Hex Bolt YZP

Product Introduction

• Standard Name: Yellow Zinc Plated Hex Bolt (Blue-White Zinc/Five-Color Zinc Hex Head Bolt).

• Common Names: Color Zinc Hex Bolt, Blue-White Zinc External Hex Screw.

• Product Definition: A bolt featuring a hexagonal head with a blue-white zinc (multicolor zinc) plating finish. This represents an enhanced electroplating process that builds upon basic rust prevention to deliver superior corrosion resistance and a more decorative appearance. It is suitable for mid-to-high-end applications requiring both rust protection and aesthetic appeal.

Hex Bolt YZP Key Features

• Yellow Zinc Plating (YZP): Utilizes a yellow chromate passivation treatment, providing moderate

  corrosion protection (superior to ordinary white zinc). The surface is golden yellow, aesthetically

  pleasing, and wear-resistant, suitable for indoor or slightly humid environments.

• Hexagonal Head Design: Facilitates torque application using wrenches or socket tools, ensuring efficient

  installation and removal.

• Material and Strength: Commonly used carbon steel or alloy steel, strength grades such as 8.8 or 10.9,

  capable of withstanding moderate loads; conforms to standards such as DIN 931 and ISO 4014.

• Various Specifications: Diameters M6-M36, lengths 20mm-300mm, supports full or partial threads.

• Advantages: Good rust resistance, attractive appearance, economical and practical, but not suitable

  for high corrosion or long-term outdoor exposure.

Working Principle

• Thread Matching: The external thread mates with the nut or internal threaded hole. Rotation generates

  axial tensile force, forming a clamping force.

• Load Transfer: When torque is applied, the bolt tensile stress is distributed, and the yellow zinc plating

  reduces friction, improving installation efficiency.

• Corrosion Protection Mechanism: The zinc layer acts as a sacrificial anode for preferential oxidation,

  and chromate passivation enhances corrosion resistance; the principle involves electrochemical

  protection and mechanical friction.

• Installation Control: Using a torque wrench avoids overtightening and damaging the coating, and the

  combination with washers resists loosening due to vibration.

Product Applications

• Machinery Manufacturing: Secures equipment components, machine tools, or conveyor systems;

  the yellow finish enhances product quality.

• Automotive and Electronics: Assembles vehicle frames, engine mounts, or electrical housings; resistant

  to mild corrosion.

• Construction Engineering: Secures interior steel structures or decorations; aesthetically pleasing and

  practical.

• Furniture and DIY: Used for home assembly or plumbing fixation; economical for non-extreme

  environments.

• Industrial Equipment: Used as a standard fastener on production lines or warehouse shelves, balancing

  performance and cost.