M2 M8 M12 A2-70 A2-80 A4-70 A4-80 18-8 Stainless Steel Metal Bolt Flat Square Head Bolt GB /T 8
| Name | Metal Bolt |
| Standard | DIN, ASME, ANSI, ISO |
| Material | Stainless steel |
| Place of Origin | China |
| Finish | Polish, Passivation, Black, Galvanization, Chromate, Dacromet |
| Certificate | ISO9001:2008, ROHS |
| Used | Building Industry Machinery |
| Thread Type | Coarse, Fine |
| Usage | Fastening |
| Function | Connection, Fastening and Decoration |
| Strength | High |
| Size | Various sizes available |
| Measurement System | INCH, Metric system |
Square head bolts, alternatively called square head screws , are essential fasteners known for their robustness and versatility. The square shape of the head provides a unique advantage in terms of torque application. It distributes the force evenly, reducing the risk of rounding off during tightening. These bolts are available in a wide range of materials, with stainless steel variants being highly popular due to their durability and resistance to rust. The different size options, from small M2 to larger M16, and the availability of customized pieces, make them adaptable to various projects. In the field of metalworking, construction, and even in some household repairs, square head bolts play a crucial role in holding structures and components together firmly.
- Industrial Machinery Assembly: Used to connect heavy-duty components (e.g., gearboxes, engine blocks) in manufacturing equipment, ensuring stable load distribution during operation.
- Construction Engineering: Secures structural elements like steel beams, columns, and prefabricated panels in buildings, bridges, and infrastructure projects.
- Automotive & Aerospace: Joins critical parts (e.g., chassis frames, engine mounts, aircraft fuselage sections) where high strength and vibration resistance are required.
- Power Generation Equipment: Fixes turbine components, generator casings, and transmission systems in thermal, hydro, or wind power plants.
- Heavy-Duty Furniture & Fixtures: Assembles robust furniture (e.g., industrial workbenches, storage racks) and fixtures (e.g., machine tool bases) needing durable, long-term connections.
| Aluminum | Excellent thermal/electrical conductivity but naturally soft. May produce gelatinous buildup during processing. |
| Titanium | EDM machining recommended. Requires deionized water to control heat during processing. |
| Steel | Very strong metal. Wire cutting machines often preferred for complex features. Requires heat management. |
| Brass | High tensile strength, easy to machine but requires slow cutting speed due to softness. |
- Medium carbon steel construction: Offers balanced strength (typically 4.8–12.9 grade) and toughness, suitable for moderate to high-load applications.
- Reusable & cost-effective: Can be removed and reinstalled multiple times without significant loss of performance, reducing long-term maintenance costs.
- Gasket-free compatibility: Directly interfaces with mating surfaces or nuts, eliminating the need for additional gaskets while maintaining sealing integrity.
- High-strength bolt compatibility: Works seamlessly with Class 8.8 and 10.9 high-strength bolts, enhancing overall joint reliability under dynamic or static loads.
- Durable wholeness: Manufactured with precision threading and surface treatments (e.g., zinc plating, black oxide) for corrosion resistance and extended service life.
A: We are factory and OEM are available.
A: Generally 7-10 days if in stock, or 15-20 days if not in stock (depending on quantity).
A: Yes, we offer free samples but customer pays freight cost.
A: 30% T/T in advance, balance before shipment or L/C.
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