S-91781A259 10-24 x 3 1/2" ASME B18.6.3 Stainless Steel Slotted Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• High mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable performance under load
• Precise flush mounting with standard flat head profile and 82° countersink angle for seamless surface integration
• Easy installation and removal with slotted drive style and right-hand coarse threading (UNC) for straightforward manual operation
• Optimized thread engagement with Class 2A thread fit ensuring consistent, vibration-resistant connections
• Versatile partial threading allowing unthreaded shank section for precise clamping and alignment applications
• Full regulatory compliance meeting ASME B18.6.3 specifications plus RoHS 3 and REACH environmental standards

Professional Applications & Engineering Value

This 10-24 UNC flat head screw delivers exceptional engineering value across industrial applications where corrosion resistance and mechanical reliability are paramount. The 18-8 stainless steel composition combined with passivated finish provides superior protection against chemical exposure and atmospheric corrosion, making these flat head screws ideal for machinery, marine equipment, and food processing installations. The coarse threading (UNC) ensures rapid assembly in soft materials and worn threads, while the partially threaded design prevents overtightening and maintains precise component alignment. With ASME B18.6.3 compliance, engineers can trust consistent dimensional accuracy and performance in critical fastening applications requiring flush surface mounting.

Specification Summary & Compliance

This 3 1/2" flat head screw features 10-24 UNC coarse threads with Class 2A thread fit tolerance for reliable engagement. Manufacturing complies with ASME B18.6.3 specifications for dimensional consistency. The fastener is RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting current environmental regulations for industrial use. Threading is partially applied with minimum 1 1/2" thread length, and the standard 82° countersink angle ensures proper seating in matched countersunk holes.