S-97181A129 1/4"-20 x 1 1/2" ASME B18.6.3 Stainless Steel Pan Head Combination Phillips/Slotted Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction and passivated surface treatment
• Exceptional mechanical durability with 100,000 psi tensile strength and Rockwell B100 hardness for reliable performance under load
• Precise thread engagement ensured by Class 2A fit UNC coarse threading, reducing cross-threading risks in industrial assemblies
• Versatile installation options with combined Phillips/slotted drive (No. 3) and standard pan head profile for flexible tool access
• Full-length threading provides consistent fastening strength across the entire 1-1/2" length for secure connections
• Regulatory compliance assurance meeting ASME B18.6.3 manufacturing standards and environmental regulations (RoHS 3, REACH)
• Optimized head design with 0.492" diameter and rounded pan profile for reduced surface protrusion and improved aesthetics

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this 316 stainless steel pan head screw delivers exceptional performance where corrosion resistance is critical. The passivated finish provides an additional protective layer against chemical exposure, saltwater, and extreme temperatures, making it ideal for marine equipment, chemical processing plants, and food processing machinery. The combination of UNC coarse threading and Class 2A fit ensures rapid installation with reduced galling risk, while the dual Phillips/slotted drive accommodates various tooling systems. With full 1/4-20 threading across its 1-1/2" length, this rounded head screw maintains consistent clamping force in structural assemblies, electrical enclosures, and heavy-duty equipment where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

This industrial fastener features precision UNC 1/4-20 coarse threads with Class 2A tolerance for consistent fitment. Manufacturing complies with ASME B18.6.3 standards for dimensional accuracy and mechanical properties. The screw meets environmental regulations including RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) requirements, ensuring safe use in regulated industries. Material certification confirms 316 stainless steel composition with passivated finish for enhanced corrosion protection.