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. |
