S-91781A726 1/2"-13 x 3 1/2" 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 for extended service life in harsh environments.
• High tensile strength of 80,000 psi and Rockwell B80 hardness for reliable performance in demanding structural and industrial applications.
• Precision Class 2A thread fit ensures smooth installation and secure fastening, reducing assembly time and improving joint integrity.
• Partially threaded UNC coarse thread design provides optimal grip and vibration resistance in a wide range of materials.
• Standard 82° countersink angle and flat head profile allows for a flush, clean finish, enhancing safety and aesthetics.
• Slotted drive compatibility offers versatility for use with common hand and power tools, facilitating quick and easy installation.
• Full compliance with ASME B18.6.3, RoHS 3, and REACH guarantees product quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

Engineered for industrial durability, this 1/2"-13 UNC Flat Head Screw in 18-8 Stainless Steel addresses critical challenges in machinery assembly, structural frameworks, and outdoor equipment. The passivated finish significantly enhances corrosion resistance, making it ideal for applications exposed to moisture, chemicals, or extreme temperatures. Its partially threaded coarse UNC thread design ensures strong holding power in wood, metal, and composite materials, while the flat head with 82° countersink provides a secure, flush mount that prevents snagging and maintains surface integrity. This screw delivers reliable tensile strength and consistent performance, reducing maintenance needs and downtime in industrial applications such as conveyor systems, heavy-duty enclosures, and construction projects.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC coarse thread with Class 2A fit for precise dimensional accuracy and easy assembly. It is manufactured in compliance with ASME B18.6.3 standards, ensuring consistent quality and interchangeability. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for use in various industrial and commercial sectors.