China Suppliers Hexagon Socket Head Cap Bolt DIN 912 - Factory Direct, Various Grades and Surface Treatments Available
| 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 |
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.
Common materials:
Grades 8.8 & 12.9 — high strength, widely used in machinery and automotive applications.
304 / 316 grades — corrosion-resistant, suitable for outdoor and medical equipment environments.
Lightweight with high corrosion resistance — used in aerospace and high-performance applications.
Machine tools, molds, automation equipment — high-strength connections that require frequent disassembly.
Engine components, chassis — designed for high temperature resistance and vibration resistance.
Laptops, cameras — precision small-sized screws such as M1.6 for delicate assemblies.
IKEA furniture assembly, bicycle brake systems — countersunk design prevents surface scratching.
- 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.
