S-91781A595 5/16"-18 x 3" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh environments
• High tensile strength of 80,000 psi ensures reliable load-bearing capacity and joint integrity in demanding applications
• Class 2A thread fit provides consistent, smooth assembly with standard UNC nuts and tapped holes
• Partially threaded design allows for precise clamping force control and reduced thread galling
• 82° countersink angle enables flush mounting for clean, aerodynamic surfaces and safety
• Rockwell B80 hardness offers excellent durability and resistance to wear during installation and service
• Coarse UNC thread spacing facilitates quick assembly and disassembly, even in dirty or debris-prone conditions

Professional Applications & Engineering Value

These 5/16"-18 UNC flat head slotted screws are engineered to address critical fastening challenges in industrial settings. The 18-8 stainless steel material, combined with a passivated finish, provides exceptional resistance to rust and chemical exposure, making them suitable for outdoor equipment, marine hardware, and food processing machinery. The partially threaded configuration ensures that the unthreaded shank bears against the materials, distributing stress evenly and preventing loosening under vibration. With a coarse thread spacing and slotted drive, these screws allow for rapid installation in tight spaces, reducing assembly time while maintaining 80,000 psi tensile strength for structural reliability. Ideal for applications requiring flush surfaces, such as automotive panels or electronic enclosures, they deliver long-term performance without compromising on compliance or safety.

Specification Summary & Compliance

This screw features a 5/16"-18 UNC thread with Class 2A fit for precise dimensional accuracy and interchangeability. It meets ASME B18.6.3 specifications for mechanical and dimensional requirements, ensuring consistent quality. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming adherence to environmental and safety regulations for hazardous substances.