Carriage Bolt DIN603 - High Quality Carbon Steel Fasteners from China Suppliers and Factory at Competitive Prices
| 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: 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:
Carbon Steel / Stainless Steel
Usually carbon steel (such as 45# steel, 40Cr) or stainless steel, with a zinc layer covering the surface after galvanizing.
Trapezoidal or Ball Screw
Commonly trapezoidal thread (Tr type) or ball screw, the latter is mostly used in high-precision scenarios.
Electroplated vs. Hot-dip Zinc
Divided into electroplated zinc (thin and uniform coating) and hot-dip zinc (thick coating, strong corrosion resistance).
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 |
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.
- 🚜 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).
