M4 M5 Stainless Steel Hex Socket Head Cap Screw B8 B8M B8T GR660 A286
| Attribute | Value |
|---|---|
| Name | Metal Bolt |
| Standard | DIN, ASME, ANSI, ISO |
| Material | Stainless steel |
| Place of Origin | China |
| Finish | Polish, Passication, black, galvanization |
| Certificate | ISO9001:2008, ROHS |
Cylindrical head hex socket screws, also known as hex socket bolts, cup head screws, and hex socket screws, have different names but represent the same meaning. For the commonly used hex socket cylindrical head screws, there are grades 4.8, 8.8, 10.9 and 12.9. It is also called an Allen screw or an Allen bolt. Its head is an inner hexagonal head and also a cylindrical head.
They are classified by material into stainless steel and iron. The stainless steel ones include:
- Stainless steel SUS202 hex socket cylindrical head screws (common stainless steel)
- Stainless steel SUS304 hex socket cylindrical head screws
- Stainless steel SUS316 hex socket cylindrical head screws
According to the strength grades:
- 4.8 grade hex socket cylindrical head screws
- 8.8 grade hex socket cylindrical head screws
- 10.9 grade hex socket cylindrical head screws
- 12.9 grade hex socket cylindrical head screws
Hex socket cylindrical head screws of grade 8.8-12.9 are called high-strength and high-grade hex socket bolts.
The application range of bolts is extensive, including:
- Electronic products
- Mechanical products
- Digital products
- Power equipment
- Mechanical and electrical machinery products
Bolts are also used in ships, vehicles, hydraulic projects, and chemical experiments. They are used in many applications from miniature bolts for precision equipment to large bolts for construction projects.
| Automotive | In high-strength applications such as automotive engines, heavy-duty machinery, and bridge construction, they are preferred for their larger support area and better anti-loosening performance. |
| Mechanical | Used in mechanical, electronic, automotive, construction and other fields to connect various mechanical parts, circuit boards, engines, transmissions, building structures, etc. |
| Energy | For the energy industry, brackets and fixtures used to connect power generation equipment and transmission lines. |
| Architectural | In construction engineering, shipbuilding, and petrochemical industry, used to connect building structures, improve ship navigation safety and stability, and ensure petrochemical equipment safety. |
| Aluminum | Has excellent thermal and electrical conductivity but is naturally soft. May produce gelatinous buildup after processing and requires proper operation during cutting. |
| Titanium | EDM machining is well suited for titanium as the process can withstand the viscosity of this alloy. Requires deionized water as a medium to help control heat during processing. |
| Steel | A very strong metal that generates significant heat during processing. Many manufacturers use wire cutting machines for complex steel features. |
| Brass | Has high tensile strength and is easy to machine, but requires slow cutting speed due to being a soft metal. |
Ordinary bolt heads are very thick and difficult to deform. If vibration occurs, they may need re-tightening. Flange bolts with thinner parts can slightly deform, allowing for more secure locking.
Flange bolts offer additional advantages:
- Can be used with special tools in confined spaces
- Flange plate provides additional fastening support
- Safer for use with softer, non-wear-resistant materials as they prevent perforation
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