S-91781A092 3-48 x 1/4" 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 industrial environments
• Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
• Precision thread engagement through Class 2A thread fit and UNC coarse threading, ensuring secure fastening in various materials
• Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
• Full-threaded reliability across the entire 1/4" length, providing maximum grip and vibration resistance
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and interchangeability
• Environmental regulation adherence with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these 3-48 UNC flat head slotted screws deliver critical performance advantages where corrosion resistance and mechanical reliability are paramount. The combination of 18-8 stainless steel material and passivated finish provides exceptional protection against oxidation and chemical exposure in manufacturing, electronics, and marine environments. The fully threaded right-hand coarse spacing design ensures rapid installation and superior holding power in metals, plastics, and composite materials. The standard 82° countersink angle enables perfect flush mounting in precision assemblies, while the slotted drive style offers compatibility with traditional installation tools. These machine screws solve common engineering challenges including vibration loosening, material compatibility issues, and regulatory compliance requirements.

Specification Summary & Compliance

This flat head screw maintains precise Class 2A thread fit per UNC standards with 3-48 thread size and coarse thread spacing. Manufacturing adheres to ASME B18.6.3 specifications for dimensional accuracy and performance consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Critical dimensions include 1/4" length, 0.187" head diameter, and 0.059" head height for standardized installation.