S-91355A154 4-40 x 5/16" Steel Flanged Button Head Hex-Drive Screws
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 Black-Oxide coating, extending service life in harsh industrial environments
- Exceptional tensile strength (120,000 psi) ensures reliable performance under high-stress applications
- Precision Class 3A thread fit provides secure, vibration-resistant fastening with minimal backlash
- Wide button head design with integrated flange distributes clamping force evenly and eliminates need for separate washers
- Hex drive compatibility allows for high-torque installation with standard industrial tools
- Full threading along 5/16" length enables maximum engagement depth and adjustment flexibility
- Rockwell C32 hardness rating maintains thread integrity through repeated installation cycles
Professional Applications & Engineering Value
These 4-40 UNC Class 3A Rounded Head Screws deliver critical performance advantages in precision assembly applications where vibration resistance and consistent clamping force are paramount. The Black-Oxide Alloy Steel construction provides superior protection against corrosion in manufacturing environments, while the wide button head profile with integrated flange prevents surface damage and maintains seal integrity in electronic enclosures, machinery guards, and automotive components. The coarse UNC threading ensures rapid installation in production lines, and the Class 3A thread fit guarantees precise engagement in tapped holes, reducing the risk of cross-threading in high-volume assembly operations. Engineered for industrial screw applications requiring reliable, repeatable fastening performance.
Specification Summary & Compliance
Manufactured to precise UNC thread standards with Class 3A thread fit tolerance for superior engagement. Features coarse thread spacing with 4-40 thread size and 5/16" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The right-hand thread direction and fully threaded design meet industrial fastening specifications for consistent performance across applications.
