S-99926A137 1/4"-20 x 5/8" 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 mechanical strength offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable, long-term fastening
- Precise thread engagement with Class 3A thread fit ensuring secure, vibration-resistant connections in critical assemblies
- Optimized head design featuring an undercut flat head and 100° countersink angle for flush, unobtrusive installations
- Efficient installation and removal with a hex drive (1/8") design, reducing assembly time and tool slippage
- Versatile partial threading allowing for controlled clamping force and simplified alignment in various applications
- Full regulatory compliance with RoHS 3 and REACH standards, ensuring safety and environmental responsibility
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these 1/4-20 UNC flat head screws provide a robust fastening solution where precision and durability are paramount. The 18-8 stainless steel material combined with a passivated finish resists oxidation and chemical exposure, extending service life in machinery, automotive, and electronic enclosures. The Class 3A thread fit and coarse thread spacing ensure quick assembly and high resistance to loosening under dynamic loads. The undercut flat head profile and 100° countersink angle allow for a seamless fit, reducing protrusion and improving aesthetic integration. These screws are ideal for applications requiring reliable performance, such as securing components in assembly lines or structural frameworks, where partially threaded design aids in precise tension control.
Specification Summary & Compliance
This product adheres to UNC thread standards with a Class 3A thread fit for high precision. Dimensions include a 1/4"-20 thread size, 5/8" length, and coarse thread spacing. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental and safety standards are upheld for industrial use.
