S-99926A136 1/4"-20 x 1/2" Stainless Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
• Precise thread engagement with Class 3A fit ensuring reliable, vibration-resistant fastening in critical applications
• Enhanced driving efficiency through hex drive design providing superior torque transmission and reduced cam-out risk
• Optimal flush mounting with undercut flat head profile that seats perfectly without surface protrusion
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for heavy-duty applications
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial use
• Versatile coarse threading with UNC 1/4"-20 pattern enabling quick installation and superior performance in various materials

Professional Applications & Engineering Value

Engineered for demanding industrial environments, these 1/4"-20 UNC flat head screws deliver exceptional performance where reliability matters most. The 18-8 stainless steel construction combined with passivated finish provides outstanding corrosion resistance, making them ideal for machinery, marine equipment, and chemical processing applications. The undercut flat head profile ensures perfect flush mounting in countersunk holes, while the hex drive design allows for high-torque installation without stripping. With Class 3A thread fit and coarse thread spacing, these screws offer superior vibration resistance and quick assembly in metal, plastic, and composite materials, reducing installation time and maintenance requirements in production lines and equipment manufacturing.

Specification Summary & Compliance

This 1/4"-20 UNC flat head screw features precise Class 3A thread fit per Unified Thread Standard specifications, ensuring tight tolerances and reliable performance. The manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making them suitable for global industrial applications. Critical dimensions include 1/2" length, 0.531" head diameter, and 100° countersink angle for proper seating. The partial threading design provides optimal grip length while maintaining structural integrity, with mechanical properties including 70,000 psi tensile strength and Rockwell B70 hardness for consistent performance under load.