S-98070A139 4-40 x 3/8" 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
- Superior sealing performance with a Buna-N rubber O-ring that effectively prevents leaks in demanding applications.
- Excellent corrosion resistance thanks to 18-8 Stainless Steel construction and a passivated finish for long-term durability.
- High-pressure reliability, capable of withstanding up to 1500 psi, ensuring secure fastening in pressurized systems.
- Wide temperature tolerance from -40° to 225° F, making it suitable for diverse industrial environments.
- Precise thread fit with Class 2A UNC coarse threads for easy installation and reduced risk of cross-threading.
- Optimized head design featuring an undercut flat head and 100° countersink angle for a flush, low-profile finish.
- Environmental compliance with RoHS 3 and REACH regulations, ensuring safe and sustainable use.
Professional Applications & Engineering Value
This 4-40 UNC Flat Head Phillips screw is engineered to address critical sealing challenges in industrial assemblies, such as fluid systems, machinery enclosures, and automotive components. The combination of 18-8 Stainless Steel and a passivated finish provides robust resistance to rust and chemical exposure, extending service life in harsh conditions. The integrated Buna-N rubber O-ring creates a reliable seal against moisture, dust, and gases, preventing failures in applications up to 1500 psi. Its fully threaded design and Class 2A thread fit ensure consistent clamping force and easy alignment, reducing assembly time and improving operational efficiency for engineers and maintenance teams.
Specification Summary & Compliance
This screw adheres to UNC coarse thread standards with a Class 2A thread fit for precise dimensional accuracy. It is manufactured from 18-8 Stainless Steel with a passivated finish and includes a Buna-N O-ring for sealing. The product complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.
