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Carriage Bolt DIN603 - High-Quality China Suppliers & Factory with Competitive Pricing and Extensive Certifications
| 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: 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.
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 Type | Coating Thickness | Corrosion Resistance | Applicable Scenarios |
|---|---|---|---|
| Electroplated Zinc | 5–20 μm | General | Indoor equipment, low corrosion environment |
| Hot-Dip Galvanizing | 50–150 μm | Excellent | Outdoor, chemical, and marine environments |
🏆 Core Advantages
🛡️ Corrosion Resistance
💰 Economy
🔧 Low Maintenance
🔗 Adaptability
- 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 and ocean engineering: Deck lifting mechanism, valve control (resistant to salt spray corrosion).
- Chemical equipment: Reaction kettle transmission system, pipeline regulating device (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
1 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 creates a much thicker coating of 50–150 μm, offering excellent corrosion resistance for outdoor, marine, and chemical environments.
2 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 strength requirements from general fastening to high-load industrial applications.
3 What materials are used in manufacturing these carriage bolts?
The bolts are manufactured using steel, 35k, 45 steel, 40Cr, and 35CrMo. These materials offer a balance of strength, toughness, and suitability for galvanizing processes.
4 Are free samples available before placing a bulk order?
Yes, free samples are available. You can request samples to verify dimensions, surface finish, and quality before committing to a large order.
5 What standards do your carriage bolts comply with?
Our carriage bolts are manufactured in compliance with DIN and ISO standards, and production is certified under ISO 9001, ensuring consistent quality and reliability.
6 Can galvanized carriage bolts be used in food processing environments?
Yes, galvanized carriage bolts can be used in food processing applications where hygiene standards are required. The smooth zinc surface prevents rust and meets the basic requirements for safe use in such environments.