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China Suppliers Factory Carriage Bolt DIN603 - Carbon Steel, Stainless Steel, Zinc Plated, ISO Certified
| 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
Definition: Galvanized screw is a transmission component that is coated with a zinc layer (electroplated zinc or hot-dip zinc) on the surface of the screw. It is mainly used to convert rotational motion into linear motion and has anti-corrosion ability.
Core Structure:
- 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:
| Process Type | Coating Thickness | Corrosion Resistance | Applicable Scenarios |
|---|---|---|---|
| Electroplated Zinc | 5–20 μm | General | Indoor equipment, low corrosion environments |
| Hot-Dip Galvanizing | 50–150 μm | Excellent | Outdoor, chemical, and marine environments |
⭐ 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 that of 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, valve control — resistant to salt spray corrosion.
🧪
Chemical Equipment
Reaction kettle transmission systems, pipeline regulating devices — acid and alkali resistant.
🏢
Construction Industry
Automatic doors and windows, lifting platforms — low-cost rust prevention requirements.
🍽️
Food Processing
Meets hygiene standards — smooth surface with no risk of rust contamination.
❓ Frequently Asked Questions
Q
What is the difference between electroplated zinc and hot-dip galvanizing on carriage bolts?
Electroplated zinc provides a thin, uniform coating (5–20 μm) suitable for indoor or low-corrosion environments. Hot-dip galvanizing produces a much thicker coating (50–150 μm), offering superior corrosion resistance for outdoor, marine, and chemical environments.
Q
What grades are available for galvanized carriage bolts?
Our galvanized carriage bolts are available in grades 4.8, 8.8, 10.9, and 12.9, covering a wide range of load-bearing and structural requirements.
Q
Are galvanized carriage bolts suitable for marine or outdoor environments?
Yes. Hot-dip galvanized carriage bolts are especially well-suited for marine, outdoor, and chemical environments due to their thick zinc coating that provides excellent resistance to salt spray, moisture, and corrosive media.
Q
What surface treatments are available for carriage bolts?
We offer four surface treatment options: Plain (no coating), Black (black oxide), Zinc (electroplated zinc), and HDG (Hot-Dip Galvanized). Each option suits different application environments and corrosion resistance requirements.
Q
Can I get free samples before placing a bulk order?
Yes, free samples are available. You can request samples to evaluate the quality, dimensions, and surface finish of our carriage bolts before committing to a large order.
Q
What standards and certifications do your carriage bolts comply with?
Our carriage bolts are manufactured in compliance with DIN and ISO standards, and our production facility holds ISO 9001 certification, ensuring consistent quality control throughout the manufacturing process.