S-93085A557 1/4"-28 x 1/2" FF-S-92, QQ-P-35, MS24693-C294, NASM24693, SAE AMS2700 Stainless Steel Phillips Flat Head Screws
Stainless Steel Phillips 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 from passivated 18-8 stainless steel construction, ideal for harsh environments and long-term reliability.
- High tensile strength of 70,000 psi ensures secure fastening under demanding mechanical loads, reducing failure risks.
- Precise Class 2A thread fit with UNF fine threading for smooth installation and vibration resistance in critical assemblies.
- Optimized Phillips No. 3 drive provides efficient torque transfer and reduces cam-out during installation.
- 100° countersink angle and standard flat head profile enable flush mounting, minimizing protrusion and improving aesthetics.
- Full threading along the 1/2" length allows for adjustable grip and consistent holding power across materials.
- Compliance with multiple industry standards including Fed. Spec. FF-S-92 and RoHS 3, ensuring quality and regulatory adherence.
Professional Applications & Engineering Value
This 1/4"-28 UNF flat head screw is engineered to address common industrial challenges such as corrosion, vibration loosening, and assembly precision. The passivated 18-8 stainless steel material offers excellent resistance to oxidation and chemicals, making it suitable for applications in marine, automotive, and electronic enclosures where environmental factors are a concern. The fine thread spacing and Class 2A thread fit provide superior engagement in tapped holes, reducing the risk of stripping and maintaining clamp force under dynamic conditions. Combined with the Phillips drive and 100° countersink, it ensures easy installation and a seamless finish, enhancing both performance and aesthetics in industrial fastening systems.
Specification Summary & Compliance
The screw adheres to Class 2A thread fit tolerances per UNF standards, ensuring dimensional accuracy and interchangeability. It meets specifications including Fed. Spec. FF-S-92, QQ-P-35, MS24693-C294, NASM24693, and SAE AMS2700, and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental suitability for global industrial use.
