S-91249A531 1/4"-20 x 3/8" ASME B18.6.3 Stainless Steel Pan Head Phillips Screws
Stainless Steel Pan Head Phillips 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 18-8 stainless steel and black-oxide coating for extended service life in harsh environments
- Exceptional holding power achieved through 70,000 psi tensile strength and Rockwell B70 hardness for reliable fastening
- Optimized installation efficiency with No. 3 Phillips drive and fully threaded UNC coarse spacing for quick assembly
- Precise thread engagement with Class 2A thread fit ensuring consistent performance and vibration resistance
- Broad industrial compliance meeting ASME B18.6.3 standards plus RoHS 3 and REACH environmental regulations
- Enhanced grip surface from the rounded pan head design providing improved driver contact and torque transmission
- Versatile compatibility with 1/4"-20 UNC thread specification suitable for various industrial applications
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these black-oxide 18-8 stainless steel pan head screws deliver exceptional performance where corrosion resistance and structural integrity are paramount. The combination of 70,000 psi tensile strength and Rockwell B70 hardness ensures reliable fastening in heavy machinery, construction equipment, and manufacturing systems. The fully threaded UNC coarse spacing provides maximum thread engagement and holding power, while the No. 3 Phillips drive facilitates efficient installation in high-volume assembly operations. The rounded pan head profile offers superior driver engagement, reducing cam-out incidents and improving installation consistency across production lines.
Specification Summary & Compliance
This 1/4"-20 x 3/8" pan head screw features precision Class 2A thread fit with UNC coarse thread spacing for optimal performance. Manufactured in compliance with ASME B18.6.3 standards, the fastener meets rigorous dimensional and mechanical requirements. Environmental compliance is assured through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) certifications, making these screws suitable for regulated industries and international projects requiring strict material and safety standards.
