S-91770A550 1/4"-20 x 2" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
• Exceptional load-bearing capacity with 70,000 psi tensile strength and Rockwell B70 hardness for reliable performance
• Enhanced surface contact and vibration resistance from the wide truss head design
• Quick installation and high torque transfer with Phillips No. 3 drive and UNC coarse threading
• Consistent thread engagement through full threading and Class 2A thread fit for precise assembly
• Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental RoHS/REACH requirements
• Versatile 2" length providing ample fastening depth for various material thicknesses

Professional Applications & Engineering Value

This 1/4-20 x 2" passivated stainless steel rounded truss head screw delivers critical engineering solutions where corrosion resistance and structural integrity are paramount. The 18-8 stainless steel composition, enhanced by passivation, provides exceptional protection against oxidation and chemical exposure in demanding environments like marine equipment, food processing machinery, and outdoor structures. The wide truss head design distributes clamping force over a larger surface area, reducing material stress and preventing loosening under vibration – a common challenge in industrial assembly. Combined with UNC coarse threading and full thread coverage, these screws ensure rapid installation and reliable performance in wood, metal, and composite applications where high-strength fastening is essential for operational safety and longevity.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit and UNC 1/4-20 coarse threading, this fastener guarantees consistent performance across applications. The screw conforms to ASME B18.6.3 specifications for mechanical and dimensional requirements, ensuring interchangeability and reliability. Environmental compliance is maintained through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) adherence, confirming the absence of restricted substances for global market acceptance.