S-97654A629 1/4"-28 x 1/2" Stainless Steel Flanged Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Precise, secure fastening with Class 3A UNF fine threads ensuring tight tolerances and vibration resistance
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Efficient installation with 5/32" hex drive providing positive torque transmission and reduced cam-out
• Enhanced load distribution through wide flanged button head design, minimizing surface damage
• Full threading versatility allowing consistent engagement along the entire 1/2" length
• Regulatory compliance assurance meeting RoHS 3 and REACH environmental standards

Professional Applications & Engineering Value

This 18-8 stainless steel rounded head screw with Class 3A UNF fine threading addresses critical industrial fastening challenges where corrosion resistance and precision are paramount. The passivated finish significantly enhances surface durability against chemical exposure and oxidation in manufacturing, marine, and food processing equipment. Its flanged button head design distributes clamping force over a wider area, preventing material deformation in thin-section assemblies. The hex drive system ensures reliable torque application in confined spaces, while the fully threaded 1/4"-28 configuration maintains consistent grip strength across varying material thicknesses. Engineered for 70,000 psi tensile strength, this component delivers exceptional fatigue resistance in high-vibration environments including machinery, automotive subsystems, and electronic enclosures.

Specification Summary & Compliance

This precision fastener maintains Class 3A thread fit per UNF standards with 1/4"-28 fine threading and 0.25" diameter. Manufacturing conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements. Dimensional specifications include 1/2" length, 0.563" flange diameter, and 0.132" head height with complete threading throughout the shank. Material certification confirms Rockwell B70 hardness and mechanical properties meeting 70,000 psi tensile strength thresholds for industrial duty cycles.