S-91771A114 4-40 x 7/8" 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 delivering 80,000 PSI tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Precise flush mounting enabled by the standard flat head profile with 82° countersink angle for seamless surface integration
- Optimized drive engagement through Phillips No. 1 drive design, reducing cam-out risks during installation
- Consistent threading performance with fully threaded UNC coarse pattern and Class 2A fit for secure fastening
- Regulatory compliance assurance meeting ASME B18.6.3 standards and environmental regulations including RoHS 3 and REACH
- Versatile industrial compatibility with 7/8" length and right-hand thread direction for broad application across machinery and equipment
Professional Applications & Engineering Value
These 4-40 UNC flat head screws in passivated 18-8 stainless steel address critical engineering challenges in industrial settings. The combination of 80,000 PSI tensile strength and Rockwell B80 hardness ensures reliable performance under mechanical stress, while the fully threaded coarse pattern provides superior holding power in various materials. The 82° countersink angle and flat head design enable flush surface mounting, eliminating protrusions in precision assemblies. Particularly valuable in corrosion-prone environments, these screws maintain integrity in manufacturing equipment, electronic enclosures, and machinery components where Phillips No. 1 drive facilitates efficient installation without specialized tools.
Specification Summary & Compliance
Manufactured to exacting dimensional standards with Class 2A thread fit and UNC coarse threading for consistent performance. Complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring suitability for regulated industrial applications worldwide.
