Hot Products
0102030405
Carriage Bolt DIN603 - Quality Carbon Steel Fasteners from China Suppliers & Factory, 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 |
1
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).
2
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 environment |
| Hot-Dip Galvanizing | 50–150 μm | Excellent | Outdoor, chemical, and marine environments |
3
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.
4
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
Q
What is the difference between electroplated zinc and hot-dip galvanizing on carriage bolts?
Electroplated zinc produces a thinner coating (5–20 μm) suited for indoor or low-corrosion environments, while hot-dip galvanizing creates a much thicker coating (50–150 μm) with superior corrosion resistance, making it ideal for outdoor, marine, or chemical environments.
Q
What strength grades are available for carriage bolts?
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 for different engineering applications.
Q
Can galvanized carriage bolts be used in marine or saltwater environments?
Yes. Hot-dip galvanized carriage bolts are well suited for marine and ocean engineering, such as deck lifting mechanisms and valve control systems, as the thick zinc coating provides excellent resistance to salt spray corrosion.
Q
What surface treatment options are offered for carriage bolts?
Available surface treatments include Plain (no coating), Black oxide, Zinc (electroplated), and HDG (Hot-Dip Galvanized). The appropriate choice depends on the application environment and required level of corrosion protection.
Q
Are free samples available before placing a bulk order?
Yes, free samples are available. This allows buyers to inspect dimensions, material quality, thread accuracy, and surface finish before committing to a full production order.
Q
What international standards do these carriage bolts comply with?
The carriage bolts comply with DIN and ISO international standards and are produced under an ISO 9001 certified quality management system, ensuring consistent dimensional accuracy and product reliability.