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Stainless Steel Shoulder Bolts Manufacturers

  • shoulder screw
  • shoulder screw
  • shoulder screw
  • shoulder screw
  • shoulder screw
  • shoulder screw
  • shoulder screw

shoulder screw

We can produce shoulder screws in a wide range of types and materials, all supplied with a material report on despatch, they have a small standard shoulder tolerance and are suitable for most machines and equipment. They are commonly used to guide or align components and can also be used as shafts or pivot points.

The unique thing about this shoulder bolt is that it has a flat shoulder. This shoulder design is located between the bolt head and the threads, giving the entire shoulder bolt unique features and advantages during assembly. Its shoulder design Providing a flat, smooth surface that can be used to support and position adjacent parts, this means that during installation, shoulder bolts can ensure that connected parts maintain the correct position and clearance, thereby increasing the accuracy and efficiency of assembly.
TYPE: Inch、Metric、Slotted Head、Hexagonal head... 
MATERIAL: Class 8 Steel、Stainless Steels 303/304/316...
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  • 4000 m²
    Factory Covered
  • 2004
    Found In
  • 50+
    Factory Employees
  • 60+
    Japanese Advanced Equipment
Ningbo Frienden Precision Components Co., Ltd.

Ningbo Frienden Precision Components Co., Ltd.

Frienden is a factory producing auto parts. Focus on the development and production of auto parts such as precision valves and shafts. Custom Class 8 Steel Shoulder Screws Manufacturers and Wholesale Slotted/Hexagon Shoulder Screws Suppliers and Factory. It has a production plant of 4,000 square meters and 50 employees. IATF16949 certification, using ERP system. More than 60 sets of the advanced equipment imported from Japan, including Japan's STAR and Tsugami 5-9 axis walking machines, Citizen lathes, Brother Drilling, Taiwanese machining centers, Taiwanese grinding machines and other advanced equipment. It can provide 200,000 high-pressure fuel pumps per year. With complete product quality inspection and control capabilities, including professional testing equipment such as Zeiss, Mitutoyo, etc., to ensure that we provide customers with high-quality products.

As Custom Stainless Steel Shoulder Screws Factory, We have a young, professional and dedicated R&D, production and sales management team, adhering to the service concept of "integrity, sincerity, and honesty", adhering to the environmental protection spirit of green production and green regeneration. Many high-quality customers have established close cooperation Partnerships.

Plant And Equipment

  • SWISS machining
  • CNC machining center
  • CNC machining center
  • Automaic turning
  • Automaic turning
  • CNC machining center

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Industry Knowledge Extension

How does surface finish affect Stainless Steels shoulder screw corrosion resistance and operverall formance?
The surface finish of stainless steel shoulder screws plays a crucial role in influencing corrosion resistance and overall performance. Here's how surface finish impacts these aspects:
Corrosion Resistance:
A smoother surface finish generally enhances the corrosion resistance of stainless steel. Smooth surfaces have fewer imperfections and crevices where corrosive agents, such as moisture or chemicals, can accumulate.
The removal of surface irregularities during finishing processes reduces the likelihood of corrosion initiation sites, improving the overall resistance of the material to corrosion.
Passivation:
Passivation is a process often used as part of the surface finishing of stainless steel. It involves treating the metal with an acid solution to remove contaminants and enhance the formation of a passive oxide layer on the surface.
Passivation helps improve the corrosion resistance of stainless steel by promoting the development of a stable and protective oxide layer.
Smoothness and Cleanability:
A smoother surface finish facilitates easier cleaning and maintenance of Stainless Steel Slotted Head Shoulder Screws. This is particularly important in applications where cleanliness and hygiene are critical, such as in the food and medical industries.
Smooth surfaces are less likely to trap contaminants, making the components easier to clean and reducing the risk of corrosion caused by the presence of foreign particles.
Aesthetic Considerations:
In some applications, the appearance of the Stainless Steel Slotted Head Shoulder Screws may be important. A high-quality surface finish contributes to an aesthetically pleasing appearance, which can be crucial in consumer-facing products or applications where visual appeal is a factor.
Surface Passivity:
The passivity of the stainless steel surface is crucial for its corrosion resistance. A high-quality surface finish helps maintain and enhance the passive layer on the metal, which acts as a barrier against corrosive agents.
Surface Roughness:
The roughness or smoothness of the surface can impact the ability of corrosive substances to adhere to the material. A smoother surface finish reduces the likelihood of corrosive agents getting trapped in surface irregularities, which can lead to localized corrosion.
Resistance to Pitting and Crevice Corrosion:
Pitting and crevice corrosion are types of corrosion that can occur in localized areas. A smooth surface finish is important in minimizing the risk of these types of corrosion, as it reduces the number of potential sites for corrosion initiation.
Industry Standards:
Certain industries may have specific standards or guidelines for the surface finish of components used in their applications. Adhering to these standards ensures that the components meet the required performance and corrosion resistance criteria.
A high-quality surface finish, which may include passivation and the removal of surface imperfections, is essential for optimizing the corrosion resistance and overall performance of stainless steel shoulder screws. The specific requirements for surface finish depend on the intended application and the environmental conditions the components will be exposed to.


What types of surface finishes or coatings are applied to Class 8 shoulder screws?
Class 8 Slotted Head Shoulder Screws, being high-strength fasteners, may undergo various surface finishes or coatings to enhance their performance, durability, and resistance to corrosion. The specific type of finish or coating applied can depend on the material of the screw, the intended application, and environmental conditions. Here are some common types of surface finishes or coatings for Class 8 Hexagon Head Shoulder Screws:
Zinc Plating:
Description: Zinc plating is a common and cost-effective coating that provides corrosion resistance to the steel shoulder screw. It forms a protective layer that helps prevent oxidation.
Zinc-Nickel Alloy Coating:
Description: Zinc-nickel alloy coatings offer enhanced corrosion resistance compared to standard zinc plating. This alloy provides better protection in harsh environments.
Cadmium Plating:
Description: Cadmium plating provides excellent corrosion resistance and is known for its ability to withstand harsh conditions. However, environmental concerns have led to reduced use in certain applications.
Phosphate and Oil Coating:
Description: Phosphate coatings, often combined with an oil film, provide improved corrosion resistance and act as a lubricant during assembly. This type of coating is commonly used for applications that involve movement.
Black Oxide Coating:
Description: Black oxide is a conversion coating that offers mild corrosion resistance and a decorative black finish. It is often used for aesthetic purposes and provides some protection against rust.
Passivation:
Description: Passivation is a chemical process that removes free iron and other contaminants from the surface of the stainless steel shoulder screw. It enhances the natural corrosion resistance of stainless steel.
Nickel Plating:
Description: Nickel plating provides corrosion resistance and can offer a decorative finish. It is often used in applications where a bright or reflective surface is desired.
Electroless Nickel Plating:
Description: Electroless nickel plating is a process that deposits a uniform layer of nickel on the surface of the shoulder screw. It offers corrosion resistance and uniform coating thickness.
Dacromet Coating:
Description: Dacromet is a coating that provides excellent corrosion resistance, particularly in high-stress and corrosive environments. It is often used in automotive and industrial applications.
Hot-Dip Galvanizing:
Description: Hot-dip galvanizing involves immersing the shoulder screw in molten zinc, creating a thick and durable coating. This coating is highly effective for corrosion protection in various environments.
Xylan Coating:
Description: Xylan coatings are often applied for additional corrosion resistance, reduced friction, and enhanced wear resistance. They are commonly used in critical and high-performance applications.