1/4"-20 18-8 Stainless Steel Hex Nut

Fractional Sizes of 18-8 Stainless Steel Finish Hex Head Nuts

Specifications and Common Applications

18-8 stainless steel finish hex head nuts are a trusted fastening solution across industrial, commercial, and construction markets. Known for their excellent corrosion resistance, strength, and versatility, these nuts perform reliably in environments where moisture, chemicals, or temperature fluctuations are present. Manufactured in fractional (inch) sizes, they are designed to pair seamlessly with standard UNC threaded bolts and studs.

Common Fractional Sizes and Uses

Designed for Standard UNC Fastening

18-8 stainless steel finish hex head nuts are available in a wide range of fractional sizes to meet diverse fastening requirements. Common sizes include:

• 1/4″-20

• 5/16″-18

• 3/8″-16

• 1/2″-13

• 5/8″-11

• 3/4″-10

Each size is defined by the bolt diameter and threads per inch (TPI). For example, a 3/8″-16 nut fits a 3/8-inch diameter bolt with 16 threads per inch. This standardized sizing ensures proper thread engagement, consistent torque, and secure fastening across applications.

These sizes are widely used in construction assemblies, automotive components, marine hardware, and general industrial equipment where reliability is critical.

Material and Technical Specifications

Proven Stainless Steel Performance

18-8 stainless steel—also referred to as A2 stainless steel—contains approximately 18% chromium and 8% nickel, providing strong resistance to rust, oxidation, and many chemicals.

Key specifications include:

• Material: 18-8 (A2) Stainless Steel

• Thread Type: Unified National Coarse (UNC)

• Finish: Plain, uncoated for clean appearance and easy installation

• Strength: Suitable for moderate to high-load applications

• Standards: Commonly manufactured to ASTM A194 and ANSI B18.2.2

Reliable Performance Across Industries

Fractional 18-8 stainless steel finish hex head nuts are ideal for indoor and outdoor applications requiring long-term durability without protective coatings. Their balance of strength and corrosion resistance makes them a dependable choice for structural, mechanical, and marine fastening projects.