The shoulder bolt (or shoulder screw) is widely used in applications requiring rotation, sliding, or spacing due to its unique structural features. Here are the main applications of shoulder bolts:

• Machinery: Used in mechanical structures that need precise alignment and fixation. The shoulder allows components to slide without interference from threads, commonly found in transmission systems and connecting parts.
• Automotive Industry: Used in vehicle suspension systems, engine components, and braking systems to connect moving parts, such as bushings and bearings, enabling rotational or sliding movement.
• Electronics: Used in applications requiring stable spacing, such as mounting circuit boards and chips, to maintain distance between parts and prevent short circuits or other electrical interference.
• Mold Manufacturing: Applied in mold guiding mechanisms and positioning devices to ensure stable and precise sliding or movement of mold components.
• Furniture and Hardware: Commonly used in hinges and sliding rails where rotation is needed, providing smooth movement and improving the durability and stability of the structure.
• Aerospace: Used in aircraft and spacecraft components to fix parts that rotate or slide, requiring high precision and stability.

Shoulder bolts are widely used across various industries and equipment because they provide precise alignment, spacing, sliding, and rotational functions in specific components.

Basic knowledge of stainless steel: Stainless steel is an alloy material with corrosion resistance, and its main components are an alloy of elements such as iron, chromium and nickel. These elements can effectively resist oxidation and corrosion, so that stainless steel has a high degree of durability and aesthetics.

Maintenance methods:

• Cleaning: Keeping stainless steel products clean is an important part of their maintenance. You can use mild detergents and soft cloth for cleaning, avoid the use of detergents containing acidic and alkaline components, so as not to damage the surface of stainless steel.
• Stain remover: For some stubborn dirt, you can use special stainless steel stain remover for cleaning. But before using it, you should carefully read and follow the instructions in the product manual.

201, 304, 316 are austenitic stainless steel, according to the performance of the non-magnetic, some of the performance of the weak magnetic because of the smelting of the composition of the segregation or improper heat treatment leads to the austenite in a small amount of martensite or ferrite.

304 Stainless Steel: 304 is a general-purpose stainless steel that is widely used to make equipment and machine parts that require good all-round performance (corrosion resistance and formability). In order to maintain the corrosion resistance inherent in stainless steel, the steel must contain more than 18% chromium, more than 8% nickel content. 304 stainless steel is a grade of stainless steel produced according to the American ASTM standard.

A2 vs A4 Stainless Steel: A2 is a class of 304 stainless steel, A4 is a class of 316 stainless steel, the main difference between the two is here, some of the fastener industry will be 302HQ and 304 referred to as: A2, 316 and 316L (C content of carbon C is less than 03% of the stainless steel, you can increase the 'L' logo) called A4.