S-91099A169 4-40 x 5/8" 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 for extended service life in harsh environments
- Exceptional tensile strength rated at 80,000 psi to withstand high-stress applications without failure
- Precise flush mounting with 82° countersink angle and undercut flat head profile for seamless surface integration
- Reliable thread engagement through Class 2A thread fit and coarse UNC threading for secure fastening
- Optimized drive performance with Phillips No. 1 drive style providing efficient installation and removal
- Consistent mechanical properties with Rockwell B80 hardness ensuring dimensional stability under load
- Full regulatory compliance meeting ASME B18.6.3 specifications and environmental standards including RoHS 3 and REACH
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering advantages where surface-flush fastening and corrosion resistance are paramount. The passivated 18-8 stainless steel construction provides exceptional protection against oxidation and chemical exposure, making these Phillips drive screws ideal for electronics enclosures, marine equipment, and food processing machinery. The undercut flat head profile ensures complete seating without protrusion, while the coarse thread spacing facilitates rapid assembly in production environments. With 80,000 psi tensile strength and Rockwell B80 hardness, these industrial-grade fasteners maintain structural integrity in vibration-prone applications, reducing maintenance cycles and replacement costs.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 standards with Class 2A thread fit tolerances for consistent mating with threaded components. Features UNC coarse threading with right-hand thread direction and full threading along the 5/8" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
