S-90279A541 1/4"-20 x 7/8" 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-plated steel construction, extending service life in harsh industrial environments
- High tensile strength of 60,000 psi ensures reliable fastening under demanding mechanical loads
- Class 2A thread fit with UNC coarse spacing provides quick assembly and secure holding power
- Rockwell B69 hardness rating maintains structural integrity and resists deformation during installation
- Full threading along 7/8" length offers maximum grip and uniform stress distribution
- Phillips No. 3 drive design enables efficient torque application with standard tools
- Compliance with ASME B18.6.3, RoHS 3, and REACH guarantees quality, safety, and environmental standards
Professional Applications & Engineering Value
Engineered for industrial applications requiring durable fastening solutions, these zinc-plated steel rounded head screws address common challenges like vibration loosening and environmental degradation. The UNC coarse thread design ensures rapid installation in metal, wood, and composite materials, while the fully threaded 1/4-20 configuration provides consistent clamping force across the entire length. With 60,000 psi tensile strength and Rockwell B69 hardness, they prevent stripping and maintain joint integrity in machinery, electrical enclosures, and structural assemblies. The Phillips drive and rounded head profile facilitate smooth countersinking and reduce surface damage, making them ideal for production lines and maintenance operations where reliability and compliance with ASME B18.6.3 standards are critical.
Specification Summary & Compliance
This screw features precise Class 2A thread fit with UNC coarse spacing and 1/4-20 thread size, manufactured to ASME B18.6.3 specifications for dimensional accuracy. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring adherence to environmental and safety standards. The right-hand thread direction and 7/8" length provide consistent performance in industrial fastening applications.
