S-92949A562 1/4"-28 x 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 for extended service life in harsh environments
• Precise thread engagement with Class 3A UNF fine threading ensures secure fastening and vibration resistance
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
• Easy installation and removal with 5/32" hex drive design providing reliable torque transmission
• Full regulatory compliance meeting ASME B18.3 standards and environmental regulations including RoHS 3 and REACH
• Space-efficient design with rounded button head profile offering a low-profile finish without sacrificing strength
• Complete thread coverage with fully threaded shank for maximum grip length and holding power

Professional Applications & Engineering Value

These 1/4"-28 UNF Class 3A rounded head screws deliver exceptional engineering value in precision assembly applications where corrosion resistance and high tensile strength are critical. The 18-8 stainless steel construction with passivated finish provides superior protection against chemical exposure and environmental factors, making them ideal for marine, chemical processing, and outdoor equipment applications. The fine UNF threading and Class 3A fit ensure precise alignment and secure fastening in machinery, electronic enclosures, and precision instruments where vibration resistance is essential. The combination of hex drive design and rounded button head allows for efficient installation in confined spaces while maintaining a clean, professional appearance.

Specification Summary & Compliance

Manufactured to exacting ASME B18.3 specifications with precision Class 3A thread fit and UNF fine threading standards. These fasteners maintain dimensional accuracy with 1/4"-28 thread size and 1/2" length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures safe use across various industrial sectors. The passivated surface treatment enhances corrosion resistance while maintaining the material's inherent strength characteristics.