Blackened Half-Threaded Hexagonal Bolts (DIN 931) Overview

Blackened half-threaded hexagonal bolt (DIN 931) is a hexagonal head bolt that meets the DIN 931 standard and has a half-thread design. It is commonly used in the machinery and construction industries. The surface of this type of bolt is blackened, which mainly provides corrosion protection and improves the surface hardness.

Blackened half-threaded hexagonal bolt (DIN 931) is a bolt that meets the German industrial standard DIN 931. Its main feature is the half-thread design (that is, part of the length of the bolt has threads). This design usually makes it more stable and safe in some fixing applications. The surface of the bolt is blackened to give it a certain degree of corrosion resistance and a black surface.

Application of Blackened Half-Threaded Hexagonal Bolt

Blackened half-threaded hexagonal bolts are suitable for various scenarios that require reliable connections, especially in the following fields:

• Mechanical equipment: used for the connection and fixation of mechanical equipment, especially in environments with high strength requirements.
• Automotive industry: used for the connection of automobile chassis, engines and other key components.
• Construction industry: used in steel structures or building frames to connect steel and other building materials.
• Electrical industry: used in electrical equipment, such as motors and electrical equipment assembly.
• Construction machinery: such as the assembly of heavy equipment such as cranes and excavators.

Feature of Blackened Half-Threaded Hexagonal Bolt

• Blackening treatment: Through chemical oxidation treatment, a black oxide film is formed on the surface, providing good corrosion resistance and wear resistance.
• Semi-threaded design: The semi-threaded design allows the bolt to have higher tensile strength in the application and can provide stronger fixing force in environments with greater force.
• High strength: Bolts that meet DIN 931 standards generally have higher strength and are suitable for connections with greater loads.
• Corrosion resistance: Blackening treatment can effectively prevent corrosion and is suitable for use in environments with moderate humidity. Although it has slightly weaker rust resistance than galvanized bolts, it is less expensive.
• Easy to install: The hexagonal head design makes it easy to tighten with standard tools (such as wrenches or pliers).