S-91355A180 1/4"-20 x 1 1/2" Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Crafted from black-oxide alloy steel with a Rockwell C32 hardness to withstand high-stress applications and resist wear over time.
• Superior Tensile Strength: Offers a 120,000 psi tensile strength, ensuring reliable performance in demanding industrial and heavy-duty assemblies.
• Enhanced Corrosion Resistance: The black-oxide finish provides a protective layer, reducing the risk of rust and extending the screw's service life in harsh environments.
• Precise Thread Fit: Class 3A UNC coarse threading ensures tight, secure fastening with minimal risk of loosening, improving assembly integrity.
• Efficient Installation: Hex drive design (5/32") allows for quick and easy installation with standard tools, reducing labor time and increasing productivity.
• Integrated Flange Design: The flanged, rounded button head distributes clamping force evenly, providing a secure hold without the need for separate washers.
• Full Threading for Maximum Grip: Fully threaded shank ensures consistent engagement along the entire length, enhancing load distribution and fastening reliability.

Professional Applications & Engineering Value

This 1/4"-20 x 1-1/2" rounded head screw is engineered to address common industrial challenges, such as vibration-induced loosening and corrosion in demanding environments. The black-oxide alloy steel construction, combined with UNC coarse threading and Class 3A thread fit, delivers precise, high-strength fastening for machinery, automotive, and structural assemblies. Its flanged design eliminates the need for additional washers, streamlining installation while providing uniform load distribution. Ideal for applications requiring heavy-duty fasteners with superior corrosion resistance, this screw ensures long-term reliability and reduces maintenance costs in sectors like manufacturing, construction, and equipment repair.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a precise Class 3A thread fit for optimal tolerance. Dimensions include a 1/4"-20 thread size, 1-1/2" length, and 0.563" flange diameter. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial use.