DIN 603 Round Head Carriage Bolts Zinc Plated Carbon Steel M3 x 80mm

Product Description

DIN 603 round head carriage bolts are widely used fasteners designed with a smooth mushroom head and a square neck under the head. The square neck helps prevent the bolt from rotating during installation, making it ideal for wood, metal, machinery, furniture, construction, and general assembly applications.

This M3 x 80mm carriage bolt is made from carbon steel and finished with zinc plating, providing improved corrosion resistance, a bright yellow/golden appearance, and better surface protection compared with plain steel. The smooth round head gives the finished assembly a neat and safe appearance, while the full threaded shank allows secure fastening with a matching nut and washer.

These bolts are suitable for both standard stock supply and customized OEM/ODM production according to customer drawings, samples, or special requirements.

Key Features

Product Advantages

1. Smooth Round Head Design

The round mushroom head provides a clean and low-profile appearance after installation. It is safer than sharp-edged fasteners and is suitable for applications where the exposed head should look neat.

2. Square Neck Anti-Rotation Structure

The square neck under the head locks into the material during tightening. This prevents the bolt from spinning, allowing easier installation from one side when used with a nut.

3. Zinc Plated Surface Protection

The zinc plated finish improves corrosion resistance and gives the bolt a bright yellow/gold appearance. It is suitable for indoor and general outdoor applications where moderate corrosion protection is required.

4. Carbon Steel Strength

Carbon steel provides good mechanical strength and cost performance, making this carriage bolt suitable for bulk industrial use, construction, furniture assembly, and general hardware applications.

Technical Specifications

Common Applications

DIN 603 carriage bolts are commonly used in:

Why Choose Our DIN 603 Carriage Bolts?

We supply DIN 603 round head carriage bolts in different sizes, materials, grades, and surface treatments. Standard and customized products are available for wholesale, distribution, project procurement, and OEM applications.

Available options include:

Часто задаваемые вопросы

Q1: What is a DIN 603 carriage bolt?

A DIN 603 carriage bolt is a metric round head bolt with a square neck under the head. The square neck helps prevent rotation when tightening the nut.

Q2: What does M3 x 80mm mean?

M3 means the thread diameter is 3mm, and 80mm means the bolt length is 80mm, usually measured from under the head to the end of the bolt.

Q3: What is the surface treatment of this bolt?

This product is zinc plated, with a yellow/golden zinc appearance. Zinc plating helps improve corrosion resistance and surface durability.

Q4: Can this bolt be used outdoors?

It can be used in general outdoor environments, but for stronger outdoor corrosion resistance, hot dip galvanized or stainless steel is recommended.

Q5: Can you customize the size or surface finish?

Yes. We can customize diameter, length, material, grade, surface treatment, and packaging according to your drawings, samples, or detailed requirements.

Q6: What nuts should be used with this bolt?

It should be used with matching M3 metric nuts. Washers can also be added depending on the application.

Q7: Is this bolt suitable for wood?

Yes. DIN 603 carriage bolts are commonly used in wood structures and furniture because the square neck can lock into the wood and prevent rotation.

Q8: Do you support bulk orders?

Yes. We support bulk orders, wholesale supply, OEM/ODM production, and customized packaging for distributors, importers, and project buyers.