S-90277A107 4-40 x 5/16" ASME B18.6.3 Steel Binding Head Slotted Screws
Steel Binding 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, ensuring long-term reliability in harsh industrial environments
- Exceptional holding power from 60,000 psi tensile strength and Rockwell B69 hardness, preventing fastener failure under stress
- Quick installation and removal with slotted drive design and coarse UNC threading for efficient assembly operations
- Precise thread engagement through Class 2A thread fit, reducing cross-threading risks and ensuring consistent performance
- Wide bearing surface from rounded binding head profile, distributing clamp load effectively across mounted components
- Full regulatory compliance meeting ASME B18.6.3 standards plus RoHS 3 and REACH environmental directives
- Complete thread coverage with fully threaded design, providing maximum grip along the entire 5/16" length
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws deliver critical performance where vibration resistance and environmental durability are paramount. The binding head style creates a wide clamping surface that prevents pull-through in softer materials, while the slotted drive accommodates both manual and automated installation. The coarse thread spacing ensures rapid assembly in production environments, and the Class 2A thread fit maintains precision across repeated disassembly cycles. Ideal for electrical enclosures, machinery panels, and industrial equipment requiring RoHS 3 and REACH compliance, these screws provide reliable fastening in applications demanding both mechanical strength and regulatory adherence.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for consistent engagement. Features 4-40 UNC coarse threads, fully threaded 5/16" length, and right-hand thread direction. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safe use across regulated industries.
