S-90288A110 4-40 x 1/2" ASME B18.6.3 Tamper-Resistant One-Way-Drive Stainless Steel Round Head Screws
Tamper-Resistant One-Way-Drive Stainless Steel Round Head 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 from 18-8 stainless steel construction, ideal for harsh environments and long-term reliability
- Enhanced durability and surface protection with passivated finish, extending service life and preventing galling
- High mechanical strength with 80,000 psi tensile strength and Rockwell B96 hardness for demanding load applications
- Reliable, quick assembly with coarse UNC threads and Class 2A fit, ensuring consistent engagement and reduced cross-threading risk
- Secure tamper-resistant fastening featuring one-way drive and rounded head design for permanent installations
- Full thread coverage along the 1/2" length for maximum grip and uniform stress distribution
- Compliance with major industry standards including ASME B18.6.3, RoHS 3, and REACH for guaranteed quality and safety
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these 4-40 UNC rounded head screws provide exceptional corrosion resistance and mechanical integrity. The 18-8 stainless steel material, combined with a passivated finish, effectively resists oxidation and chemical exposure, making them ideal for outdoor equipment, marine hardware, and chemical processing applications. The coarse thread design and Class 2A thread fit ensure rapid installation and reliable performance in high-vibration settings, while the one-way drive and rounded head offer tamper-proof security for permanent assemblies. These features collectively address common challenges like fastener failure, maintenance costs, and compliance requirements in industrial fastening systems.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit per Unified National Coarse (UNC) standards, ensuring precise dimensional accuracy and interchangeability. Manufacturing and quality are governed by ASME B18.6.3 specifications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances and supporting environmental and workplace safety protocols.
