- ZHUHAI JIALI HARDWARE CO.,LTD.
- +86-756-8586520
SUS304 cross recessed truss head self drilling screw
- Product description： truss head self drilling screw
I. Product Definition: A Specialized Screw Integrating Multiple Functions
The Phillips slot washer-equipped drill-tail 304 round-head washer-integrated self-tapping self-drilling screw has its core features broken down into five parts:
- "Phillips slot" refers to the cross-shaped groove on the screw head, which is compatible with ordinary Phillips screwdrivers for convenient operation.
- "Washer-equipped" means a circular washer (washer) is integrated under the head, eliminating the need for additional flat washers and saving assembly time.
- "Drill-tail" indicates that the screw tip is in the shape of a drill bit (mostly twist drill or pointed drill structure), which can directly drill through and penetrate plates.
- "304" means it is made of 304 stainless steel base material (containing 18% chromium and 8% nickel), providing excellent corrosion resistance.
- "Round-head washer-integrated" refers to the round-shaped head, with the washer under the head formed integrally with the head. This prevents the washer from falling off and ensures a stable contact area.
Its core difference from ordinary self-tapping screws lies in the "drill-tail structure": ordinary self-tapping screws require pre-drilling, while this screw can directly penetrate 0.5-6mm thick metal plates, plastic plates, etc. Additionally, the integrated washer can avoid crushing the surface of the plate during fastening, making it particularly suitable for soft or thin materials (such as color steel tiles and plastic gussets).
II. Structural Features: Dual Design for Efficient Fastening and Protection
The structure of this screw focuses on "efficiency, anti-loosening, and anti-damage", with three notable detailed highlights:
Collaborative Design of Drill-Tail and Thread
The drill bit at the tip is made of high-speed steel (for some high-end models), with a hardness of up to HRC55-60, enabling it to easily penetrate low-carbon steel plates and aluminum alloy plates. The thread is of self-tapping type (thread pitch 1.2-2mm), which can tap threads synchronously after drilling to form a tight engagement and prevent loosening. The transition between the drill-tail and the thread is smooth without steps, ensuring that the thread can cut into the material smoothly after drilling and improving assembly efficiency.
Protective Advantages of Integrated Washer
The washer and the head are manufactured through integral forging. The diameter of the washer is 30%-50% larger than that of the head (e.g., the washer diameter of an M5 screw is approximately 10mm), providing a larger contact area to disperse pressure and avoid crushing soft materials such as color steel tiles and plastic. The surface of the washer is smooth without burrs, fitting tightly with the plate to reduce the infiltration of rainwater and dust and improve sealing performance.
Practical Design of Round Head and Phillips Slot
The round head has smooth edges without sharp corners, avoiding scratches to operators or clothing, and is suitable for scenarios involving human contact such as home furnishings and furniture. The depth of the Phillips slot is ≥1.5mm with clear edges, preventing the screwdriver from slipping after insertion. This is especially helpful in reducing operational errors during high-altitude operations (such as color steel tile installation).
III. Core Advantages: Efficiency, Corrosion Resistance, and Anti-Loosening
Compared with traditional screws, the advantages of this screw are concentrated in three aspects:
First, efficient assembly: It eliminates the three processes of drilling, tapping, and washer installation. It only needs to be directly screwed in with a screwdriver, and the installation time for a single screw can be shortened to less than 10 seconds. This is 3-5 times more efficient than traditional processes, making it particularly suitable for large-area construction (such as the installation of color steel tiles in factories).
Second, corrosion resistance and durability: The 304 stainless steel base material does not rust in outdoor rainwater and humid environments, and can pass a 48-72 hour salt spray test without red rust. Its service life is 5-8 times longer than that of carbon steel screws. Some models also undergo passivation treatment on the surface to further improve corrosion resistance, making them suitable for humid scenarios such as coastal areas and bathrooms.
Third, anti-loosening and anti-crushing: The self-tapping thread engages tightly with the plate, and combined with the pressure dispersion of the integrated washer, the loosening probability in vibrating environments (such as outdoor fan brackets) is 60% lower than that of ordinary screws. The large contact area of the washer can prevent the screw from being pressed into the plate, making it especially suitable for deformable materials such as color steel tiles and plastic plates, ensuring the plate remains flat after fastening.
IV. Application Scenarios: Covering Efficient Fastening Needs in Multiple Fields
With its "efficiency + corrosion resistance" characteristics, this screw is widely used in multiple fields:
- Construction and outdoor fields: For the installation of color steel tile roofs, the M5×25mm specification is commonly used. The drill-tail can penetrate 0.8mm thick color steel tiles, and the integrated washer prevents rainwater infiltration; for the fixing of outdoor fences and guardrails, the M6×30mm specification is mostly used. The 304 material resists wind and rain, avoiding fence loosening caused by rust.
- Home and decoration fields: For the fixing of wardrobe back panels and cabinet side panels (thin multi-layer boards), the M4×16mm specification is commonly used. The drill-tail penetrates the board and then taps threads, and the washer prevents crushing the wood surface; for the installation of plastic gussets and PVC ceilings, the M3×12mm specification is selected. The Phillips slot allows for convenient operation, making it suitable for home DIY decoration.
- Equipment and machinery fields: For the fixing of outdoor distribution boxes and communication base station casings, the M5×20mm specification is commonly used. The 304 material is resistant to humidity, avoiding rust on the equipment casing; for the fixing of small agricultural machinery (such as lawnmower casings), the drill-tail can penetrate thin steel plates, and the integrated washer ensures no loosening during vibration.
V. Usage Precautions
Three points should be noted during use:
- Select the screw length according to the thickness of the plate to ensure that the thread can fully engage after the drill-tail penetrates (e.g., select M5×16mm for 2mm thick color steel tiles).
- Use a Phillips screwdriver of matching specification to avoid damaging the Phillips slot due to an undersized screwdriver head.
- In outdoor or humid environments, prioritize models with waterproof rubber rings (some high-end products) to further improve sealing performance and prevent rainwater from seeping into the interior of the plate.
As an "all-round fastening tool" with high efficiency and corrosion resistance, the Phillips slot washer-equipped drill-tail 304 round-head washer-integrated self-tapping self-drilling screw solves the pain points of traditional screws, such as cumbersome processes, easy rusting, and easy plate crushing, with its "one-step" assembly efficiency, durability of 304 material, and protection of the integrated washer. It has become an indispensable connector in the construction, home furnishing, and outdoor equipment fields, providing a reliable solution for efficient fastening.
