S-98070A106 4-40 x 3/16" Sealing Stainless Steel Phillips Flat Head Screws

Key Features & Benefits at a Glance

• Reliable Sealing Performance: Integrated silicone O-ring creates a durable seal, preventing leaks and ingress of contaminants in demanding applications.
• Exceptional Corrosion Resistance: Made from 18-8 Stainless Steel with a passivated finish for long-term reliability in harsh or corrosive environments.
• High Strength and Durability: With a 70,000 psi tensile strength, this screw maintains integrity under high-stress conditions and mechanical loads.
• Wide Temperature Tolerance: The silicone O-ring functions effectively across an extreme range from -150°F to 500°F, suitable for various thermal cycles.
• Secure and Precise Fastening: Features a Class 2A thread fit and UNC coarse threads for easier alignment and a secure, vibration-resistant hold.
• High-Pressure Capability: Rated for a maximum pressure of 20,000 psi, ensuring performance in high-pressure sealing applications.
• Streamlined Assembly: The flat head and Phillips drive design allows for a flush finish and straightforward installation with common tools.

Professional Applications & Engineering Value

This 4-40 UNC Flat Head Phillips screw is engineered to solve critical challenges in industrial sealing and fastening. The combination of 18-8 Stainless Steel and a passivated finish provides excellent corrosion resistance, making it ideal for use in environments exposed to moisture, chemicals, or outdoor elements. The integrated silicone rubber O-ring is key for applications requiring a reliable seal against fluids, gases, and dust, such as in enclosures, fluid handling systems, and automotive components. Its ability to withstand extreme temperatures from -150°F to 500°F ensures performance stability in both cryogenic and high-heat scenarios. The coarse UNC threading and precise Class 2A fit facilitate quick and secure installation, reducing assembly time and preventing thread stripping, which is crucial for high-volume manufacturing and maintenance operations.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a precise Class 2A thread fit for consistent and reliable engagement. The dimensional specifications include a 3/16" length, #1 Phillips drive, and a 100° countersink angle for a flush mount. It is manufactured to meet industry requirements and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for use in various global markets.