Product Description:
DIN7981 screws are self-tapping screws with a pan head design and cross slots that adhere to German standards. They are commonly used for fastening thin metal plates or non-metallic materials. The head type of these screws features a semi-circular disc head, with groove options like H-shaped or Z-shaped cross grooves. In terms of the tail type, DIN7981 screws come with a choice of pointed tail (C-type) or flat tail (F-type), and the appropriate specification can be selected based on the intended application.
Features:
The performance requirements of DIN7981 include the clarity of the screw thread, the accuracy of the tail tooth lifting, and the alignment of the head axis, all of which must meet strict standards.
During the inspection with the cross groove plug gauge, it is crucial to ensure the matching degree of the batch head and to prevent slipping.
Technical Parameters:
Screw Thread
d | ST2.2 | ST2.9 | ST3.5 | (ST3.9) | ST4.2 | ST4.8 | ST5.5 | ST6.3 |
| P | Pitch | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| a | max | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 |
| dk | max=nominal size | 4.2 | 5.6 | 6.9 | 7.5 | 8.2 | 9.5 | 10.8 | 12.5 |
| min | 3.9 | 5.3 | 6.54 | 7.14 | 7.84 | 9.14 | 10.37 | 12.07 |
| k | max=nominal size | 1.8 | 2.2 | 2.6 | 2.8 | 3.05 | 3.55 | 3.95 | 4.55 |
| min | 1.55 | 1.95 | 2.35 | 2.55 | 2.75 | 3.25 | 3.65 | 4.25 |
| y | max | Type C | 2 | 2.6 | 3.2 | 3.5 | 3.7 | 4.3 | 5 | 6 |
| Type F | 1.6 | 2.1 | 2.5 | 2.7 | 2.8 | 3.2 | 3.6 | 3.6 |
| Socket No. | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 |
| M1 | ≈ | 2.6 | 3 | 4.2 | 4.4 | 4.6 | 5 | 6.5 | 7.1 |
| M2 | ≈ | 2.4 | 2.9 | 3.9 | 4.1 | 4.3 | 4.7 | 6.2 | 6.7 |
Applications:
DIN7981 self-tapping screws find primary application in various industries such as electronic appliances, building curtain walls, medical equipment, and packaging machinery. These screws are known for their ease of installation, as they do not need pre-tapped threaded holes. However, it is essential to note that they have limited load-bearing capacity and are not recommended for high-load situations.
The technical specifications of DIN7981 self-tapping screws align closely with international standards such as ISO 7049 and DIN7981. Furthermore, in the context of Chinese standards, they are in harmony with GB/T 845, the equivalent Chinese standard.
Company Certificate:
Packaging:
 |  |  |
| Carton Packaging | Outer Cartonbox Packaging | Pallet Packaging |
| Bolts are packed in neutral packaging boxes, with standard quantities arranged in small cartons. The exact number of units per carton will be confirmed with the customer to align with their specific requirements. Customized packaging configurations are available upon request. | The small cartons are then consolidated into larger master cartons for secure transportation and storage. The quantity per master carton can be customized based on client specifications or aligned with standard logistical requirements. | The palletized units are securely wrapped with waterproof film and reinforced with packaging straps. Customer-specific shipping marks or labels are affixed to each pallet, ensuring clear identification and compliance with logistics requirements. This final packaging stage guarantees weather-resistant protection and stability during transportation. |
