S-90275A119 4-40 x 1 1/2" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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 for extended service life in demanding environments
- Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing performance
- Precision thread engagement with Class 2A fit and UNC coarse threads ensuring secure fastening and vibration resistance
- Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Full-threaded coverage along the 1 1/2" length provides maximum grip and distribution of clamping force
- Broad compatibility with slotted drive tools for straightforward installation across various applications
- Regulatory confidence with compliance to major industrial and environmental standards
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where flush surface mounting and high tensile strength are paramount. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, machinery assemblies, and electronic enclosures exposed to moderate environmental factors. The coarse UNC threads and Class 2A thread fit ensure rapid installation and reliable performance in materials where fine threads might strip or fail. With full threading across the entire 1½" length, these screws maximize thread engagement in both thin and thick materials, distributing clamp load evenly to prevent joint failure. The standardized 82° countersink angle allows the flat head to sit perfectly flush, eliminating protrusions in precision assemblies while maintaining structural integrity under vibration and dynamic loads.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications. These flat head screws comply with ASME B18.6.3 manufacturing standards ensuring consistent quality and interchangeability. Environmental compliance is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming restricted substance adherence for global industrial applications.
