S-94518A112 4-40 x 5/8" QQ-P-35, MS24671-4 Stainless Steel Hex Drive Flat Head Screws
Stainless Steel Hex Drive 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 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Exceptional tensile strength of 70,000 psi ensures reliable performance under high-stress applications
- Precision Class 3A thread fit guarantees secure fastening and vibration resistance in critical assemblies
- Standard 82° countersink angle provides flush mounting for streamlined surfaces and improved aesthetics
- Hex drive design with 1/16" drive size allows for easy installation and high torque application without slippage
- Fully threaded UNC coarse thread delivers rapid installation and strong holding power in various materials
- Compliance with Fed. Spec. QQ-P-35 (MS24671-4) ensures consistent quality and interchangeability in regulated industries
Professional Applications & Engineering Value
These 4-40 UNC flat head screws are engineered to address common industrial challenges such as corrosion, vibration loosening, and precise alignment requirements. The 18-8 stainless steel material combined with a passivated finish provides excellent protection against rust and chemical exposure, making them ideal for electronics enclosures, machinery panels, and automotive assemblies. The hex drive and Class 3A thread fit ensure tight, reliable fastening in high-vibration environments, while the fully threaded coarse UNC design allows for quick installation and superior grip in soft or hard substrates. This combination of features minimizes maintenance needs and enhances the longevity of critical components.
Specification Summary & Compliance
This flat head screw features a 4-40 UNC thread with Class 3A precision fit and coarse thread spacing for optimal performance. It meets Fed. Spec. QQ-P-35 (MS24671-4) manufacturing standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe and sustainable use across global markets.
