sturdy connections. Here are some key applications of square head bolts:
1. Construction: Square head bolts are frequently used in construction projects, particularly in timber framing and heavy wooden structures. Their unique appearance adds an aesthetic touch while ensuring structural stability.
2. Machinery and Equipment: Square head bolts play a vital role in securing heavy machinery components, including engines, conveyor systems, and manufacturing equipment, where torque and stability are essential.
3. Marine and Shipbuilding: In maritime and shipbuilding applications, square head bolts are used to fasten wooden and metal components in boat and ship construction, offering durability and a distinctive look.
4. Automotive Restoration: Enthusiasts and professionals involved in automotive restoration projects often utilize square head bolts for their vintage and classic car restorations due to their traditional appearance and reliable performance.
5. Timber Structures: Square head bolts are the preferred choice for joining timber beams and posts in timber frame construction, ensuring a robust and visually appealing connection.
6. Agricultural Machinery: In the agricultural sector, square head bolts secure critical components of farming equipment, such as plows and combines, where durability and ease of maintenance are crucial.
7. Decorative Hardware: Square head bolts are also used in decorative applications, including furniture assembly and architectural details, where they provide both functionality and an attractive design element.
8. Custom Fabrications: Many artisans and craftsmen incorporate square head bolts into custom metal and woodwork projects to achieve a unique and rustic appearance.
9. Restoration of Historical Buildings: Square head bolts are often chosen for restoration work on historical buildings to maintain authenticity while ensuring structural integrity.
These versatile fasteners are favored for their distinctive appearance and reliable performance, making them a valuable choice across a wide spectrum of applications.
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Square head bolts are fasteners with a square-shaped head, offering a distinctive appearance. They are known for their excellent torque transmission and are often used for aesthetic and structural purposes, particularly in timber construction and vintage restorations.
Square head bolts can be suitable for outdoor use, depending on the material and coatings chosen. Stainless steel square head bolts, for example, offer excellent corrosion resistance, making them ideal for outdoor and marine applications.
Square head bolts and hex head bolts serve similar functions but have different appearances. While they can often be used interchangeably, the choice may depend on the desired aesthetics and the specific requirements of your project.
Yes, square head bolts are available in various materials, including carbon steel, stainless steel, and alloy steel. The choice of material depends on factors such as load, corrosion resistance, and environmental conditions.
Square head bolts find applications in construction, shipbuilding, automotive restoration, agriculture, and decorative hardware, among others. They are versatile fasteners appreciated for both functionality and aesthetics.
Yes, many manufacturers offer customization options for square head bolts, including different lengths, threads, and finishes, allowing you to tailor the fasteners to your specific project needs.
While there are no specific standards exclusively for square head bolts, they often conform to general fastener standards like DIN, ASTM, ISO, or BS, ensuring quality and compatibility with industry norms.
Square head bolts are a popular choice for historical building restorations due to their traditional appearance. They provide both structural integrity and an authentic aesthetic, making them well-suited for such projects.
Regular inspection for corrosion and proper torque is essential for square head bolts used outdoors. Applying appropriate coatings and lubricants can help enhance their longevity and performance in outdoor environments.
