Product Description:
DIN7981 screws refer to German standard cross slot pan head self tapping screws, primarily designed for fastening connections of thin metal plates or non-metallic materials. The head type of these screws is a semi-circular disc head, featuring groove types such as cross groove (H-shaped or Z-shaped). At the same time, the tail types include pointed tail (C-type) or flat tail (F-type), giving users the option to choose different specifications based on the intended use.
DIN7981 screws are known for their versatility and are commonly used in a variety of applications due to their excellent fastening capabilities. Whether it's securing thin metal plates together or connecting non-metallic materials, these screws provide reliability and durability. The wide range of specifications available ensures that users can select the most suitable option for their specific needs.
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. These aspects are mandated to meet strict standards to ensure the quality and functionality of the fastener product.
Additionally, the inspection using the cross groove plug gauge in DIN7981 is crucial in verifying the compatibility and precision of the batch head. This inspection process is essential to prevent any slipping issues that may arise during the fastening operation.
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
DIN7981 self tapping screws find their main applications in electronic appliances, building curtain walls, medical equipment, and packaging machinery. These screws are known for their ease of installation without the necessity for pre-tapping threaded holes. However, it is important to note that they have a lower load-bearing capacity and are not well-suited for high load scenarios.
Technical Specifications
The technical specifications of DIN7981 self tapping screws are essentially in line with ISO 7049 and DIN7981 standards, and the Chinese equivalent standard GB/T 845.
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. |
