S-90909A536 3/8"-16 x 1 1/2" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 Stainless Steel construction and passivated finish, ideal for harsh chemical and marine environments.
• Exceptional mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance under high stress.
• Precise and secure fastening with Class 3A thread fit and UNC coarse threading, ensuring minimal backlash and vibration resistance.
• Integrated flange design on the rounded button head eliminates the need for a separate washer, providing a larger bearing surface and simplified assembly.
• Efficient installation and removal using a standard 7/32" hex drive, allowing for high torque application with common tools.
• Full threading along the 1-1/2" length for maximum grip and adjustability in a wide range of material thicknesses.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global industrial supply chains.

Professional Applications & Engineering Value

This 3/8"-16 UNC flanged rounded head screw is engineered to solve critical challenges in demanding industrial applications. The core value lies in its 316 Stainless Steel material, which provides outstanding resistance to corrosion from chlorides and acidic environments, making it a top choice for chemical processing, marine equipment, and food-grade machinery. The flanged button head design distributes clamping force effectively, preventing surface damage and compensating for oversized or misaligned holes, which streamlines assembly. Combined with a passivated finish that enhances surface durability and a coarse UNC thread that resists loosening in high-vibration settings, this hex drive screw delivers long-term reliability and reduces maintenance cycles in heavy-duty frameworks and structural fastening.

Specification Summary & Compliance

This screw adheres to UNC (Unified Coarse) thread standards with a Class 3A thread fit for high precision and strength. Key dimensional specifications include a 3/8"-16 thread size, 1-1/2" length, and a 0.813" flange diameter. It is fully threaded and manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for regulated industrial and international markets.