S-91500A344 1/4"-28 x 3/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance thanks to 316 stainless steel construction, ideal for harsh environments and chemical exposure
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B80 hardness for reliable, long-term fastening
• Precise and secure thread engagement ensured by Class 2A thread fit and fine UNF threading, reducing the risk of stripping
• Enhanced durability and surface protection from the passivated finish, which increases resistance to corrosion and wear
• Flush, low-profile installation with the standard flat head and 82° countersink angle for a smooth, finished appearance
• Broad industrial compliance meeting ASME B18.6.3 specifications, RoHS 3, and REACH regulations for safe, global use
• Efficient installation and removal with the No. 3 Phillips drive, providing a common and accessible driving solution

Professional Applications & Engineering Value

Engineered for demanding industrial settings, this 1/4"-28 UNF Flat Head Phillips screw in 316 Stainless Steel addresses critical challenges like corrosion, vibration loosening, and mechanical stress. The fully threaded design and fine thread spacing offer superior holding power in materials prone to cracking or where precise clamp load is essential. Its passivated finish significantly enhances the innate corrosion resistance of 316 stainless, making it a top choice for marine, chemical processing, and food-grade equipment. The flat head with an 82° countersink allows for seamless integration into assemblies, preventing snagging and maintaining aerodynamic or aesthetic surfaces. By complying with ASME B18.6.3, it guarantees dimensional accuracy and performance reliability, reducing assembly errors and maintenance needs in machinery, enclosures, and structural frameworks.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 2A thread fit for consistent assembly and UNF fine threads (1/4"-28) for enhanced tensile strength. Manufactured in accordance with ASME B18.6.3, it ensures uniformity and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in regulated industries and commitment to environmental standards.