DIN7981

series introduction

# DIN7981 Product Series: A Comprehensive Introduction

## 1. Overview
The DIN7981 product series refers to a specific set of fasteners that adhere to the German Institute for Standardization (Deutsches Institut für Normung) standard DIN7981. These fasteners are widely recognized and used in various industries due to their standardized design, high - quality manufacturing, and reliable performance.

## 2. Product Design and Specifications

### 2.1 General Design
DIN7981 fasteners are typically screws. They feature a pan head design, which is characterized by a rounded top with a flat bearing surface. This design provides a relatively large contact area between the screw head and the surface it is fastened against, distributing the clamping force evenly and reducing the risk of damage to the material being fastened.

### 2.2 Thread Specification
The threads of DIN7981 screws are designed according to specific pitch and diameter standards. The thread profile is carefully engineered to ensure proper engagement with the mating threads in the workpiece. This results in a secure and stable connection, preventing loosening due to vibration or other external forces.

### 2.3 Drive Type
Common drive types for DIN7981 screws include Phillips and Pozidriv. The Phillips drive has a cross - shaped recess in the screw head, which allows for easy installation using a Phillips - tipped screwdriver. The Pozidriv drive is an improved version of the Phillips drive, with additional ribs in the recess. This design provides better torque transfer, reducing the likelihood of cam - out (slipping of the screwdriver out of the recess) during installation.

### 2.4 Material and Finish
- **Materials**: DIN7981 screws are commonly made from carbon steel, stainless steel, and alloy steel. Carbon steel screws are cost - effective and offer good strength for general applications. Stainless steel screws are highly resistant to corrosion, making them suitable for use in harsh environments such as outdoor or marine applications. Alloy steel screws provide enhanced strength and durability, often used in high - stress applications.
- **Finishes**: To further enhance the performance and appearance of the screws, various finishes can be applied. Zinc plating is a common finish that provides a layer of corrosion protection. Other finishes such as black oxide, which not only offers some corrosion resistance but also gives the screws a black, aesthetically pleasing appearance.

## 3. Applications

### 3.1 Machinery and Equipment Manufacturing
In the manufacturing of machinery and equipment, DIN7981 screws are used to assemble various components. They are used to fasten covers, brackets, and panels to the main body of the machine. For example, in the assembly of a motor, these screws can be used to attach the motor housing to the base, ensuring a stable and secure connection.

### 3.2 Automotive Industry
The automotive industry also makes extensive use of DIN7981 fasteners. They are used in the assembly of interior components such as dashboard panels, door trims, and seat frames. Additionally, they can be found in the engine compartment, where they are used to fasten small components like sensors and wiring harness brackets.

### 3.3 Electronics and Electrical Appliances
In the electronics and electrical appliance sectors, DIN7981 screws are used to assemble printed circuit boards (PCBs), enclosures, and other components. Their small size and precise threading make them suitable for use in delicate electronic devices, ensuring that the components are held together securely without causing damage to the sensitive electronic parts.

### 3.4 Furniture Manufacturing
Furniture manufacturers use DIN7981 screws to assemble different parts of furniture, such as attaching legs to a tabletop or joining the frames of chairs. The pan - head design of these screws provides a smooth and aesthetically pleasing finish on the surface of the

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