S-90471A427 4-40 x 5/8" 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 demanding industrial environments
- Exceptional holding power with 60,000 psi tensile strength, ensuring reliable fastening under heavy loads
- Optimized drive engagement through Phillips No. 1 drive design, preventing cam-out during installation
- Precise thread alignment with Class 2A UNC coarse threads, enabling quick assembly and reduced cross-threading risks
- Flush mounting capability with standard 100° countersink angle, creating smooth surfaces in assembled products
- Consistent performance backed by Rockwell B70 hardness, maintaining structural integrity through repeated use
- Full-threaded design providing maximum grip along the entire 5/8" length for enhanced load distribution
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where flush surface mounting and high-strength fastening are paramount. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, electronic enclosures, and machinery assemblies exposed to moderate environmental conditions. The coarse UNC threading ensures rapid installation in various materials while the Class 2A thread fit maintains precise tolerances for consistent performance. The Phillips drive system offers familiar, efficient installation with standard tools, reducing assembly time in production environments. These fully threaded screws maximize contact surface area, distributing stress evenly to prevent joint failure in vibration-prone applications.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with Class 2A thread fit tolerances ensuring dimensional accuracy and interchangeability. These flat head screws feature standard UNC coarse threads (4-40) with right-hand orientation and complete compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The mechanical properties include verified 60,000 psi tensile strength and Rockwell B70 hardness, meeting industrial fastening requirements for durability and performance.
