S-91770A537 1/4"-20 x 1/2" ASME B18.6.3 Stainless Steel Truss Head Phillips Screws
Stainless Steel Truss Head Phillips Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Enhanced load distribution from the wide truss head design, reducing surface pressure and material damage
- High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Reliable thread engagement with Class 2A fit and UNC coarse threading, ensuring secure fastening and vibration resistance
- Efficient installation using No. 3 Phillips drive, providing positive torque control and reduced cam-out risk
- Full threading coverage along the 1/2" length for maximum grip and adjustability in assembled components
- Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental directives (RoHS 3, REACH)
Professional Applications & Engineering Value
These 1/4-20 UNC truss head screws deliver exceptional performance in industrial fastening where corrosion resistance and structural integrity are paramount. The passivated 18-8 stainless steel material provides excellent protection against oxidation and chemical exposure, extending service life in manufacturing equipment, outdoor enclosures, and assembly lines. The wide truss head profile distributes clamping force over a larger area, preventing surface deformation on softer materials while the coarse UNC threading ensures rapid installation and superior holding power in wood, plastic, and metal substrates. With fully threaded construction and Class 2A thread fit, these screws maintain consistent engagement depth for vibration-prone applications, making them ideal for machinery, electrical panels, and structural frameworks requiring reliable, long-term fastening solutions.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance and UNC coarse thread spacing (1/4"-20). Complies with ASME B18.6.3 mechanical and dimensional specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards. Features include 0.573" head diameter, No. 3 Phillips drive, and full threading along the 1/2" length.
