S-91255A144 6-32 x 1/4" ASME B18.3 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure in demanding applications.
• Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in critical assemblies.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance and a durable, non-reflective surface ideal for industrial environments.
• Fully threaded design allows for maximum grip and uniform load distribution along the entire length, improving joint integrity.
• Hex drive (5/64") with rounded button head enables easy installation in confined spaces while providing a low-profile, snag-resistant finish.
• Coarse UNC threading facilitates quick assembly and disassembly, reducing installation time and labor costs.
• Compliance with ASME B18.3 and ASTM F835 ensures consistent quality and interchangeability, supporting standardized procurement and inventory management.

Professional Applications & Engineering Value

These 6-32 UNC Class 3A screws are engineered to address common industrial challenges such as vibration-induced loosening and corrosion in harsh environments. The Black-Oxide Alloy Steel construction, combined with a rounded head and hex drive, provides a robust solution for machinery, electronics, and automotive assemblies where space constraints and durability are critical. The coarse thread and fully threaded design ensure rapid installation and secure fastening, reducing maintenance downtime. Ideal for OEM and MRO applications, these screws deliver consistent performance in high-tensile scenarios, backed by rigorous material hardness (Rockwell C39) to withstand repetitive stress without deformation.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threading with right-hand direction. Manufactured in compliance with ASME B18.3 and ASTM F835 specifications, it meets industry requirements for mechanical properties and performance. Additionally, it is certified RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and regulatory adherence for global supply chains.