Non-Standard Round Head With Long Square Screws

Product introduction

This product is a typical non-standard screw with a rounded head for easy positioning and a long square cylinder extending below, which has both fastening and anti-rotation functions. As a special-shaped screw, its structure is integrated and has high strength. It is suitable for automation equipment, furniture hardware, automobiles and other scenarios that have special requirements for connection reliability.

The materials can be carbon steel, stainless steel, alloy steel, etc., and the surface treatment and size can be customized. We focus on providing customized non-standard screw solutions and strictly implement quality control from drawing review to precision processing to ensure that each batch of products accurately matches customer assembly needs. Supports small batch samples and large batch supply, welcome to inquire about drawings.

 

Product design and features

Round head and long square screws are typical non-standard screws. The head adopts an arc-shaped design and a long square columnar structure extends from the bottom. This product breaks through the shape limitations of traditional fasteners and is a representative product among special-shaped screws.

Key features include:

Round head: facilitates positioning during assembly and reduces wear on the installation surface;

Long square shaft: Provides a larger torque transmission area, suitable for scenarios that require anti-rotation or high torsion resistance;

Structural integration: integrally formed, high strength, avoiding the risk of loosening caused by the combination of multiple parts;

Large space for customization: As customized non-standard screws, their length, square dimensions, and head diameter can be adjusted according to customer drawings.

 

Materials and application fields

Round head and long square screws can be made of different materials according to the use environment, mainly including:

Carbon steel (the surface can be galvanized, nickel plated, blackened, etc.)

Stainless steel (304, 316, etc., suitable for corrosive environments)

Alloy steel (high strength requirements)

Non-ferrous metals such as copper and aluminum (conductive or lightweight scenarios)

 

As non-standard screws, its typical application areas include:

Automation equipment: used for sliders, guide rails and other parts that need to be limited and fastened together;

Furniture hardware: such as adjusting feet and special-shaped screws in connectors;

Electronic and communication equipment: anti-rotation fixation in small spaces;

Automobiles and rail transit: used for non-standard connection parts, replacing welding or riveting structures.

 

Quality control and certification system

Since this product is a customized non-standard screw, its production process must strictly implement the customized quality control process:

Drawing review: Conduct structural feasibility analysis on each special-shaped screw before mass production;

Mold and process control: Precision cold heading or CNC turning is used to ensure that there is no stress concentration at the transition between the square section and the round head;

Full size inspection: 100% of key dimensions (square across sides, length, head diameter) or random inspection according to AQL standards;

Performance testing: including hardness, torque, salt spray test, etc., performed according to customer requirements;

Certification system: The company has passed ISO 9001, IATF 16949 (automobile-related) and other system certifications to ensure that each batch of non-standard screws is traceable.

 

Customized services

We focus on providing customers with customized non-standard screw solutions. The customized range of round head and long square screws includes:

Size customization: square length, round head diameter, total length, and thread specifications can be adjusted according to the diagram;

Thread form: full thread, half thread, or special tooth type can be designed;

Head structure: On the basis of the round head, drive modes such as slotted slot, cross slot, and internal hexagon can be added;

Surface treatment: Provide a variety of coatings or passivation treatments according to anti-corrosion or appearance requirements;

Material customization: Select materials according to special requirements such as strength, temperature resistance, and corrosion resistance.

Regardless of small batch samples or large batch supply, quick response can be achieved to ensure that each special-shaped screw can accurately match the actual assembly needs.

 

FAQ

Q: Is this round head with long square screw a standard part?

A: No. It is a non-standard screw. There is no universal standard number on the market and it needs to be customized and produced according to drawings or samples.

 

Q: Why are they called “specially shaped screws”?

A: Because its head is round and the shaft is in the shape of a long square column, it is different from standard shapes such as traditional hexagonal heads and pan heads, and is a typical special-shaped screw.

 

Q: What is the minimum order quantity?

A: As customized non-standard screws, the minimum order quantity depends on the product complexity and craftsmanship. Under normal circumstances, the cold heading process recommends a minimum order of 30,000-50,000 pieces, and CNC processing can support small batch customization of dozens of pieces.

 

Q: How to ensure the matching accuracy between the square section and the mounting hole?

A: We will process according to the fit tolerance provided by the customer, and detect the key dimensions before shipment, and can provide a dimensional report.

 

Q: Can I add a drive slot to the round head?

A: Yes. The round head part can be designed in the form of a straight line, a cross, an inner hexagon, etc., which facilitates installation and disassembly without affecting the positioning function of the square section.

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