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China Carriage Bolt DIN603 - Quality Fasteners from Leading Suppliers & Factory, Various Materials & Grades Available
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China Carriage Bolt DIN603 - Quality Fasteners from Leading Suppliers & Factory, Various Materials & Grades Available

Discover high-quality fasteners from reputable China suppliers, with prices ranging from US $0.6 to $9.99 per piece. Our minimum order quantity is 100 pieces, and we boast a supply capability of 10,000 pieces per month. We offer various surface treatments including Plain, Zinc Plated (ZP), Galvanized, Hot Dip Galvanized, and Dacromet to meet diverse needs. Our products are crafted from durable materials such as Carbon Steel, Alloy Steel, Stainless Steel, Brass, and Copper. We adhere to multiple standards including DIN, GB, UNC, BSW, and JIS, ensuring reliability and quality. All our fasteners come with certificates such as ISO9001, ISO14001, ISO45001, and SGS, certifying their exceptional quality. Available grades include 4.8, 8.8, 10.9, 12.9, A2-70, A4-70, and A4-80, making us a trusted factory for all your fastening solutions.

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    Product Detail

    Product name Carriage Bolt
    Size M3-100
    Length 10-3000mm or as required
    Grade 4.8 / 8.8 / 10.9 / 12.9
    Material Steel / 35k / 45 / 40Cr / 35Crmo
    Surface treatment Plain / Black / Zinc / HDG
    Standard DIN / ISO
    Certificate ISO 9001
    Sample Free Samples
    Definition and Basic Structure

    A galvanized screw is a transmission component coated with a zinc layer (electroplated zinc or hot-dip zinc) on the surface of the screw. It is primarily used to convert rotational motion into linear motion while offering reliable anti-corrosion capability.

    Base Material: Usually carbon steel (such as 45# steel, 40Cr) or stainless steel, with a zinc layer covering the surface after galvanizing.

    Thread Type: Commonly trapezoidal thread (Tr type) or ball screw; the latter is mostly used in high-precision scenarios.

    Galvanizing Process: Divided into electroplated zinc (thin and uniform coating) and hot-dip zinc (thick coating, strong corrosion resistance).

    Characteristics of Galvanizing Process

    Corrosion Prevention Mechanism:

    🔹 Sacrificial Anode Protection: The zinc layer preferentially oxidizes, delaying the corrosion of the substrate steel.

    🔹 Physical Barrier: A dense zinc layer isolates water vapor, oxygen, and substrate from contact.

    Process Comparison:

    Electroplated Zinc

    Coating Thickness: 5–20 μm

    Corrosion Resistance: General

    Applicable: Indoor equipment, low corrosion environments

    Cost: Low

    Hot-Dip Galvanizing

    Coating Thickness: 50–150 μm

    Corrosion Resistance: Excellent

    Applicable: Outdoor, chemical, and marine environments

    Cost: Medium

    Core Advantages
    Corrosion Resistance Suitable for humid, salt spray, acidic and alkaline environments such as ships and chemical equipment.
    Economy The cost of galvanizing is lower than stainless steel lead screws, and the lifespan is significantly extended.
    Low Maintenance The self-healing properties of the zinc layer reduce the need for frequent maintenance.
    Adaptability Can be matched with various transmission systems such as stepper motors and servo motors.
    Application Scenarios
    • Outdoor Machinery: Construction machinery, agricultural equipment exposed to rainwater and soil environments.
    • Ship & Ocean Engineering: Deck lifting mechanisms and valve controls resistant to salt spray corrosion.
    • Chemical Equipment: Reaction kettle transmission systems and pipeline regulating devices for acid and alkali resistant media.
    • Construction Industry: Automatic doors and windows, lifting platforms with low-cost rust prevention requirements.
    • Food Processing: Meets hygiene standards requiring smooth surfaces and no risk of rust.
    Carriage Bolt Galvanized Screw
    Frequently Asked Questions
    1What is the difference between electroplated zinc and hot-dip galvanized carriage bolts?
    Electroplated zinc bolts have a thinner coating (5–20 μm) and are suitable for indoor or low-corrosion environments at a lower cost. Hot-dip galvanized bolts have a much thicker coating (50–150 μm), offering superior corrosion resistance ideal for outdoor, marine, and chemical environments.
    2What grades are available for galvanized carriage bolts?
    Our galvanized carriage bolts are available in grades 4.8, 8.8, 10.9, and 12.9 to meet a wide range of structural and mechanical strength requirements.
    3What materials are used in the manufacturing of these carriage bolts?
    The bolts are manufactured using high-quality materials including carbon steel, 35k, 45 steel, 40Cr, and 35CrMo, ensuring excellent mechanical performance and durability across various applications.
    4Are galvanized carriage bolts suitable for marine or outdoor use?
    Yes. Hot-dip galvanized carriage bolts are specifically recommended for marine and outdoor applications due to their thick zinc coating that effectively resists salt spray, moisture, and UV exposure over long periods.
    5What standards do your carriage bolts comply with?
    Our carriage bolts are manufactured in accordance with DIN and ISO international standards, and our production facility is certified under ISO 9001 quality management system.
    6Can I get free samples before placing a bulk order?
    Yes, we offer free samples of our galvanized carriage bolts. You can request samples to verify specifications, surface treatment quality, and dimensional accuracy before committing to a full production order.