Dacromet Disc Head Square Neck Carriage Bolt

Product overview

Dacromet Disc Head Square Neck Carriage Bolt is a high-strength carriage bolt with a Dacromet-coated surface. The product adopts a disk head, square neck and threaded shaft structure: during installation, the square neck is embedded in the square hole of the connector, which can effectively prevent the bolt from rotating, and only one side of the nut is required to tighten the nut to achieve reliable locking. Dacromet coating has a silver-gray matte appearance and has excellent salt spray and corrosion resistance. It is suitable for assembly occasions such as outdoor facilities, mechanical equipment, wooden structures and metal frames.

 

Product features

1. Square neck anti-rotation design: The square neck automatically locks the bolt after being embedded in the square hole to prevent the bolt from rotating during the tightening process, enabling one-sided operation and convenient installation.

2. The disc head has a large bearing surface: the wide and flat disc head fits the connection surface to disperse the clamping pressure, and the concentric processing pattern on the disc surface has both anti-slip and beautiful effects.

3. Dacromet anti-corrosion coating: Dacromet zinc-chromium coating is silver-gray matte, has excellent salt spray and corrosion resistance, and has no risk of hydrogen embrittlement. It is the preferred surface treatment for automobiles and outdoor working conditions.

4. High-quality carbon steel material: Made of high-strength carbon steel, the shaft has a uniform surface, reliable strength, good tensile and shear resistance, and is suitable for long-term load-bearing use.

5. Precision machining: CNC turning forming, complete thread profile, consistent lead, stable dimensional tolerance, and smooth matching with standard nuts.

 

Application areas

Dacromet Disc Head Square Neck Carriage Bolt is widely used in the wooden structure connection of outdoor facilities and garden equipment, metal frame assembly of mechanical equipment, fastening of automobile chassis parts, fastening of buildings and furniture, etc. Any connection parts that need to prevent bolt rotation and achieve unilateral locking are typical applications. They are stable and reliable fasteners in engineering assembly.

 

Instructions for use

1. Inspection preparation: Before use, check whether the square neck, pan head and thread are intact, and confirm that the opening of the connecting piece matches the size of the square neck.

2. Penetration installation: Insert the bolts into the connection holes so that the square neck is completely embedded in the square hole and the pan head fits the load-bearing surface.

3. Place the locking piece: insert the washer on the threaded end and screw on the matching nut.

4. Tighten and fix: Use a torque wrench to tighten the nut to the specified torque to complete the tightening; parts that are repeatedly disassembled and assembled can be retightened regularly.

5. Completion inspection: Confirm that all connection points are tightened in place and there is no looseness or deflection before putting it into use.

 

Maintenance

1. Regular inspection: Regularly check whether the nut is loose and whether the thread is worn, and retighten or replace it in time.

2. Cleaning and anti-rust: Keep the surface of the bolt clean and dry to avoid scratching the Dacromet coating with hard objects; if the coating is damaged, you can reapply anti-rust agent.

3. Torque review: For connection parts that are subject to alternating loads or vibrations, review the torque periodically and keep records.

 

FAQ

Q:What is the function of square neck?

A: After the square neck is embedded in the square hole of the connector, it can prevent the bolt from rotating during the tightening process and achieve unilateral locking without additional fixation on the head side.

 

Q: What is the difference between Dacromet coating and ordinary galvanizing?

A: The salt spray and corrosion resistance of Dacromet coating is significantly better than that of ordinary electro-galvanizing, and there is almost no risk of hydrogen embrittlement. At the same time, it has a silver-gray matte appearance, which is more suitable for outdoor and automotive occasions with high anti-corrosion requirements.

 

Q: Is this bolt suitable for joining wood?

A: Suitable. The square neck can be embedded into wooden parts to prevent rotation, and the round head provides a large bearing surface. It is a commonly used connection fastener for wooden structures and outdoor wooden facilities.

 

Q: How to ensure the connection strength?

A: Please use a torque wrench to tighten according to the specified torque to ensure that the square neck is fully fitted and the pan head fits smoothly. Under vibration conditions, it is recommended to install a spring washer and retighten it regularly.

 

Q: Can it be customized to non-standard sizes? 

A: Yes, OEM/ODM customization is supported. Pan head diameter, square neck size, thread length, material and surface treatment can all be customized according to drawings.

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