S-90128A042 2-56 x 1/4" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion resistance through zinc plating protects against environmental degradation in demanding conditions
- Precision Class 3A thread fit guarantees consistent engagement and vibration resistance in critical assemblies
- Rockwell C37 hardness rating provides excellent wear resistance and long-term durability
- Standard hex drive compatibility with 5/64" drive size enables efficient installation and removal
- Fully threaded right-hand design offers maximum grip length and uniform load distribution
- Coarse UNC thread spacing facilitates quick assembly and disassembly in time-sensitive operations
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these zinc-plated alloy steel socket head cap screws deliver exceptional performance where reliability is critical. The 2-56 UNC coarse thread configuration provides superior holding power in materials prone to stripping, while the Class 3A thread fit ensures precise engagement that withstands vibration and dynamic loads. The socket head design with 5/64" hex drive allows for high torque application in confined spaces, making these fasteners ideal for machinery, automotive components, and precision equipment assemblies. The combination of 170,000 psi tensile strength and Rockwell C37 hardness creates a fastener solution that maintains integrity under extreme mechanical stress, reducing maintenance frequency and downtime in continuous operation scenarios.
Specification Summary & Compliance
This socket head cap screw features precision Class 3A thread fit with 2-56 UNC coarse thread spacing and right-hand thread direction. Manufactured to ASTM A574 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fastener maintains dimensional accuracy with 1/4" length, 9/64" head diameter, and standard socket head profile for consistent performance across industrial applications.
