S-99926A104 4-40 x 3/8" 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 for long-lasting performance in harsh industrial environments
- Exceptional thread reliability through Class 3A precision fit, ensuring secure fastening and vibration resistance
- Enhanced driving efficiency with 1/16" hex drive design, providing superior torque transmission and reduced cam-out risk
- Optimal flush mounting featuring undercut flat head profile with 100° countersink angle for seamless surface integration
- High mechanical strength delivering 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Controlled thread engagement through partial threading design, preventing over-tightening and material damage
- Environmental compliance assurance meeting RoHS 3 and REACH standards for safe, sustainable industrial use
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering advantages for precision assembly applications where surface finish integrity and reliable fastening are paramount. The 18-8 stainless steel composition combined with passivated finish provides exceptional corrosion resistance in demanding environments including electronics enclosures, aerospace components, and medical devices. The undercut flat head profile with 100° countersink angle ensures perfect flush mounting without protrusion, while the Class 3A thread fit maintains precise tolerances for vibration-resistant connections. The partial threading design prevents thread interference in blind holes, making these hex drive screws ideal for applications requiring controlled clamp load and repeated maintenance access.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and UNC coarse thread specifications. These flat head screws maintain dimensional accuracy with 0.255" head diameter, 3/8" length, and 0.31" minimum thread length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations ensures suitability for global industrial applications requiring restricted substance control.
