Stainless steel Hexagon socket cheese head Metal shoulder SUS304 SUS316 A2-70 CAPTIVE BOLT

A shoulder bolt, also known as a shoulder screw or stripper bolt, is a type of fastener characterized by a smooth, unthreaded "shoulder" between the head and the threaded portion. The shoulder portion is wider than the threaded section and allows for precise spacing or alignment, making it commonly used in applications where rotational or sliding movement is needed.

Here's a quick breakdown of its key parts:

• Head: Typically larger than standard screws, often with a hex or socket drive.
• Shoulder: The smooth cylindrical section, usually very accurately sized, to allow for a specific amount of movement or spacing.
• Threaded section: Shorter than standard screws, often only occupying the last portion of the bolt's length.

These bolts are commonly used in machinery, automotive parts, and assembly fixtures where components need to move or pivot around the shoulder, such as in pulleys, linkages, or in hinge applications.

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: Keep stainless steel products clean using mild detergents and soft cloth. Avoid acidic and alkaline components to prevent surface damage.
• Stain removal: For stubborn dirt, use special stainless steel stain remover following product instructions. Alcohol or vinegar can also be effective cleaners.

201, 304, 316 are austenitic stainless steel, typically non-magnetic. Some weak magnetic properties may occur due to composition segregation or improper heat treatment. The corrosion resistance comes from chromium oxide protective layer formation on the metal surface.

304 stainless steel: A general-purpose stainless steel widely used for equipment and machine parts requiring good corrosion resistance and formability. Contains more than 18% chromium and 8% nickel.

A2 vs A4 stainless steel: A2 is a class of 304 stainless steel, while A4 is a class of 316 stainless steel. The main difference lies in composition, with 316/316L containing molybdenum for enhanced corrosion resistance.