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High-Quality Hexagon Socket Head Cap Bolt DIN 912 from China Suppliers - Factory Direct Pricing and Fast Shipping
| Product name | Hexagonal socket screw |
| Size | M6 / M8 / M10 / M12 |
| Grade | 4.8 / 8.8 / 10.9 / 12.9 |
| Material | Steel / Stainless Steel |
| Surface treatment | YZP |
| Standard | DIN / ISO |
| Certificate | ISO 9001 |
| Sample | Free Samples |
Definition and Structural Characteristics
An internal hexagonal screw is a fastener with a hexagonal groove (internal hexagonal hole) on the head, which requires the use of an Allen Key or a hexagonal screwdriver head matched with an electric tool for installation and removal.
Structural Features
- Head types: Common cylindrical heads (such as ISO 4762 / DIN 912), countersunk heads (such as DIN 7991), flat heads, etc., suitable for different installation requirements (such as countersunk heads used in scenarios where flush surfaces are required).
- Thread type: Full thread or half thread, with various materials and surface treatments.
Materials and Surface Treatment
Common Materials
- Carbon steel (e.g. Grade 8.8, 12.9): High strength, used in machinery and automobiles.
- Stainless steel (304 / 316): Corrosion-resistant, suitable for outdoor and medical equipment.
- Titanium alloy: Lightweight, high corrosion resistance, used in aerospace.
Application Scenarios
- Industrial field: Machine tools, molds, automation equipment (high-strength connections that require frequent disassembly).
- Automotive / Aviation: Engine components, chassis (high temperature resistance, vibration resistance).
- Consumer electronics: Laptops, cameras (precision small-sized screws, such as M1.6).
- Furniture / Bicycle: IKEA furniture assembly, bicycle brake system (countersunk anti-scratch).
Usage Tips
- The wrench should be fully inserted into the bottom of the hole to avoid sliding teeth caused by oblique force.
- When pre-drilling, countersunk screws need to match the taper (such as 90°).
- Regularly check the torque (using a torque wrench) to prevent over-tightening or loosening.
Frequently Asked Questions
Q What is the difference between a hexagonal socket screw and a regular screw?
A Hexagonal socket screws feature an internal hex drive recess on the head, requiring an Allen key for installation. This design allows for higher torque application and a flush or recessed installation, unlike standard Phillips or slotted screws which use external drive heads.
Q What grades are available and what do they mean?
A Hexagonal socket screws are available in grades 4.8, 8.8, 10.9, and 12.9. These grades indicate the tensile strength and yield strength of the screw. Grade 12.9 is the strongest, commonly used in high-stress applications such as automotive engines and heavy machinery.
Q Which material should I choose — carbon steel or stainless steel?
A Choose carbon steel (Grade 8.8 or 12.9) for high-strength industrial and automotive applications. Opt for stainless steel (304 or 316) when corrosion resistance is required, such as in outdoor environments, marine applications, or medical equipment.
Q What does YZP surface treatment mean?
A YZP stands for Yellow Zinc Plating, a surface treatment that provides a thin zinc coating to improve corrosion resistance and give the screw a distinctive yellow finish. It is commonly used for carbon steel fasteners in general industrial applications.
Q Are free samples available before placing a bulk order?
A Yes, free samples are available. You can request samples to verify the size, material, grade, and surface treatment before committing to a large order, ensuring the product meets your specific application requirements.
Q What standards do these hexagonal socket screws conform to?
A These screws are manufactured to DIN and ISO international standards (e.g., ISO 4762 / DIN 912 for socket head cap screws, DIN 7991 for countersunk socket screws), and the production facility is certified to ISO 9001 quality management standards.