S-91781A648 3/8"-16 x 6" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
• High tensile strength of 80,000 psi provides secure, vibration-resistant fastening for demanding industrial applications.
• Partially threaded design allows for precise clamping force control and reduced risk of cross-threading during assembly.
• Standard 82° countersink angle and flat head ensures a flush, clean finish that minimizes protrusion and improves safety.
• Coarse UNC threading and Class 2A fit enable quick installation and reliable performance in a wide range of materials.
• Slotted drive compatibility offers versatility for use with common hand and power tools, simplifying maintenance.
• Full compliance with ASME B18.6.3, RoHS 3, and REACH guarantees consistent quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This 3/8"-16 UNC flat head screw is engineered to address common industrial fastening challenges, such as vibration loosening and material fatigue. The 18-8 stainless steel material, combined with a passivated finish, provides superior resistance to rust and chemical exposure, making it ideal for outdoor machinery, marine equipment, and food processing applications. Its partially threaded configuration ensures that unthreaded shank sections bear load efficiently, reducing stress concentration and enhancing joint integrity. The coarse thread design allows for faster installation in soft metals or plastics, while the flat head with 82° countersink creates a smooth surface to prevent snagging and improve aerodynamic or aesthetic profiles. These features make it a reliable choice for assembly lines, structural frameworks, and heavy-duty enclosures where durability and compliance are critical.

Specification Summary & Compliance

This screw adheres to Class 2A thread fit for consistent engagement and ease of assembly, with UNC coarse threading (3/8"-16) per standard inch system requirements. Manufacturing and dimensional accuracy comply with ASME B18.6.3 specifications. The product is verified to be RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets strict environmental and safety regulations for hazardous substances.