S-91251A102 2-56 x 5/8" 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
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress applications
- Precise Class 3A thread fit provides consistent engagement and vibration resistance in assembly operations
- Rockwell C37 hardness maintains structural integrity and prevents deformation during installation
- Standard hex socket drive allows for easy installation with common 5/64" hex tools in confined spaces
- Coarse UNC threading enables faster assembly and reduced cross-threading risks in production environments
- Full threading along 5/8" length offers maximum adjustability and secure fastening across various material thicknesses
Professional Applications & Engineering Value
Engineered for precision industrial applications, these black-oxide alloy steel socket head cap screws deliver exceptional performance in machinery, equipment manufacturing, and automotive assemblies. The 2-56 UNC coarse thread configuration provides rapid installation while maintaining secure fastening in vibration-prone environments. The socket head design with 5/64" hex drive enables access to confined spaces where traditional wrenches cannot operate. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures these fasteners withstand extreme mechanical stresses without compromising thread integrity. The black-oxide surface treatment offers enhanced corrosion protection, making these screws ideal for applications requiring durability in challenging operating conditions while maintaining precise Class 3A thread fit for consistent performance.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit precision and UNC coarse thread spacing in right-hand orientation. These inch-system fasteners meet ASTM A574 specifications for socket head cap screws and comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 5/8" fully threaded design maintains consistent diameter of 0.086" throughout the fastener length, ensuring reliable performance in industrial applications requiring high-strength fastening solutions.
