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China Hexagon Socket Head Cap Bolt DIN 912 - Factory Direct Suppliers, Carbon Steel & Stainless Steel, ISO Certified
| 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
Definition: 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.
🔩 Head Types
Common cylindrical heads (ISO 4762 / DIN 912), countersunk heads (DIN 7991), flat heads, etc. — suitable for different installation requirements (e.g., countersunk heads for flush-surface scenarios).
🔧 Thread Type
Full thread or half thread, available in various materials and surface treatments to suit diverse engineering needs.
Materials and Surface Treatment
Common materials:
⚙️ Carbon Steel (8.8 / 12.9 Grade)
High strength — widely used in machinery and automotive applications.
🛡️ Stainless Steel (304 / 316)
Excellent corrosion resistance — ideal for outdoor environments and medical equipment.
✈️ Titanium Alloy
Lightweight with high corrosion resistance — used in aerospace engineering.
Application Scenarios
🏭 Industrial Field
Machine tools, molds, automation equipment — high-strength connections that require frequent disassembly.
🚗 Automotive / Aviation
Engine components, chassis — designed for high temperature resistance and vibration resistance.
💻 Consumer Electronics
Laptops, cameras — precision small-sized screws (e.g., M1.6).
🪑 Furniture / Bicycle
IKEA furniture assembly, bicycle brake systems — countersunk design prevents scratching.
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 (e.g., 90°).
- Regularly check the torque (using a torque wrench) to prevent over-tightening or loosening.
Frequently Asked Questions
QWhat is a hexagonal socket screw and how does it differ from a regular screw?
A hexagonal socket screw (also known as an Allen bolt) features a hexagonal recessed drive hole in the head, requiring an Allen key or hex bit for installation. Unlike Phillips or flat-head screws, the internal hex design allows higher torque application with less risk of cam-out, making it ideal for precision and high-strength applications.
QWhat sizes and grades are available for hexagonal socket screws?
These screws are available in sizes M6, M8, M10, and M12, with strength grades of 4.8, 8.8, 10.9, and 12.9. Higher grade numbers indicate greater tensile strength, with 12.9 being the highest and commonly used in demanding structural applications.
QWhat materials are hexagonal socket screws made from?
They are commonly manufactured from carbon steel, stainless steel (304 or 316), and titanium alloy. Carbon steel offers high strength for mechanical use, stainless steel provides corrosion resistance for outdoor or medical environments, and titanium alloy is preferred in aerospace for its lightweight and durability.
QWhat does YZP surface treatment mean?
YZP stands for Yellow Zinc Plating, a surface treatment that applies a thin zinc coating to the screw. This enhances corrosion resistance and provides a distinctive yellow-gold appearance. It is widely used in industrial and automotive fasteners to extend service life in moderately corrosive environments.
QWhich standards do these hexagonal socket screws comply with?
These screws conform to DIN and ISO standards — specifically DIN 912 and ISO 4762 for cylindrical head socket screws, and DIN 7991 for countersunk variants. Compliance ensures dimensional accuracy and interchangeability across international applications. The manufacturing facility is also ISO 9001 certified.
QAre free samples available before placing a bulk order?
Yes, free samples are available. You can request samples to verify dimensions, material quality, and surface finish before committing to a large order. This allows buyers to conduct fit tests and quality checks to ensure the screws meet their specific application requirements.