S-90279A552 1/4"-20 x 2 1/2" 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, ensuring long-term reliability in harsh industrial environments
- High tensile strength of 60,000 psi provides exceptional load-bearing capacity for demanding structural applications
- Precise Class 2A thread fit guarantees smooth installation and secure fastening with standard UNC coarse threading
- Optimized Phillips drive design enables efficient torque transfer and reduced cam-out during high-volume assembly operations
- Partially threaded shank design allows for controlled clamping force distribution and improved joint stability
- Rockwell B69 hardness rating ensures consistent performance under repetitive stress and vibration
- Full regulatory compliance with ASME B18.6.3, RoHS 3, and REACH standards for global industrial deployment
Professional Applications & Engineering Value
These zinc-plated steel rounded head screws deliver critical engineering solutions for industrial assembly challenges. The combination of UNC coarse threading and partial threading provides superior resistance to vibration loosening in machinery and equipment applications. The Phillips drive system ensures rapid installation in high-volume production environments while maintaining consistent torque transmission. With 60,000 psi tensile strength and corrosion-resistant zinc plating, these fasteners excel in construction, metal fabrication, and heavy equipment applications where durability and regulatory compliance are paramount. The rounded head profile distributes clamping pressure evenly, preventing surface damage while meeting strict ASME B18.6.3 dimensional specifications.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1/4"-20 UNC coarse threads and partial threading up to 1-1/2". Complies with ASME B18.6.3 mechanical and dimensional requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for hazardous substance restrictions. Material certification includes Rockwell B69 hardness and 60,000 psi tensile strength verification.
