S-91771A129 5-40 x 3/4" 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 delivering 80,000 PSI tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Precision threading with Class 2A UNC coarse threads ensuring secure, vibration-resistant fastening in demanding applications
- Optimized drive engagement featuring Phillips No. 2 drive for efficient installation and reduced cam-out risk
- Full-threaded design providing maximum grip length and uniform stress distribution across the entire fastener
- Standard 82° countersink angle enabling flush mounting in prepared surfaces for clean, professional finishes
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 5-40 UNC flat head screws deliver critical engineering advantages through their passivated 18-8 stainless steel composition and precision manufacturing. The combination of 80,000 PSI tensile strength and Rockwell B80 hardness ensures reliable performance in vibration-prone applications while resisting industrial corrosion. The fully threaded design with UNC coarse threads provides superior holding power in softer materials and faster installation in production environments. The Phillips No. 2 drive offers familiar, efficient driving for assembly lines, while the standard flat head profile creates seamless finishes in countersunk applications across machinery, electronics, and structural components where flush surfaces are mandatory.
Specification Summary & Compliance
Manufactured to exact ASME B18.6.3 specifications with Class 2A thread fit tolerances for consistent performance. Features 5-40 UNC coarse threads in right-hand orientation, 3/4" length, and standard 82° countersink angle. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
