These internal hex pan-head combination screws are manufactured in strict compliance with German standards. Featuring an integrated design that combines the screw, flat washer, and spring washer into a single unit, they eliminate the need for separate component assembly, thereby significantly boosting installation efficiency. Crafted using cold heading and thread rolling processes to ensure precision threading, and paired with an internal hex pan-head design, these fasteners facilitate efficient torque transmission—without slipping—even in space-constrained environments. The integrated spring washer provides continuous preload to prevent loosening, while the flat washer distributes pressure to protect the workpiece; suitable for applications in mechanical manufacturing, electronic equipment, automotive assembly, and other fields, 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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