S-97654A635 1/4"-28 x 1" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with 18-8 stainless steel construction and passivated finish for long-term reliability in harsh environments
• Superior thread engagement with Class 3A precision fit and UNF fine threading for secure fastening in critical applications
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding load requirements
• Integrated flange design eliminates need for separate washers while providing superior load distribution
• Optimized drive performance with 5/32" hex drive for positive torque transmission and reduced cam-out risk
• Full threading capability ensures maximum grip length and consistent clamping force along the entire fastener
• Regulatory compliance meets RoHS 3 and REACH environmental standards for global manufacturing applications

Professional Applications & Engineering Value

Engineered for precision assembly where corrosion resistance and high tensile strength are critical, these 18-8 stainless steel screws with passivated finish provide exceptional protection against chemical exposure and atmospheric corrosion. The flanged hex drive rounded head design combines installation efficiency with superior bearing surface, making them ideal for electronic enclosures, precision machinery, and automotive components where space constraints and vibration resistance are concerns. The Class 3A UNF fine threads ensure precise fit in tapped holes, reducing the risk of cross-threading while maintaining consistent clamping force in high-vibration environments. The combination of 70,000 psi tensile strength and Rockwell B70 hardness makes these fully threaded screws suitable for applications requiring repeated disassembly and reassembly without thread degradation.

Specification Summary & Compliance

This 1/4"-28 UNF screw features Class 3A thread fit per UNF standards with fine thread spacing for precision applications. Manufacturing complies with industry standards for dimensional accuracy, including 0.25" thread diameter and 1" length with fully threaded construction. The product meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and material safety for global industrial applications.