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At Hazlewood Fasteners, we manufacture and supply premium-quality Square Bolts in Canberra, Australia, designed for strength, stability, and durability in demanding industrial and construction environments. With a unique four-sided head design, these bolts provide better grip and easier tightening with traditional tools. Our Square Bolts are crafted from high-grade materials and engineered with precision to ensure long-lasting performance, even under heavy loads and harsh conditions. Trusted by builders, engineers, and manufacturers alike, Hazlewood Fasteners’ Square Bolts stand for unmatched reliability, consistency, and quality in every fastening application.
Square Bolts are commonly made from carbon steel, stainless steel, or alloy steel, depending on application requirements. They feature a tensile strength ranging between 400–800 MPa, ensuring durability and resistance to wear, impact, and corrosion. The square-shaped head provides a larger bearing surface for uniform load distribution, reducing the chances of slippage during installation. These bolts can also be zinc-plated, galvanized, or coated for extra corrosion protection—making them suitable for indoor and outdoor use in both mechanical and structural 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 construction, woodworking, industrial machinery, and agricultural equipment where a strong, non-slip fastening is essential. Their square heads provide a traditional yet effective design for timber joints, metal frameworks, and heavy-duty structures. They are also popular in railway systems, bridge assemblies, and automotive applications, where high torque and stability are required. In furniture manufacturing and restoration projects, square bolts add both strength and a classic aesthetic appeal. With Hazlewood Fasteners, every square bolt is engineered for precision, reliability, and performance that stands the test of time.
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.
Hazlewood Fasteners is a leading manufacturer and supplier of high-quality fasteners in Canberra, Australia, with over 8 years of experience serving global industries.
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