Carriage Bolt DIN603 - High-Quality Fasteners from China Suppliers & Factory, Various Materials and Finishes
| 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 | Cost |
|---|---|---|---|
| Galvanized (Electroplated) | 5-20 μm | For general indoor equipment, with low corrosion environment | Low |
| Hot dip galvanizing | 50-150 μm | Excellent in outdoor, chemical, and marine environments | Moderate |
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 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
What is a galvanized screw?
A galvanized screw is a transmission component coated with a protective zinc layer (either through electroplating or hot-dip galvanizing) on its surface. It is primarily used to convert rotational motion into linear motion while offering excellent rust and corrosion resistance.
What is the difference between electroplated galvanizing and hot-dip galvanizing?
Electroplated galvanizing produces a thin, uniform zinc coating (5-20 μm) suitable for indoor use with low corrosion risks. Hot-dip galvanizing provides a much thicker coating (50-150 μm), offering superior corrosion resistance for harsh outdoor, chemical, and marine environments.
What materials and grades are available for these bolts?
These carriage bolts are manufactured using high-quality materials including Steel, 35k, 45# steel, 40Cr, and 35Crmo. They are available in strength grades of 4.8, 8.8, 10.9, and 12.9.
What are the primary advantages of using galvanized screws?
Key advantages include high corrosion resistance in acidic, alkaline, and humid conditions, cost-effectiveness compared to stainless steel, low maintenance requirements due to the self-healing properties of zinc, and high compatibility with various motor and transmission systems.
In what industries are galvanized screws commonly applied?
They are widely used in outdoor machinery, ship and ocean engineering (such as deck lifting mechanisms), chemical processing equipment, the construction industry (for automatic doors and windows), and food processing machinery requiring hygienic, rust-free operations.