S-97654A341 4-40 x 1/4" Stainless Steel Flanged Button Head Hex-Drive Screws
Stainless Steel Flanged Button Head Hex-Drive 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 and passivated finish for extended service life in harsh environments
- High-strength performance offering 70,000 psi tensile strength and Rockwell B70 hardness for reliable load-bearing applications
- Precise thread engagement with Class 3A fit and UNC coarse thread spacing ensuring secure, vibration-resistant fastening
- Efficient installation via 1/16" hex drive and flanged design for quick tool engagement and increased bearing surface
- Versatile rounded button head provides a low-profile, finished appearance while reducing surface damage risks
- Full threading along the 1/4" length enables maximum grip and adjustment flexibility in assembled components
- Regulatory compliance with RoHS 3 and REACH standards for safe use in global industrial markets
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC rounded head screws deliver exceptional mechanical stability where vibration resistance and corrosion prevention are critical. The 18-8 Stainless Steel construction combined with a passivated finish effectively counters oxidation and chemical exposure in machinery, electronics enclosures, and automotive assemblies. The flanged button head design distributes clamping force over a wider area, minimizing component stress while the coarse UNC threads and Class 3A fit provide rapid assembly with reduced cross-threading risks. The hex drive ensures high-torque capability without cam-out, making these screws ideal for maintenance-intensive environments requiring repeated access.
Specification Summary & Compliance
This heavy-duty rounded head screw meets UNC thread standards with Class 3A precision tolerance for consistent fit. Dimensions include #4-40 thread size, 1/4" length, 0.234" flange diameter, and 1/16" hex drive. Manufacturing adheres to industry standards for fully threaded coarse spacing and is verified RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and material traceability.
