DIN 7504 O Hex Head Self-Drilling Screw

The high-quality DIN 7504 O Hex Head Self-Drilling Screw produced by Wanluo Factory features an integrated one-piece drill tail structure. It eliminates the need for pre-drilling and tapping, and can complete the entire process of drilling, threading, and locking in one step. This fundamentally addresses the industry pain points of ordinary self-drilling screws, such as insufficient torque, tool slipping, and weak tightening strength. Combined with heat treatment strengthening technology and multiple material options, it is suitable for long-term load-bearing fixation and high-frequency vibration conditions of various heavy metal structures. It is the core preferred fastener for industrial steel structure assembly.

Differential Advantage

1. The hexagonal head has a higher torque limit, suitable for heavy-load locking conditions.

The conventional DIN7504K round head and DIN7504M countersunk models all adopt a cross-slot drive structure. The force-bearing slots are shallow and the torque-bearing capacity is limited. When locking with high torque, the slots are prone to slipping, chipping, and rounding failure. However, the O-type external hexagonal structure has uniform force distribution and a large contact area. It can withstand the high torque output of electric and pneumatic tools and is suitable for the pressing locking requirements of heavy steel structures, eliminating the problem of head slipping and damage.

2. Integrated quenching process, with stronger overall hardness and penetration

The entire screw is processed using a high-temperature heat treatment and cold forging integrated forming process. The metal structure is dense and uniform, with a hardness far higher than that of ordinary untreated self-drilling screws. The precisely ground triangular drill tail edge is sharp and regular, with stable penetration, and can directly drill through thick steel plates and laminated metal profiles. The operation process does not cause hole misalignment, tail breakage, or deformation, significantly improving the construction efficiency of thick materials.

3. Universal tooling compatibility, industrial construction compatibility is maximized

The standard German hexagon tolerance size can perfectly match all conventional hexagonal wrenches, electric sockets, and pneumatic tightening tools on the market. No need for custom-made special tools. The adaptability for batch construction in the field and factory is extremely strong, effectively reducing the cost of tooling matching, and meeting the efficient operation requirements of assembly lines and outdoor projects.

4. Full tooth tight pattern design, more reliable anti-loosening and better load-bearing capacity

The thread of DIN 7504 O Hex Head Self-Drilling Screw adopts a full-density precision rolling process. The tooth shape is full and thick, with a very small interlock gap. After locking, it is tightly adhered. Under conditions of equipment vibration, steel structure deformation, and outdoor wind pressure vibration, it is less likely to experience thread loosening or displacement sliding problems. The static load-bearing and dynamic fatigue resistance performance far exceed that of ordinary self-drilling screws.

5. Dual material options, balancing strength and weather resistance

Two mainstream material options are provided: high-strength galvanized carbon steel and stainless steel. The carbon steel model has high hardness and strong load-bearing capacity, suitable for indoor heavy-load steel structure assembly; the stainless steel model is corrosion-resistant and anti-rust, capable of long-term coping with outdoor rain, dampness, and acid-base corrosion environments, suitable for all-weather construction scenarios.

Structural Features & Manufacturing Technology

DIN 7504 O hexagon head self-drilling screws adopt integrated cold forging forming and overall high-temperature heat treatment process, with high overall structural density and hardness. The standard external hex head features accurate dimensional tolerance, perfect matching with universal hex wrenches, electric hex sleeves and pneumatic tools, realizing high-torque locking without tool slipping or head rounding. The precisely ground triangular drill tail has sharp cutting edge and stable penetration performance, capable of quickly drilling thick steel plates, iron profiles and metal stacked plates without tail breaking, deformation or hole deviation. The full and dense thread profile provides ultra-strong gripping force, effectively resisting vibration loosening and bearing tension. With premium stainless steel and high-strength galvanized carbon steel options, the screw delivers excellent wear resistance, fatigue resistance and corrosion resistance for long-term heavy-load fastening.

Product Parameter

Core Advantages & Industrial Applications

1. External hex head design supports ultra-high torque tightening, completely solving the defects of cross recess screw head slippage and groove collapse during high-strength locking, suitable for heavy-load fastening that cross-type drill tail screws cannot bear.

2. Integrated drill tail three-in-one function eliminates pre-drilling and secondary processing, greatly improving the efficiency of steel structure construction. It can directly drill and lock thick steel plates and multi-layer metal profiles, saving construction time and labor costs.

3. High-strength integral forging and heat treatment process ensures excellent structural toughness and drilling hardness. The drill tail is not easy to break, and the screw body is not easy to deform under high torque, maintaining stable fastening performance in long-term vibration environments.

4. Larger head bearing area disperses fastening pressure evenly, providing stronger clamping force and tensile resistance than ordinary cross drill tail screws, effectively avoiding loose connection caused by equipment vibration and load impact.

5. Multiple anti-corrosion material and surface treatment options adapt to indoor heavy machinery assembly, outdoor steel structure engineering, bridge auxiliary facilities and marine humid corrosive environments for long-term stable use.

User Purchase Reviews

Steel Structure Engineering Contractor

We have been engaged in the construction of factory steel structures for a long time. Previously, we encountered numerous problems with the cross-head self-drilling screws, as they tended to slip and break when drilling thick steel plates, resulting in a high rate of rework. After switching to this DIN 7504 O Hex Head Self-Drilling Screw, the experience has significantly improved. The socket resists force well, and the high torque can firmly fix thick profiles without rounding, with sufficient drill tail penetration power. It can be locked in one step, and the construction speed is fast. The overall failure rate is extremely low, making it very convenient for large-scale engineering projects.

Outdoor Equipment Manufacturer

Our outdoor load-bearing equipment is used outdoors and requires high strength and rust prevention. This stainless steel external hexagonal self-drilling screw is well-made, with precise threads, sufficient locking force, and will not loosen even after being exposed to wind and sun, or subjected to slight vibrations. No pre-drilling is required, the assembly process is simple, and it meets the production needs of our batch equipment. The quality is very stable.

Hardware Wholesale Trader

The German standard specifications are very standard, with zero size deviation. It is suitable for various steel structure assembly requirements both domestically and internationally, and has extremely strong versatility. The screws after heat treatment have sufficient hardness, and customers have reported that they do not break at thick iron or laminated plates during construction. The galvanized model also has good rust prevention effect. Compared to ordinary cross self-drilling screws, this heavy-duty performance advantage is obvious, and the repurchase rate is very high.

Mechanical Assembly Processing Factory

It is mainly used for heavy machine frames and metal plate splicing and fixation, requiring large torque locking to ensure structural stability. This hexagonal self-drilling screw perfectly fits the electric socket tool, with controllable and uniform locking force, and will not have situations of not locking tightly, slipping, or spinning. The consistency of multiple batch assemblies is high, and it is a must-have accessory for heavy machinery assembly.