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Carriage Bolt DIN603 - High-Quality Carbon Steel from China Suppliers & Factory - ISO Certified Manufacturer
| 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 |
|---|---|---|---|
| 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: 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
QWhat is a galvanized carriage bolt and how does it differ from a standard bolt?
AA galvanized carriage bolt is a fastener coated with a zinc layer through electroplating or hot-dip galvanizing. Unlike standard bolts, the zinc coating acts as both a physical barrier and a sacrificial anode, significantly extending the bolt's service life in corrosive environments such as outdoor, marine, and chemical applications.
QWhat is the difference between electroplated zinc and hot-dip galvanizing?
AElectroplated zinc provides a thinner, more uniform coating (5–20 μm), suitable for indoor and low-corrosion environments. Hot-dip galvanizing offers a much thicker coating (50–150 μm) with excellent corrosion resistance, making it ideal for outdoor, marine, and chemical environments.
QWhat grades and materials are available for these carriage bolts?
ACarriage bolts are available in grades 4.8, 8.8, 10.9, and 12.9. Material options include steel, 35K, 45 carbon steel, 40Cr, and 35CrMo alloy steel, allowing you to select the right combination based on required strength and application conditions.
QWhat surface treatment options are available, and which should I choose?
AAvailable treatments include Plain (no coating), Black oxide, Zinc electroplating, and HDG (Hot-Dip Galvanizing). For general indoor use, zinc plating is sufficient. For outdoor, marine, or chemically aggressive environments, HDG is recommended for maximum durability.
QAre free samples available before placing a bulk order?
AYes, free samples are available. You can request a sample to evaluate the quality, dimensional accuracy, and surface finish of the carriage bolts before committing to a large-volume order.
QWhat standards and certifications do these carriage bolts comply with?
AThe carriage bolts are manufactured in compliance with DIN and ISO dimensional standards, and production is carried out under an ISO 9001 certified quality management system, ensuring consistent product quality, traceability, and reliability across every batch.