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China Carriage Bolt DIN603 | Quality Fasteners from Reliable Suppliers & Factory
| 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 mainly used to convert rotational motion into linear motion and has anti-corrosion ability.
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 (e.g., 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, valve control (resistant to salt spray corrosion).
- Chemical Equipment: Reaction kettle transmission systems, pipeline regulating devices (acid and alkali resistant medium).
- Construction Industry: Automatic doors and windows, lifting platforms (low-cost rust prevention requirements).
- Food Processing: Meets hygiene standards (requires smooth surface and no risk of rust).
Frequently Asked Questions
Q What is the difference between electroplated zinc and hot-dip galvanizing on carriage bolts?
Electroplated zinc produces a thin, uniform coating of 5–20 μm, suitable for indoor or low-corrosion environments. Hot-dip galvanizing applies a much thicker coating of 50–150 μm, providing excellent 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 mechanical strength requirements for different applications.
Q What materials are used for carriage bolts?
Carriage bolts are manufactured from Steel, 35k, 45 carbon steel, 40Cr, and 35CrMo alloy steel, ensuring excellent mechanical performance and suitability for various industrial applications.
Q Are galvanized carriage bolts suitable for marine or chemical environments?
Yes. Hot-dip galvanized carriage bolts are specifically suited for marine, offshore, and chemical environments due to their thick zinc coating that provides superior resistance to salt spray, moisture, and corrosive media.
Q Can I get free samples before placing a bulk order?
Yes, free samples are available. You can request samples to evaluate the product quality, dimensions, and surface treatment before committing to a bulk order.
Q What standards and certifications do your carriage bolts comply with?
Our carriage bolts comply with DIN and ISO international standards and are manufactured under an ISO 9001 certified quality management system, ensuring consistent product quality and reliability.