S-92949A835 1/4"-20 x 1 1/8" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel and passivated finish for extended service life in harsh environments.
• High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, durable fastening under stress.
• Precise, secure thread engagement with Class 3A fit and UNC coarse threads, reducing cross-threading risks and ensuring consistent assembly quality.
• Efficient installation and removal via the 5/32" hex drive and rounded button head design, allowing for high-torque application in confined spaces.
• Full threading for maximum grip across the entire 1 1/8" length, providing uniform clamping force and vibration resistance.
• Compliance with stringent industrial standards including ASME B18.3, ensuring dimensional accuracy and interchangeability.
• Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements for hazardous substances.

Professional Applications & Engineering Value

This 1/4-20 UNC Rounded Head Hex Drive Screw is engineered to address critical challenges in industrial assembly, such as vibration loosening and corrosion-induced failure. The 18-8 Stainless Steel construction, enhanced by a passivated finish, provides exceptional resistance to oxidation and chemical exposure, making it ideal for applications in marine, food processing, and outdoor equipment. The coarse UNC thread and Class 3A fit ensure quick, reliable engagement in a variety of materials, reducing installation time and improving joint integrity. With a rounded button head and hex drive, it offers a low-profile, high-torque solution for machinery, enclosures, and structural frameworks where space is limited and durability is paramount.

Specification Summary & Compliance

This screw adheres to Class 3A thread fit and UNC coarse thread standards, ensuring precise dimensional accuracy per ASME B18.3. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances. Manufactured to meet ASTM F879 specifications, it guarantees consistent performance in tensile strength (70,000 psi) and hardness (Rockwell B55) for industrial use.