S-94063A544 1/4"-20 x 1 1/4" 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 construction and passivated finish, ideal for harsh industrial environments.
- High tensile strength of 70,000 psi ensures reliable, long-lasting fastening under heavy loads and vibrations.
- Drilled spanner drive design provides secure tool engagement, reducing slippage and damage during installation.
- Fully threaded UNC coarse thread enables faster assembly and stronger holding power in various materials.
- Class 2A thread fit guarantees consistent, precise mating with nuts and tapped holes for smooth assembly.
- Standard flat head profile with 82° countersink allows for flush mounting, minimizing protrusion in finished applications.
- Compliance with ASME B18.6.3, RoHS 3, and REACH ensures adherence to industry standards and environmental safety regulations.
Professional Applications & Engineering Value
This 1/4"-20 UNC flat head screw is engineered to address critical industrial fastening challenges, such as corrosion in humid or chemical-exposed settings. Made from 18-8 stainless steel with a passivated finish, it significantly extends service life by resisting rust and oxidation. The fully threaded coarse thread design enhances grip in soft materials like wood or plastic, while the drilled spanner drive offers reliable torque application without stripping. Ideal for machinery, automotive, and construction applications, it provides a secure, flush fit that maintains structural integrity under stress, reducing maintenance needs and downtime.
Specification Summary & Compliance
This screw features a 1/4"-20 UNC thread with Class 2A thread fit for precise dimensional accuracy, ensuring compatibility with standard components. It meets ASME B18.6.3 specifications for dimensional and mechanical properties, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of hazardous substances for safe use in various industries.
