S-96640A249 1/4"-20 x 2 1/2" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments and outdoor applications.
• High tensile strength of 80,000 psi ensures reliable performance under heavy loads and mechanical stress, reducing failure risks.
• Rockwell B80 hardness provides superior durability and wear resistance, extending service life in demanding conditions.
• Fully threaded design with UNC coarse threads offers faster installation and secure holding power in various materials.
• Standard 82° countersink angle and flat head profile enables flush mounting for a smooth, professional finish and improved safety.
• Phillips No. 3 drive allows for efficient torque application and easy installation with common tools, minimizing assembly time.
• Class 2A thread fit ensures consistent, precise engagement with mating parts, reducing cross-threading and improving reliability.

Professional Applications & Engineering Value

This 1/4"-20 x 2 1/2" flat head screw is engineered to address critical challenges in industrial assembly, such as vibration resistance and environmental exposure. The Black-Oxide 18-8 Stainless Steel construction provides excellent protection against rust and chemical corrosion, making it suitable for machinery, automotive, and construction applications. The UNC coarse threading and fully threaded design enhance grip in softer materials like wood or plastic, while the 82° countersink angle ensures a seamless fit in pre-drilled holes, preventing surface protrusions. With a Phillips drive, it simplifies maintenance and disassembly, reducing downtime in production lines. Ideal for heavy-duty fastening, this screw delivers long-term reliability in high-stress environments, from equipment frames to structural supports.

Specification Summary & Compliance

This screw adheres to ASME B18.6.3 specifications for dimensional accuracy and performance. It features UNC coarse threads with a Class 2A thread fit for standard tolerance, ensuring compatibility with common nuts and threaded holes. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for industrial use. Additional details include a right-hand thread direction, Rockwell B80 hardness, and tensile strength of 80,000 psi, meeting rigorous quality standards for dependable operation.