DIN 603 Mushroom Head Carriage Bolts – Zinc Plated Carbon Steel Round Head Square Neck Bolts

Product Description

DIN 603 Mushroom Head Carriage Bolts are high-strength fastening components designed with a smooth round 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, steel structures, machinery, construction, furniture, guardrails, and general industrial fastening applications.

Made from carbon steel and finished with zinc plating, these carriage bolts offer reliable strength, corrosion resistance, and a clean silver appearance. The smooth mushroom head provides a neat surface finish and reduces the risk of snagging, making it suitable for exposed fastening positions.

These bolts are commonly used together with hex nuts and washers to create a strong and secure connection.

Product Specifications

Key Features

Applications

DIN 603 mushroom head carriage bolts are widely used in:

Material and Surface Finish Options

For outdoor or humid environments, hot dip galvanized or stainless steel material can be recommended depending on the application.

Why Choose Our DIN 603 Carriage Bolts?

Our DIN 603 carriage bolts are manufactured with controlled dimensions, smooth threads, and stable surface treatment. We support standard sizes and customized production according to drawings, samples, or specific project requirements.

We can provide bulk supply, OEM packaging, mixed-size orders, and export-ready cartons or pallets for global B2B customers.

FAQ

1. What is a DIN 603 carriage bolt?

DIN 603 is a standard for mushroom head square neck bolts. The bolt has a round smooth head and a square neck under the head, which helps prevent rotation during installation.

2. What is the advantage of the square neck?

The square neck locks into wood or pre-formed square holes, preventing the bolt from spinning when the nut is tightened.

3. What material are these carriage bolts made of?

This product is made of carbon steel. Stainless steel and higher strength grades can also be customized.

4. What does zinc plated mean?

Zinc plating is a surface treatment that gives the bolt a silver appearance and improves corrosion resistance for general indoor and light outdoor use.

5. Can you provide matching nuts and washers?

Yes. We can supply carriage bolts together with hex nuts, flat washers, spring washers, or customized fastener kits.

6. Can the size be customized?

Yes. Diameter, length, thread length, surface finish, grade, and packaging can be customized according to your requirements.

7. What information is needed for quotation?

Please provide the size, length, material, surface finish, quantity, packaging requirement, and destination port or delivery address. If you have drawings or samples, they will help us quote more accurately.