S-94063A069 4-40 x 1/2" ASME B18.6.3 Tamper-Resistant Drilled Spanner Flat Head Screws
Tamper-Resistant Drilled Spanner Flat 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 with 18-8 Stainless Steel and passivated finish, ideal for harsh environments and long-term reliability.
- High-strength performance offering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications.
- Precise, secure fastening ensured by Class 2A thread fit and UNC coarse threads, reducing cross-threading risks.
- Flush, unobtrusive installation with a standard 82° countersink angle flat head, maintaining a smooth surface profile.
- Tamper-resistant and specialized drive via the drilled spanner design, enhancing security in controlled-access assemblies.
- Full thread engagement along the entire 1/2" length, providing maximum grip and load distribution.
- Regulatory compliance and quality assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial use.
Professional Applications & Engineering Value
These 4-40 UNC Flat Head Spanner Screws are engineered to address critical challenges in precision assemblies, such as electronics, aerospace components, and machinery where corrosion resistance and tamper-proof security are paramount. The 18-8 Stainless Steel construction, combined with a passivated finish, provides exceptional durability against moisture and chemicals, reducing maintenance costs. The drilled spanner drive offers a specialized, low-profile fastening solution that prevents unauthorized access, while the Class 2A thread fit and coarse UNC threading ensure quick, reliable installation without stripping. Ideal for applications requiring flush mounting and high tensile strength, these screws deliver consistent performance in regulated industries, minimizing downtime and enhancing assembly integrity.
Specification Summary & Compliance
This screw features a 4-40 UNC thread size with Class 2A thread fit for precise dimensional accuracy, and a standard 82° countersink angle for seamless integration. Manufactured in compliance with ASME B18.6.3 specifications, it ensures consistent quality and interchangeability. Additionally, the product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to environmental and safety regulations for industrial use.
