S-91771A895 4-40 x 1 1/2" 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 flush mounting achieved through undercut flat head design and 82° countersink angle
- Secure fastening engagement with Class 2A thread fit and coarse thread spacing for vibration resistance
- Industry-standard compatibility meeting ASME B18.6.3 specifications for consistent quality and interchangeability
- Environmental compliance assurance with RoHS 3 and REACH regulations for sustainable manufacturing
- Full-threaded design providing maximum grip length and uniform stress distribution
Professional Applications & Engineering Value
These 4-40 UNC flat head Phillips screws deliver critical engineering solutions where flush surface mounting and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides exceptional durability against chemical exposure and atmospheric conditions, while the undercut flat head profile ensures seamless integration without protrusion. The coarse thread spacing and Class 2A thread fit maintain secure fastening in high-vibration industrial equipment, electronic enclosures, and precision machinery. With 80,000 psi tensile strength, these fully threaded fasteners withstand significant mechanical stress while the 82° countersink angle guarantees optimal seating in standardized applications. Ideal for aerospace components, marine hardware, and industrial automation systems requiring reliable, compliant fastening solutions.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 standards with Class 2A thread fit precision and UNC coarse thread spacing. These 1-1/2" flat head screws feature complete compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The right-hand threaded fasteners maintain dimensional accuracy across all critical parameters including head diameter (0.212"), head height (0.047"), and drive size (No. 1 Phillips) for consistent performance in industrial applications.
