yellow zinc plated eye bolt

yellow zinc plated eye bolt

The Duojia Yellow Zinc Plated DIN 444 Eye Bolt, also referred to as a “live-joint bolt,” is a robust fastener designed for creating flexible and pivoting connections in various industrial and mechanical applications. Manufactured from Carbon Steel and conforming to the DIN 444 dimensional standard, this bolt features a threaded shank and a distinct circular eye head.The key characteristic of this product is its Yellow Zinc Plating. This finish involves electro-plating the bolt with zinc, followed by a yellow chromate passivation process. This two-step coating provides enhanced corrosion resistance compared to standard clear/white zinc plating, making it a durable and cost-effective choice for applications requiring good protection against moisture and oxidation, such as in agricultural machinery and outdoor installations.

Crucial Clarifications on Product Specifications

The product page contains several conflicting or generic data points. The following clarifications provide a precise and accurate understanding of this specific product:

  • Finish (Yellow Zinc vs. Generic List): The “Surface treatment” field correctly identifies the finish as “yellow zinc plated”. The “Finish” field, which lists “Zinc Plated, Polished, Black Oxide Coating,” is a generic list of the company’s overall capabilities and not specific to this featured product. The yellow chromate finish offers superior corrosion resistance over standard clear zinc.
  • Material (Carbon Steel): The specified material is “Carbon Steel”. Zinc plating is a process applied to carbon steel to protect it from rust. Therefore, this product is made from carbon steel, not stainless steel.
  • Grade Inconsistency: The “Grade” field lists both carbon steel property classes (4.8, 8.8, 10.9, 12.9) and stainless steel grades (A2-70, A4-70, A4-80). Since this is a carbon steel product, only the carbon steel property classes are applicable.
  • Lifting Safety: The DIN 444 standard primarily defines the dimensions of the eye bolt, not its lifting capacity. While high-strength grades (e.g., 8.8, 10.9) are suitable for load-bearing, the specific Working Load Limit (WLL) must be confirmed with the manufacturer before using these bolts for any overhead lifting or critical load applications.

Product Parameters (Corrected and Clarified)

Parameter ItemSpecification Description
Product NameYellow Zinc Plated DIN 444 Eye Bolt / Live-Joint Bolt
StandardDIN 444
Brand NameDuojia
Place of OriginHebei, China
MaterialCarbon Steel
Grades4.8 (Standard), 8.8, 10.9, 12.9 (High-Strength)
FinishYellow Zinc Plated (with Yellow Chromate Passivation)
Size RangeM4 to M24 (and larger, up to M36 as per the dimensional table)
Measurement SystemMetric
ApplicationHeavy Industry, General Industry, Agriculture, Mechanical Linkages
⚠️ Safety NoteWorking Load Limit (WLL) must be confirmed before use in any load-bearing application.

Key Features

  • Enhanced Corrosion Resistance: The yellow zinc chromate finish provides a more durable barrier against rust and corrosion than standard clear zinc, extending the service life of the bolt.
  • Flexible “Live-Joint” Connection: The circular eye head is designed to connect with pins or other bolts, allowing for swinging, pivoting, or adjustable mechanical linkages.
  • High-Strength Availability: Offered in various grades, including high-tensile options (8.8, 10.9, 12.9), for reliable performance in demanding load-bearing situations.
  • Standardized Design: Manufactured according to DIN 444 specifications, ensuring dimensional consistency for predictable integration into machinery and fixtures.
  • Cost-Effective Durability: Provides a good balance of performance, corrosion resistance, and affordability for a wide range of applications.

Typical Applications

  • Agricultural Machinery: Ideal for tractor suspension systems and other equipment linkages that require a strong, pivoting connection.
  • Mechanical Linkages: Used in various machines to connect moving parts.
  • Outdoor Installations: Suitable for securing billboards, signage, and other structures where moderate weather resistance is needed.
  • Industrial Jigs and Fixtures: Employed as clamping bolts or pivot points in manufacturing setups.

Installation and Safe Use Guidelines

  1. Verify Load Capacity: Before installation, always confirm the bolt’s rated Working Load Limit (WLL) for your specific application. Never exceed this capacity.
  2. Align Components: Ensure the holes in the parts to be fastened are properly aligned.
  3. Secure the Bolt: Insert the eye bolt through the holes and tighten it securely with a matching nut.
  4. Complete the Connection: Insert a pin or another bolt through the eye to connect the other components, creating the flexible joint.
  5. Regular Inspection: Periodically check the bolt for any damage to the zinc coating, thread wear, or signs of stress. Replace the bolt if any damage is found.