S-90276A103 4-40 x 1/8" ASME B18.6.3 Steel Round Head Slotted Screws
Steel Round Head Slotted 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 B69 hardness to withstand high-stress applications
- Reliable thread engagement through Class 2A fit UNC coarse threads ensuring consistent fastening performance
- Quick installation and removal with standard slotted drive design compatible with common tools
- Reduced surface damage risk from rounded head profile that minimizes marring on contact surfaces
- Full-threaded design providing maximum grip length and uniform load distribution
- Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel screws deliver critical performance advantages in industrial fastening applications where reliability and durability are paramount. The combination of zinc-plated steel material and coarse thread spacing provides excellent resistance to vibration loosening and environmental degradation, making them ideal for electronics assembly, machinery components, and automotive applications. The fully threaded design ensures maximum holding power across the entire fastener length, while the standard rounded head profile with slotted drive offers compatibility with existing tooling systems. Engineered to maintain integrity under continuous stress, these screws solve common industrial challenges including fastener fatigue, corrosion-induced failure, and installation inconsistency in high-volume manufacturing environments.
Specification Summary & Compliance
This rounded head screw features precise Class 2A thread fit with UNC coarse threading (4-40 size) and right-hand direction. Manufacturing adheres to ASME B18.6.3 specifications for dimensional accuracy and performance standards. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. Critical dimensions include 1/8" length, 0.211" head diameter, and standard rounded head profile for consistent installation performance.
