S-91255A105 4-40 x 3/16" ASTM F835 Steel Button Head Hex-Drive Screws
Steel 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
- Exceptional tensile strength of 120,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Precise Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic applications.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable, non-reflective finish for extended service life.
- Fully threaded design allows for maximum grip and holding power along the entire screw length, improving assembly security.
- Hex drive with 1/16" size enables easy installation and high torque application, reducing tool slippage and installation time.
- Rockwell C39 hardness ensures high wear resistance and durability, maintaining integrity in repetitive or harsh environments.
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability, meeting rigorous industrial standards.
Professional Applications & Engineering Value
These 4-40 UNC rounded head hex drive screws are engineered to address common industrial challenges such as vibration-induced loosening and corrosion in demanding environments. The black-oxide alloy steel construction, combined with a Class 3A thread fit, ensures tight tolerances and reliable performance in precision assemblies like electronics, machinery, and automotive components. The fully threaded coarse thread design enhances grip in softer materials, while the button head style provides a low-profile, secure fastening solution that resists snagging. Ideal for applications requiring high tensile strength and environmental compliance, these screws reduce maintenance needs and improve operational longevity in industrial screw applications.
Specification Summary & Compliance
This product adheres to Class 3A thread fit per UNC standards, ensuring precise dimensional accuracy and interchangeability. It meets ASME B18.3 and ASTM F835 specifications for consistent manufacturing quality. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe usage in global markets.
