S-90277A106 4-40 x 1/4" 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 for extended service life in harsh industrial environments
- Exceptional mechanical strength with 60,000 psi tensile strength and Rockwell B69 hardness for reliable load-bearing performance
- Optimized thread engagement through Class 2A thread fit and coarse UNC threading ensures secure fastening and vibration resistance
- Wide binding head design provides enhanced surface contact and prevents pull-through in soft materials
- Full threading along 1/4" length enables maximum grip depth and uniform stress distribution
- Slotted drive compatibility allows for quick installation with standard screwdrivers across various applications
- Regulatory compliance assurance meeting ASME B18.6.3, RoHS 3, and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
These 4-40 UNC zinc-plated steel rounded head screws deliver critical performance advantages in industrial assembly and electronic enclosures where corrosion resistance and mechanical reliability are paramount. The binding head style with wide profile distributes clamping force effectively, preventing damage to softer substrates while the coarse thread design maintains secure fastening in vibration-prone environments. The zinc-plated steel construction provides essential protection against oxidation and chemical exposure, extending component lifespan in manufacturing equipment, electrical panels, and machinery assemblies. With full threading along the entire 1/4" length, these screws ensure maximum thread engagement for superior holding power in both through-hole and tapped applications.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with UNC coarse threading (4-40 size) and fully threaded 1/4" length. Compliant with ASME B18.6.3 mechanical standards, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) regulations for chemical safety. The right-hand thread direction and slotted drive style conform to industry-standard installation practices.
