S-90276A571 1/4"-20 x 3 1/2" ASME B18.6.3 Steel Round Head Slotted Screws
Steel Round Head Slotted 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
- Exceptional load-bearing capacity with 60,000 psi tensile strength for reliable performance in high-stress applications
- Optimized thread engagement through UNC coarse threading and Class 2A fit, ensuring secure fastening and reduced cross-threading risks
- Enhanced durability with Rockwell B69 hardness, maintaining structural integrity under repeated use and vibration
- Versatile installation with partially threaded design, allowing precise clamping force control across various material thicknesses
- Broad compatibility with standard slotted drivers, facilitating quick assembly and maintenance operations
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards for global industrial use
Professional Applications & Engineering Value
This zinc-plated steel rounded head screw delivers critical engineering solutions for industrial assembly challenges. The UNC coarse thread configuration provides rapid installation in soft materials and castings, while the partial threading design enables precise joint compression control in structural applications. The slotted drive maintains compatibility with traditional tooling, making it ideal for maintenance operations and legacy equipment. With 60,000 psi tensile strength and corrosion-resistant plating, these screws withstand vibration, thermal cycling, and environmental exposure in machinery, electrical enclosures, and construction applications where reliability is paramount.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 standards with Class 2A thread fit tolerance for consistent mating with standard nuts and tapped holes. Features 1/4"-20 UNC coarse threads with right-hand direction and 3-1/2" length with minimum 1-1/2" thread engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries and international markets.
