S-91858A716 1/2"-13 x 1 1/2" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and passivated finish for extended service life in harsh environments
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable performance under heavy loads
• Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
• Streamlined installation featuring standard 82° countersink angle and slotted drive for flush mounting and easy assembly
• Full thread coverage along the 1½" length provides maximum grip strength and load distribution
• Regulatory compliance with ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH
• Versatile industrial application with right-hand thread direction and 0.5" thread diameter suitable for various machinery and equipment

Professional Applications & Engineering Value

These 1/2"-13 UNC flat head screws deliver critical engineering solutions where corrosion resistance and structural integrity are paramount. The 316 stainless steel composition, enhanced by passivated finish, provides exceptional protection against chemical exposure and saltwater environments, making them ideal for marine equipment, chemical processing plants, and food processing machinery. The fully threaded design ensures maximum contact surface area, distributing stress evenly and preventing loosening under vibration - a common failure point in industrial applications. With their standard 82° countersink angle and slotted drive, these screws sit flush with surfaces while allowing straightforward installation and removal. The coarse UNC thread pattern combined with Class 2A fit provides reliable engagement in both metals and plastics, reducing installation time while maintaining precision alignment in assembly operations.

Specification Summary & Compliance

These flat head screws maintain Class 2A thread fit tolerance per UNC standards with precise dimensional control including 0.5" thread diameter and 1½" length. Manufacturing strictly adheres to ASME B18.6.3 specifications governing dimensional requirements and mechanical properties. Environmental compliance is verified through RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring restricted substance management. The mechanical performance is validated by 70,000 psi tensile strength and Rockwell B80 hardness testing, confirming reliability for industrial fastening applications.