S-90287A537 1/4"-20 x 1/2" ASME B18.6.3 Tamper-Resistant One-Way-Drive Steel Round Head Screws
Tamper-Resistant One-Way-Drive 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 with zinc-plated steel construction, extending service life in demanding industrial environments
- High tensile strength of 60,000 psi ensures reliable fastening under significant mechanical stress and vibration
- Class 2A thread fit provides consistent assembly performance and reduces cross-threading risks during installation
- Fully threaded design offers maximum grip length and uniform load distribution across connected materials
- Rockwell B70 hardness maintains thread integrity and prevents stripping during repeated use
- Coarse UNC threading enables faster installation and better performance in softer materials
- One-way drive style enhances security in applications requiring tamper-resistant fastening solutions
Professional Applications & Engineering Value
These 1/4-20 UNC zinc-plated steel rounded head screws deliver exceptional engineering value through their balanced combination of high tensile strength and corrosion-resistant coating. The fully threaded coarse UNC pattern ensures rapid installation while maintaining superior holding power in machinery assemblies, electrical enclosures, and structural frameworks. The rounded head profile with one-way drive provides both aesthetic appeal and tamper-resistant security, making them ideal for permanent installations where maintenance access is limited. Their Rockwell B70 hardness prevents deformation under torque stress, while the zinc plating protects against oxidation in humid or chemically aggressive environments, significantly reducing maintenance frequency and replacement costs in industrial settings.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with Class 2A thread fit tolerance ensuring consistent mating with standard nuts and threaded holes. These screws conform to ASME B18.6.3 mechanical and dimensional specifications, guaranteeing interchangeability and reliable performance. The products are fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations regarding substance restrictions, making them suitable for global industrial supply chains and environmentally conscious manufacturing operations.
