Products Description
The Knurled Double Thread Hex Washer Head Self Drilling Screws are high - performance fasteners designed for a wide range of applications. The hex washer head provides a large bearing surface, which helps to distribute the load evenly and prevent surface damage. The knurled surface on the head not only offers a better grip for easy installation and removal but also adds an anti - slip feature, ensuring the screw remains firmly in place during operation.
The double - thread design is a key feature of these screws. It allows for faster penetration into the material, reducing installation time significantly. The two sets of threads work in tandem to cut through various materials such as metal, wood, and plastic, making them extremely versatile. The sharp point at the end of the screw enables it to start drilling into the material without the need for pre - drilling in most cases, further streamlining the installation process.
Technical Parameters:
Screw Size
Available in a variety of diameters, typically ranging from M3 to M10, and lengths from 10mm to 100mm. The specific sizes can be customized according to customer requirements.
Thread Pitch
The double - thread design has different pitch options depending on the screw size. For example, for a M5 screw, the pitch of each thread set might be 0.8mm, which is optimized for fast penetration and secure fastening.
Material Strength
Carbon steel screws usually have a tensile strength in the range of 4.8 to 8.8 grade. A 4.8 - grade carbon steel screw has a minimum tensile strength of 400 N/mm² and a yield strength of 320 N/mm². Stainless steel screws, depending on the alloy, can have a tensile strength ranging from 500 N/mm² to over 1000 N/mm².
Corrosion Resistance
Stainless steel screws offer high corrosion resistance due to their chromium content. For example, 304 stainless steel, with a chromium content of approximately 18%, provides good resistance to general corrosion. Zinc - plated carbon steel screws can also withstand a certain level of corrosion, with a salt - spray test resistance of up to 24 - 96 hours depending on the thickness of the zinc coating.
Products Process
The production of Knurled Double Thread Hex Washer Head Self-Drilling Screws involves several precise steps to ensure high quality and performance:
Material Selection: High-strength steel or stainless steel is selected based on the application requirements, ensuring durability and corrosion resistance.
Cold Forging: The screws are manufactured using cold forging techniques, which enhance the mechanical properties of the material, providing strength and resilience.
Knurling and Threading: The knurled design is created through precision machining, which improves grip and prevents slippage during installation. The double-thread configuration is also rolled to enhance holding power.
Self-Drilling Tip Formation: The self-drilling tip is precisely machined to ensure efficient penetration into various substrates without the need for pre-drilling.
Surface Finishing: To enhance corrosion resistance and aesthetic appeal, the screws may be coated with finishes such as zinc plating, black oxide, or other protective coatings.
Quality Control: Each batch undergoes rigorous quality inspections, including dimensional checks, tensile strength tests, and corrosion resistance evaluations, ensuring compliance with industry standards.
Products Application
Knurled Double Thread Hex Washer Head Self-Drilling Screws are used in a variety of applications, including:
Construction: Ideal for securing metal roofing, siding, and structural components, providing reliable connections in both residential and commercial projects.
HVAC Systems: Commonly used in the assembly of ductwork and HVAC installations, ensuring secure and stable connections.
Automotive Industry: Employed in automotive manufacturing for fastening metal parts and components, where strength and reliability are critical.
Manufacturing: Suitable for machinery assembly and equipment construction, ensuring strong and durable connections.
Outdoor Applications: Perfect for outdoor furniture, fencing, and decking applications due to their corrosion-resistant properties.
FAQ
1. How can I place an order?
You can contact any of our sales person for an order. Please provide the details of your requirements as clear as possible. So we can send you the offer at the first time.For designing or further discussion, it is better to contact us with Skype, TradeManger or QQ or WhatsApp or other instant ways, in case of any delays.
2. When can I get the price?
Usually we quote within 24 hours after we get your inquiry.
3. Can you do the design for us?
Yes. We have a professional team having rich experience in gift box design and manufacturing.Just tell us your ideas and we will help to carry out your ideas into perfect boxes.
4. How long can I expect to get the sample?
After you pay the sample charge and send us confirmed files, the samples will be ready for delivery in 1-3 days. The samples will be sent to you via express and arrive in 3-5 days.
5. What about the lead time for mass production?
Honestly, it depends on the order quantity and the season you place the order.Alway 25-28days based on general order.
6. What is your terms of delivery?
We accept EXW, FOB, CFR, CIF, etc. You can choose the one which is the most convenient or cost effective for you.
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