S-98070A150 4-40 x 1/2" Sealing Stainless Steel Phillips Flat Head Screws
Sealing Stainless Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Reliable sealing performance with silicone rubber O-rings that maintain integrity across extreme temperatures from -150°F to 500°F
- Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment for extended service life
- High-pressure containment capability rated for up to 20,000 psi, ensuring secure fastening in demanding applications
- Precision thread engagement with Class 2A UNC coarse threads providing consistent, reliable mating with components
- Optimized flush mounting through standard flat head profile with 100° countersink angle for smooth surface finishing
- Enhanced installation efficiency with Phillips No. 1 drive for secure tool engagement during assembly
- Full-length threading ensures maximum grip and load distribution along the entire 1/2" length
Professional Applications & Engineering Value
Engineered for critical sealing applications, these 4-40 UNC flat head screws with integrated silicone rubber O-rings solve common industrial challenges where fluid containment and environmental protection are paramount. The 18-8 stainless steel construction combined with passivated finish provides exceptional resistance to corrosion in harsh operating environments, while the Class 2A thread fit ensures precise, reliable engagement with mating components. These sealing screws are particularly valuable in hydraulic systems, pneumatic equipment, and industrial machinery where maintaining integrity under high-pressure conditions (up to 20,000 psi) and extreme temperature fluctuations is essential. The combination of flat head design and Phillips drive facilitates both secure installation and clean, flush mounting in countersunk applications.
Specification Summary & Compliance
This 4-40 UNC flat head screw features precision Class 2A thread fit with coarse thread spacing, manufactured to standard UNC specifications. The fastener maintains dimensional accuracy with a head diameter of 0.225" and is fully threaded along its 1/2" length. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and workplace safety, making these screws suitable for regulated industrial applications worldwide.
