Hexagon Nut With Large Flat Washer And Tail Bolt

Product introduction

This product is an innovative combination fastener that integrates an external hex head, a large flat pad and a bundle tail structure. Among them, the large flat pad can effectively increase the force-bearing area and protect the surface of the workpiece; the tail design has a self-locking and anti-loosening function to improve connection reliability. As a typical customized non-standard screw, we break through the limitations of standard parts and can adjust the head height, flat pad diameter and bundle tail length according to customer needs. The products are made of high-quality materials such as carbon steel, alloy steel or 304 stainless steel, and undergo full-process cold heading forming and heat treatment processes to ensure stable mechanical properties. This special shape of screws is widely used in the fields of automobiles, photovoltaics and machinery manufacturing. It can not only meet the anti-loosening requirements of complex working conditions, but also provide customized non-standard screw services according to drawings to provide you with precise fastening and connection solutions.

 

Product design and features

Integrated design: The external hexagonal bolts and large flat washers are combined into one, which effectively prevents the washers from falling off or being lost during installation and improves assembly efficiency. The design of the large flat pad can significantly increase the force-bearing area, protect the surface of the workpiece, and prevent dents or damage caused by excessive pressure during locking.

Beam tail structure: This is the core design highlight of this product. The tail is specially closed (necked or deformed) to make it self-locking, anti-loosening or guiding. Especially when paired with nylon lock nuts or specific riveting processes, it can provide excellent anti-vibration and anti-loosening properties.

Non-standard customization capabilities: We know that standard parts cannot meet all complex working conditions. Therefore, this bolt is a typical custom-made non-standard screw. We can adjust the head height, flat pad diameter, bundle tail length and angle according to the customer's assembly space, force requirements and special functions to achieve true on-demand design.

 

Materials and application fields

Carbon steel series: Usually grade 10.9 or grade 8.8 alloy steel is used. It has high strength after heat treatment. The surface can be galvanized, Dacromet or Jumet to meet different salt spray test time requirements.

Stainless steel series: Made of 304 or 316 stainless steel, it has excellent corrosion resistance and is suitable for chemical industry, marine engineering and outdoor facilities.

Special materials: For specific needs, we can also provide special-shaped screws made of copper, aluminum, titanium alloy, etc.

 

Application areas:

This external hexagonal tail bolt with large flat pad is widely used in:

Automobile industry: Chassis suspension, engine bracket, interior fastening, using its anti-loosening properties to ensure driving safety.

Photovoltaic new energy: The connection of the photovoltaic bracket system, the large flat pad protects the anodized layer, and the bundle tail facilitates quick positioning and installation.

Machinery manufacturing: The vibration parts of agricultural machinery and engineering machinery can effectively resist loosening.

Home Appliances and Electronics: Where it is necessary to provide stable connection points embedded in plastic parts or sheets.

 

Quality control and certification system

Source control: All raw materials (wires) come with original material certificates and undergo strict chemical composition analysis after entering the factory.

Process control: A multi-station cold heading machine is used for one-time molding to ensure that the hexagonal head is full and there are no cracks in the joint between the flat pad and the screw. The tailing process is fully inspected by a high-precision optical image screening machine to ensure that the dimensional tolerance is within the requirements of the drawing.

Performance testing: The laboratory is equipped with Vickers hardness tester, universal material testing machine, salt spray test chamber and torque tester. Each batch of products undergoes hardness, tensile strength and salt spray testing to ensure that the mechanical performance level meets the standards.

Certification system: The company has passed ISO 9001 quality management system certification and IATF 16949 automotive industry quality management system certification to ensure the stability and traceability of the production process.

 

Customized services

Size customization: Diameters range from M3 to M20, and lengths are arbitrary. The tail length and closing diameter can be accurately designed according to the thickness of the customer's workpiece.

Customization of head shape and groove type: In addition to standard external hexagon, flange surface, internal hexagon or special-shaped head shape can be customized.

Customized flat pad specifications: The outer diameter and thickness of the flat pad can be designed to suit the softness and hardness of the workpiece or the size of the opening.

Customized tail shape: In addition to conventional bundled tails, we can also customize screws with special shapes such as cut tails, knurled tails, and pitted tails to meet riveting or anti-rotation needs.

Surface treatment customization: Provide environmentally friendly colored zinc, black zinc, hot-dip galvanizing, Teflon coating and other treatment solutions.

 

FAQ

Q: Why is it called "customized non-standard screws"? What is the difference between it and standard external hexagonal screws?

A: Standard screws have fixed pitch, head thickness and length specifications. Our products are customized non-standard screws, because their "beam tail" structure and "large flat pad" size are often specially designed and produced according to the mounting hole depth, plate thickness or anti-loosening requirements of the customer's specific tooling, and it is impossible to directly find an exact match in stock in the standard parts library.

 

Q: What is the main function of the tail? What precautions should be taken during installation?

A: The main function of the tail is to prevent loosening and guide. It can make the screws easier to install and then harder to install, or it can play a locking role through deformation after passing through the through hole. Please pay attention to using a matching socket or wrench when installing, and ensure that the installation torque is within the recommended range to avoid damaging the tail structure.

 

Q: How to ensure that the large flat pad will not fall off or rotate during transportation and use?

A: Our products fix the large flat washer on the screw through a pressure riveting process or a strong combination process. This ensures that the gasket can rotate freely on the screw (for ease of assembly), but will not fall off from the axis, completely solving the problem of gaskets falling off on site.

 

Q: What is the minimum order quantity (MOQ) for this special shape screw?

A: Since the screws are of special shape and involve mold adjustment and customization, there are usually minimum order quantity requirements. Depending on the diameter and complexity, the minimum order quantity generally ranges from a few thousand to tens of thousands of pieces. However, we can provide small batch sample services for sample testing or research and development stages.

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