S-90279A535 1/4"-20 x 3/8" ASME B18.6.3 Steel Round Head Phillips Screws
Steel Round 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 zinc plating, extending service life in harsh industrial environments
- High tensile strength of 60,000 psi ensures reliable performance under heavy loads and vibration
- Rockwell B69 hardness provides excellent wear resistance and durability for repeated use
- Class 2A thread fit guarantees smooth installation and secure fastening with standard UNC nuts
- Fully threaded design offers maximum grip and holding power across the entire fastener length
- No. 3 Phillips drive enables efficient installation with common tools while resisting cam-out
- Coarse UNC threading allows for quick assembly and superior performance in wood and metal applications
Professional Applications & Engineering Value
Engineered for demanding industrial assembly and construction applications, these zinc-plated steel rounded head screws solve critical fastening challenges where corrosion resistance and structural integrity are paramount. The combination of 60,000 psi tensile strength and Rockwell B69 hardness ensures these 1/4-20 UNC screws maintain clamping force under dynamic loads and vibration, preventing joint failure in machinery, structural frameworks, and equipment manufacturing. The fully threaded design with coarse spacing provides maximum thread engagement in various materials, while the rounded head profile offers a finished appearance and reduces surface damage. Ideal for metal fabrication, woodworking, and general industrial maintenance where Phillips drive convenience meets heavy-duty performance requirements.
Specification Summary & Compliance
These 1/4-20 x 3/8" rounded head screws feature precise Class 2A thread fit with UNC coarse threading and right-hand direction, manufactured to ASME B18.6.3 specifications for dimensional accuracy and performance consistency. The fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industries and applications.
