S-90273A557 1/4"-28 x 1/2" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat 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 harsh industrial environments
- High-strength durability from Rockwell B70 hardness, resisting deformation under heavy loads
- Precise thread engagement with Class 2A fit and UNF fine threads, ensuring secure fastening in critical applications
- Efficient installation via Phillips No. 3 drive and 82° countersink, enabling flush mounting without tool slippage
- Full threading coverage along the 1/2" length, providing maximum grip strength across the entire fastener
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for global industrial use
- Reliable right-hand threading for standard assembly procedures, reducing installation errors
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these zinc-plated steel flat head screws solve critical fastening challenges where corrosion resistance and precise flush mounting are paramount. The UNF fine thread configuration maintains superior vibration resistance in machinery, automotive, and electrical enclosures, while the 82° countersink angle ensures seamless surface integration. The Phillips drive design provides reliable torque transfer during high-volume assembly operations. Manufactured to ASME B18.6.3 specifications, these fully threaded screws deliver consistent performance in applications requiring Class 2A thread fit precision and environmental compliance.
Specification Summary & Compliance
This 1/4"-28 UNF flat head screw maintains Class 2A thread fit tolerances per unified thread standards with fine thread spacing for precise engagement. Manufacturing complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. The product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements, ensuring environmental safety and regulatory acceptance for global industrial distribution.
