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Carbon Steel Hex Head Machine Screws - Zinc Plated, Coarse Thread, China Suppliers, Factory Bulk Wholesale for Industrial Equipment
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Carbon Steel Hex Head Machine Screws - Zinc Plated, Coarse Thread, China Suppliers, Factory Bulk Wholesale for Industrial Equipment

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Discover our high-quality machine screws designed for pre-tapped holes or nuts, featuring a full thread from head to tip. Our screws are available in a range of durable materials including stainless steel, brass, aluminum, and bronze. Choose from various head styles such as Phillips pan head, flat head, hex head, slotted, and round head. We offer metric sizes ranging from M2 to M6, classified under grades 4.8, 6.8, 8.8, 10.9, and 12.9. Ideal for electronics, appliances, instruments, and machinery assembly, our products are manufactured in China by reliable suppliers and factories, ensuring top-notch quality and performance.

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    🔩 What Are Machine Screws

    Machine screws are different from wood screws or self tapping screws. They do not cut their own thread. Instead, they need a pre tapped hole or a nut to hold tight. This makes them perfect for metal to metal fastening where you need a strong, reliable joint that can be taken apart later.

    💡 Why Use Machine Screws

    You get consistent clamping force every time. The thread runs the full length of the screw from under the head to the tip. This full thread design lets you use the screw with different material thicknesses. You can also take them apart without damaging the threads.

    🔧 Head Styles We Offer
    Phillips Pan Head

    The most common style. Works with any standard Phillips screwdriver. Good for general assembly work.

    Flat Head

    Has an 82 degree countersunk cone. When driven in, the head sits flush with the surface. Great for finished panels where appearance matters.

    Hex Head

    Works with a wrench or socket. You can get higher torque than a screwdriver. Good for applications that need a tight clamp.

    Slotted Round Head

    Has a traditional straight line slot and a domed top. Simple and works for light to medium duty jobs.

    ⚙️ Materials Available
    🛡️
    Stainless Steel
    Does not rust. Good for outdoor use and wet areas.
    Steel + Zinc
    Strong and affordable. Zinc coating gives rust protection.
    Brass
    Does not rust. Not magnetic. Common for electrical and decorative work.
    🪶
    Aluminium
    Lightweight. Not magnetic. Good for weight sensitive applications.
    Bronze
    Good corrosion resistance. Often used for marine hardware.
    📐 Sizes and Grades
    Metric Sizes
    M2 – M6
    Lengths
    3mm – 100mm
    Strength Grades
    Class 4.8 – 12.9

    Need something bigger or smaller? Just ask. Pick what fits your job — from light duty to heavy duty.

    🏭 Where People Use Them
    • Electronics enclosures & PCB mounting
    • Home appliances & industrial equipment
    • Automotive parts & precision instruments
    • Switch plates & computer hardware
    • Medical devices
    • General machinery assembly
    Quality You Can Trust

    Every batch goes through thread gauging and dimensional checks. We test hardness too. Need a special head style or custom material? We can make it. Bulk pricing available. Factory direct shipping worldwide.

    🔍 Thread Gauging
    📏 Dimensional Checks
    💪 Hardness Testing
    🌍 Worldwide Shipping
    🏷️ Bulk Pricing
    🛠️ Custom Options
    • Full thread from head to tip for consistent clamping
    • Needs pre tapped hole or nut — does not self tap
    • Phillips pan head, flat head, hex head, slotted round head
    • Stainless steel, steel, brass, aluminium, bronze
    • Metric M2 to M6 — Class 4.8 to 12.9
    • Perfect for electronics, appliances, instruments & machinery
    Welcome to Yuhuang Fastener!
    Feel free to send your inquiry with product details, specifications, or custom requirements. We'll reply to you within 24 hours with a professional quote.
    Frequently Asked Questions
    What is the difference between a machine screw and a self tapping screw?
    Machine screws require a pre tapped hole or a nut to fasten securely. They do not cut their own threads. Self tapping screws, on the other hand, cut threads directly into the material as they are driven in. Machine screws are preferred when you need a stronger, more precise, and reusable joint.
    What materials are your machine screws available in?
    We offer machine screws in stainless steel, zinc plated steel, brass, aluminium, and bronze. Each material suits different environments — for example, stainless steel and bronze are ideal for corrosion resistance, while aluminium is best for lightweight applications.
    What metric sizes and lengths do you stock?
    We stock metric sizes from M2 to M6, with lengths ranging from 3mm to 100mm. If you need sizes outside this range, please contact us — we can accommodate custom requirements for bulk orders.
    Which head style should I choose for my application?
    It depends on your use case. Phillips pan head is the most versatile for general assembly. Flat head is ideal when you need the screw to sit flush with the surface. Hex head provides higher torque for tight clamp applications. Slotted round head is suitable for light to medium duty jobs with a traditional look.
    Do you offer custom machine screws or special specifications?
    Yes. We can produce machine screws with custom head styles, special materials, non-standard lengths, or specific strength grades. Please send your inquiry with detailed specifications and we will provide a professional quote within 24 hours.
    How do you ensure the quality of your machine screws?
    Every production batch undergoes strict quality control including thread gauging, dimensional inspection, and hardness testing. We ensure each screw meets the required strength grade and dimensional tolerance before shipment. Factory direct supply guarantees consistent quality and competitive pricing.