S-97654A701 1/4"-20 x 3 1/2" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for reliable, heavy-duty load-bearing.
• Precise, secure fastening ensured by Class 3A thread fit and UNC coarse threading, minimizing the risk of cross-threading and loosening.
• Integrated flange design eliminates the need for a separate washer, providing a wider bearing surface and faster installation.
• Full threading along the 3 1/2" length offers maximum grip and holding power across the entire engagement area.
• Easy installation and high torque application enabled by the internal hex drive (5/32") and wide, rounded button head profile.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for global markets.

Professional Applications & Engineering Value

This 1/4"-20 x 3 1/2" flanged hex drive rounded head screw is engineered to solve critical fastening challenges in demanding applications. Its core construction from 18-8 stainless steel with a passivated finish provides excellent resistance to oxidation and chemical exposure, making it a durable choice for machinery, outdoor equipment, and assembly lines. The combination of a Class 3A UNC coarse thread and a fully threaded design ensures rapid assembly and a vibration-resistant hold, reducing maintenance needs. The integrated flange distributes clamping force effectively, preventing surface damage and simplifying inventory. This screw delivers reliable performance in heavy-duty structural frameworks, automotive components, and industrial manufacturing where strength and corrosion resistance are paramount.

Specification Summary & Compliance

This screw adheres to UNC (Unified Coarse) thread standards with a precise Class 3A fit for superior dimensional accuracy and interchangeability. Key dimensional specifications include a 1/4"-20 thread size, 3 1/2" length, and a 0.563" flange diameter. It is manufactured to deliver 70,000 psi tensile strength and Rockwell B70 hardness. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to strict environmental and safety standards for industrial use.