S-91771A124 5-40 x 1/4" ASME B18.6.3 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips Flat Head 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 passivated 18-8 stainless steel construction, ideal for harsh industrial environments
- Exceptional mechanical strength with 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Precision thread engagement through Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Efficient installation with Phillips No. 2 drive and standard 82° countersink angle for flush mounting in various materials
- Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
- Regulatory compliance meeting ASME B18.6.3 specifications for dimensional accuracy and performance standards
- Environmental safety through RoHS 3 and REACH compliance, ensuring hazardous substance-free manufacturing
Professional Applications & Engineering Value
These 5-40 UNC flat head screws deliver critical engineering solutions where flush mounting and corrosion resistance are paramount. The passivated 18-8 stainless steel construction prevents galvanic corrosion and withstands aggressive environments, while the Class 2A thread fit maintains precise tolerances for repeated assembly/disassembly cycles. The combination of 80,000 psi tensile strength and fully threaded design ensures uniform load distribution in machinery, electronic enclosures, and automotive components. The standard 82° countersink angle and Phillips No. 2 drive facilitate quick installation in confined spaces, reducing assembly time and improving production efficiency across manufacturing and maintenance operations.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A UNC coarse thread tolerances ensuring dimensional accuracy. Features include right-hand threading, 1/4" length, and standard flat head profile. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming hazardous substance-free composition. Mechanical properties verified to 80,000 psi tensile strength and Rockwell B80 hardness for consistent performance in industrial fastening applications.
