S-91440A189 8-32 x 1/4" ASME B18.6.3 Steel Round Head Combination Phillips/Slotted Screws
Steel Round Head Combination Phillips/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
- Enhanced driving versatility with combined Phillips/Slotted No. 2 drive for flexible installation tool options
- Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
- Optimized load distribution through rounded head design that minimizes surface stress and damage
- Maximum material penetration with fully threaded design providing superior holding power across the entire length
- High mechanical strength with 60,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Dual-drive compatibility allowing use with both Phillips and flat-head tools for installation flexibility
Professional Applications & Engineering Value
Engineered for industrial assembly challenges, these 8-32 UNC zinc-plated steel screws deliver exceptional performance in machinery, electrical enclosures, and metal fabrication. The coarse thread design provides rapid installation and superior resistance to vibration loosening, while the rounded head profile distributes clamping force evenly without damaging softer materials. The dual Phillips/Slotted drive system offers installation flexibility in confined spaces, and the zinc plating creates a protective barrier against corrosion in humid or outdoor environments. With fully threaded construction and precise Class 2A thread fit, these fasteners ensure consistent engagement and reliable performance across repetitive assembly operations.
Specification Summary & Compliance
This 1/4" length screw features precise Class 2A thread fit with UNC coarse threading (8-32) and right-hand thread direction. Manufactured to ASME B18.6.3 specifications with Rockwell B70 hardness and 60,000 psi tensile strength. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
