S-91771A166 1-72 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
- Precise flush mounting with 82° countersink angle and flat head design for seamless surface integration
- Exceptional mechanical strength delivering 80,000 psi tensile strength and Rockwell B80 hardness for reliable load-bearing performance
- Optimized drive engagement through Phillips No. 0 drive design, reducing cam-out risks during installation
- Consistent threading performance with Class 2A fine thread fit ensuring vibration resistance and secure fastening
- Full-threaded design providing maximum grip length and uniform stress distribution across applications
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and global environmental standards
Professional Applications & Engineering Value
These 1-72 UNF flat head screws deliver critical engineering solutions where surface finish integrity and corrosion resistance are paramount. The passivated 18-8 stainless steel construction prevents galvanic corrosion in chemical processing, marine, and food-grade applications, while the 82° countersink angle ensures perfect flush mounting in precision machinery and electronic enclosures. The fine UNF threading with Class 2A fit maintains clamping force under vibration, making these Phillips drive screws ideal for aerospace components, medical devices, and automotive assemblies where reliability cannot be compromised. The combination of 80,000 psi tensile strength and full threading provides superior fatigue resistance in high-stress applications.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 specifications with Class 2A thread fit tolerance for precision assembly. The 1-72 UNF fine thread configuration ensures consistent engagement, while the right-hand threading and fully threaded design provide uniform load distribution. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, guaranteeing safe use across global industrial markets.
