S-92949A726 1/2"-13 x 3 1/2" ASME B18.3 Stainless Steel Button Head Hex-Drive 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 mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term fastening under high stress.
• Precise, secure thread engagement with Class 3A UNC coarse threads ensuring tight, vibration-resistant connections in demanding applications.
• Efficient installation and removal via a 5/16" hex drive, providing high torque transmission without cam-out for faster assembly.
• Low-profile, rounded button head design minimizes protrusion, reducing snagging risks while maintaining a clean, finished appearance.
• Full threading along the 3 1/2" length allows for maximum adjustability and grip depth in varied material thicknesses.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety, quality, and environmental responsibility.

Professional Applications & Engineering Value

This 1/2"-13 UNC rounded head screw is engineered to solve critical fastening challenges in heavy machinery, structural assemblies, and outdoor equipment. The 18-8 stainless steel material combined with a passivated finish provides excellent resistance to oxidation and chemical exposure, extending service life in corrosive settings. Its coarse UNC threads and Class 3A thread fit deliver superior holding power and rapid installation, reducing the risk of cross-threading in coarse-grained materials. The hex drive ensures reliable torque application, preventing tool slippage during high-stress operations. Ideal for industrial, construction, and marine applications, this screw maintains integrity under dynamic loads and harsh conditions, offering engineers a dependable, specification-compliant fastening solution.

Specification Summary & Compliance

This fastener adheres to precise dimensional standards, including UNC coarse threads with a Class 3A thread fit for tight tolerances and consistent performance. Manufactured in accordance with ASME B18.3 specifications, it ensures interoperability and reliability. The screw is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting environmentally responsible procurement. With a length of 3 1/2", head diameter of 0.875", and full threading, it meets rigorous industrial requirements for strength and durability.