S-90272A110 4-40 x 1/2" ASME B18.6.3 Steel Pan Head Phillips Screws
Steel Pan 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 mechanical stress and vibration
- Rockwell B70 hardness provides excellent durability and resistance to wear during installation and use
- Class 2A thread fit with UNC coarse threading enables quick assembly and secure holding power
- Fully threaded design offers maximum grip length and consistent clamping force across applications
- Phillips drive with No. 1 size allows for efficient torque transfer and reduced cam-out during installation
- Pan-style rounded head combines low-profile aesthetics with practical seating for flush or semi-flush mounting
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly efficiency. The zinc plating provides a protective barrier against moisture and chemicals, making them suitable for outdoor equipment, electrical enclosures, and machinery exposed to demanding conditions. The coarse UNC thread and Class 2A fit ensure rapid installation with minimal cross-threading risk, while the fully threaded design maintains consistent engagement in materials like sheet metal, plastics, and assembled components. With a Phillips drive and pan head profile, these screws offer reliable torque application and a clean finish, ideal for applications where both performance and appearance matter in industrial and OEM settings.
Specification Summary & Compliance
These screws feature precise Class 2A thread fit per UNC standards, ensuring dimensional accuracy and interchangeability. Manufactured in compliance with ASME B18.6.3 specifications for consistent quality and performance. They are fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for use in various markets.
