High Strength A2-70 A2-80 A4-70 A4-80 18-8 Stainless Steel Metal Bolt Square Neck T Type Bolt
| 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 (square head screws) play a crucial role in structural and heavy - machinery setups. Structurally, they are used in building frameworks, where their robust design ensures the stability and safety of the entire structure. In heavy - machinery assembly, components need to withstand significant loads, and square head bolts, with their secure fastening ability, meet this demand. Material - wise, high - strength carbon steel grades like 4.8, 6.8, 8.8, 10.9, and 12.9 are commonly used, as well as stainless steel variants such as A2 - 70, A2 - 80, A4 - 70, and A4 - 80. These materials provide the necessary strength and, in the case of stainless steel, corrosion resistance. The square - head design enables easy tightening and loosening, even in confined spaces where power tools might not be practical. For instance, in the assembly of large industrial machines, workers can use wrenches to adjust square head bolts quickly, ensuring that all parts are properly aligned and secured. Their availability in sizes like M2, M8, M12, and M16, along with different strength ratings, allows for customization to fit specific load - bearing requirements of various structural and machinery projects.
- 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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