S-99926A145 1/4"-20 x 2" Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish for long-lasting performance in harsh industrial environments
• Precise flush mounting enabled by the undercut flat head design with 100° countersink angle for seamless surface integration
• High-reliability fastening through Class 3A thread fit ensuring consistent engagement and vibration resistance
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Efficient installation using 1/8" hex drive that provides secure tool grip and reduces assembly time
• Optimized thread engagement with partially threaded UNC coarse threads for balanced holding power and material savings
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe, environmentally responsible manufacturing

Professional Applications & Engineering Value

These 1/4-20 UNC flat head screws deliver critical engineering solutions where surface flushness and corrosion resistance are paramount. The combination of 18-8 Stainless Steel material and passivated finish provides exceptional protection against chemical exposure and atmospheric corrosion, making them ideal for marine equipment, food processing machinery, and outdoor structural applications. The undercut flat head design with 100° countersink angle ensures complete recessed installation without protrusion, while the Class 3A thread fit maintains precise tolerances for vibration-resistant connections in heavy machinery and transportation equipment. The hex drive configuration allows for high-torque installation in confined spaces, significantly improving assembly efficiency in industrial maintenance and manufacturing operations.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 3A thread fit tolerance and UNC coarse thread profile (1/4"-20). Features include partial threading with minimum 1.86" thread length, 2" overall length, and right-hand thread direction. Mechanical properties include 70,000 psi tensile strength and Rockwell B70 hardness. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for restricted substance control.