S-99926A153 5/16"-18 x 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, ideal for harsh industrial environments.
• Exceptional holding power from 70,000 psi tensile strength and Class 3A thread fit, ensuring reliable, vibration-resistant connections.
• Efficient installation and removal using a standard 5/32" hex drive, reducing assembly time and tool slippage.
• Flush, professional finish with an undercut flat head and 100° countersink angle, preventing surface protrusion and snagging.
• Optimized for coarse thread applications with UNC threading, providing faster driving and better performance in softer materials.
• Durable, long-lasting performance backed by Rockwell B70 hardness, resisting wear and deformation under load.
• Compliance with global environmental standards including RoHS 3 and REACH, ensuring safe and sustainable use.

Professional Applications & Engineering Value

Engineered for demanding industrial applications, these 5/16"-18 UNC flat head screws address critical assembly challenges. The 18-8 stainless steel material, combined with a passivated finish, provides excellent resistance to rust and chemical exposure, making them suitable for machinery, outdoor equipment, and marine environments. The undercut flat head profile and 100° countersink angle ensure a secure, flush fit, reducing stress concentrations and improving aerodynamics in assembled structures. With a coarse thread spacing and partial threading, they offer quick installation and strong grip in wood, plastic, or soft metals, minimizing the risk of stripping. The hex drive design allows for high torque application, ensuring tight, reliable fastening in heavy-duty settings where vibration resistance is paramount.

Specification Summary & Compliance

This screw meets UNC coarse thread standards with a Class 3A thread fit for precise, tight-tolerance assembly. Dimensions include a 2" length, 5/16"-18 thread size, and 0.313" thread diameter. It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and compliance in global markets. The manufacturing process adheres to strict quality controls for consistent performance in industrial fastening applications.