M8 Shoulder Metal Bolt Stainless Steel Precision Shoulder Screws Heavy Duty

Shoulder bolts, also known as shoulder screws, are essential fasteners that ensure stable spacing, smooth sliding, or rotational motion in many fields.

British Standard Thread Designation Method:
(e.g.: 3/16-32 UNF-1B)
3/16 denotes the major diameter (outer diameter) of the thread, measured in inches (1 inch = 25.4 mm)
32 indicates 32 threads per inch, specifying the pitch
UNF denotes United Fine Thread, a British fine-pitch thread; UNC denotes United Coarse Thread, where 'C' signifies coarse pitch.
1B indicates the tolerance grade, with analogous grades including 2A, 3A, etc.
For example: 3/16-32
This denotes 32 threads per inch. Since 1 inch equals 25.4 mm, the pitch is 25.4/32. The outer diameter is calculated as 25.4/16 × 3.

• Machinery: Vital in components requiring precise alignment, such as sliding parts in transmission systems where shoulder bolts prevent interference from threads.
• Automotive: Frequently used in suspension, engine, and braking systems to connect bushings and bearings, allowing parts to move freely.
• Electronics: Crucial for maintaining spacing between circuit boards and chips, preventing electrical issues while stabilizing components.
• Mold Manufacturing: Ensures smooth sliding in guiding mechanisms, improving precision and extending mold life.
• Furniture Hardware: Applied in hinges and rails to control movement in furniture, ensuring long-lasting durability.
• Aerospace: Used in aerospace components where high precision and stability are critical for positioning parts.
• Industrial Automation: Used in robotics and conveyor systems to ensure alignment and smooth operation.
• Medical Equipment: Ensures smooth movement in devices with adjustable parts, improving accuracy and longevity.
• Tooling & Fixtures: Important in maintaining fixed alignment and spacing for precision manufacturing.
• Construction & Heavy Equipment: Provides stable movement in structural components, improving equipment performance under heavy loads.

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 effectively resist oxidation and corrosion, giving stainless steel high durability and aesthetic qualities.

• Cleaning: Use mild detergents and soft cloth for cleaning. 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. Austenitic stainless steel corrosion resistance comes from chromium oxide protective layers on the metal surface.

Note: At temperatures between 450°C-900°C, structural changes can reduce corrosion resistance (intergranular corrosion). Low-carbon variants (304L, 316L) minimize this effect.

304 is a general-purpose stainless steel widely used for equipment and machine parts requiring good corrosion resistance and formability. It contains more than 18% chromium and 8% nickel. 304 stainless steel is produced according to the American ASTM standard.

A2 is a class of 304 stainless steel, while A4 is a class of 316 stainless steel. In the fastener industry, 302HQ and 304 are often referred to as A2, while 316 and 316L (with carbon content below 0.03%) are called A4.