S-91770A551 1/4"-20 x 2 1/4" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance from passivated 18-8 stainless steel construction, ensuring long-term reliability in harsh environments
• Enhanced load distribution with wide truss head design that reduces surface pressure and prevents material damage
• High-strength performance delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
• Quick installation efficiency through No. 3 Phillips drive and coarse UNC threading that reduces assembly time
• Secure thread engagement with Class 2A fit providing consistent fastening without cross-threading risks
• Optimized partial threading allowing unthreaded shank sections for precise clamping control
• Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

These 1/4-20 UNC coarse thread screws with rounded truss head design solve critical industrial fastening challenges where vibration resistance and surface protection are paramount. The passivated 18-8 stainless steel construction provides exceptional corrosion resistance for outdoor equipment, marine applications, and chemical processing environments. The wide truss head profile distributes clamping force over a larger area, preventing damage to soft materials while the partial threading allows for precise grip length control in assembly operations. The No. 3 Phillips drive ensures compatibility with standard industrial tools, making these industrial screws ideal for machinery assembly, electrical enclosures, and structural frameworks requiring ASME B18.6.3 compliance.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent performance. The 1/4"-20 UNC coarse thread configuration ensures reliable engagement while the 2-1/4" length with partial threading provides versatile fastening solutions. These screws conform to ASME B18.6.3 manufacturing specifications and meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, making them suitable for global industrial applications demanding both mechanical performance and regulatory adherence.