S-90275A091 3-48 x 3/16" ASME B18.6.3 Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in demanding industrial environments.
• Superior tensile strength of 60,000 psi provides reliable fastening under high-stress conditions, reducing the risk of mechanical failure.
• Rockwell B70 hardness offers excellent durability and wear resistance, maintaining thread integrity through repeated use.
• Class 2A thread fit with UNC coarse threading ensures easy installation and secure engagement, minimizing cross-threading issues.
• 82° countersink angle with standard flat head profile allows for flush mounting, creating smooth surfaces and improved aesthetics.
• Fully threaded design maximizes grip length and holding power across the entire fastener, enhancing joint stability.
• Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for safe, global use.

Professional Applications & Engineering Value

These 3-48 UNC flat head slotted screws are engineered to address common industrial challenges such as vibration loosening and corrosion-induced failure. The zinc-plated steel material provides a protective barrier against moisture and chemicals, extending service life in machinery, electronics, and automotive assemblies. The coarse UNC thread spacing and Class 2A thread fit facilitate quick, accurate installation with standard tools, reducing assembly time and labor costs. The flat head with 82° countersink ensures a seamless finish, preventing snagging and improving safety in applications where surface smoothness is critical. Ideal for industrial fastening in OEM equipment and maintenance repairs, these screws deliver consistent performance where precision and reliability are paramount.

Specification Summary & Compliance

This screw features a 3-48 UNC thread size with Class 2A thread fit for precise dimensional accuracy and interchangeability. Manufacturing adheres to ASME B18.6.3 specifications, ensuring consistent quality and performance. The product 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 sourcing. Thread direction is right hand with coarse spacing, and the screw is supplied in the inch system for compatibility with standard North American components.