These internal hex pan-head combination screws comply strictly with German standards. In addition, the integrated design combines the screw, flat washer, and spring washer into a single unit. As a result, users no longer need to assemble separate components, which significantly boosts installation efficiency.
Manufacturers use cold heading and thread rolling processes to create precision threads. Furthermore, the internal hex pan-head design facilitates efficient torque transmission without slipping, even in space-constrained environments.
Meanwhile, the integrated spring washer provides continuous preload to prevent loosening. At the same time, the flat washer distributes pressure evenly and protects the workpiece surface.
Therefore, these fasteners are suitable for mechanical manufacturing, electronic equipment, automotive assembly, and many other applications. Consequently, they represent a premium fastening solution that balances both reliability and convenience.
| Item | Specification |
|---|---|
| Product Name | Hex Socket Smooth-Head Screw Set (3-in-1) |
| Standard | DIN912 (Hex Socket Cylindrical Head Screw) |
| Structure | Hex socket cylindrical screw + flat washer + spring washer (pre-assembled) |
| Head Feature | Smooth cylindrical head, no knurling, clean appearance |
| Grade | Grade A, high dimensional accuracy for precision assembly |
| Thread Tolerance | 6g |
| Partial Thread Length | ≤2× pitch |
| Screw Tip | Chamfered or rolled (≤M4 rolled) |
| Flat Washer | Inner diameter fits shaft, outer diameter distributes load, prevents indentations |
| Spring Washer | Open type, stable elasticity, vibration-resistant |
| Assembly Process | Washers pre-mounted on smooth shaft, fixed after threading, no displacement, smooth installation |
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