S-91802A112 4-40 x 5/8" ASME B18.6.3 Stainless Steel Phillips Oval Head Screws
Stainless Steel Phillips Oval 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.
- High tensile strength of 80,000 psi ensures reliable performance under heavy loads and vibration.
- Excellent drive engagement with Phillips No. 1 drive style, reducing cam-out and tool slippage during installation.
- Optimized flush seating from the standard oval head profile and 82° countersink angle for a smooth, professional finish.
- Precise coarse threading (UNC) with Class 2A fit enables quick assembly and strong holding power.
- Full threading along the 5/8" length provides maximum grip and uniform stress distribution in materials.
- Compliance with ASME B18.6.3 and RoHS/REACH guarantees material safety and interchangeability in regulated applications.
Professional Applications & Engineering Value
These 4-40 UNC oval head Phillips flat head screws are engineered to address common challenges in precision assembly, such as material fatigue and corrosion-induced failure. The passivated 18-8 stainless steel offers exceptional durability against moisture, chemicals, and oxidation, extending service life in demanding sectors like electronics enclosures, machinery panels, and automotive components. The combination of a coarse thread spacing and fully threaded design ensures rapid installation and robust retention in softer materials or pre-tapped holes, reducing the risk of stripping. With a Rockwell B80 hardness and standardized oval head profile, these screws deliver consistent performance where a flush, low-profile finish is critical, minimizing protrusion and enhancing aesthetic integrity in visible applications.
Specification Summary & Compliance
This product adheres to Class 2A thread fit tolerances per UNC standards, ensuring precise engagement and interchangeability. Manufacturing and dimensional criteria comply with ASME B18.6.3, while material safety is verified through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming the absence of restricted substances for use in global markets.
