S-91251A721 1/2"-13 x 2 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 applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
- Precise Class 3A thread fit provides secure, vibration-resistant connections, minimizing loosening in dynamic operations.
- Hex socket drive design allows for high-torque installation with standard tools, facilitating quick and efficient assembly.
- Partially threaded shank offers optimal grip and alignment, ideal for clamping materials without thread interference.
- Compliance with RoHS 3 and REACH ensures environmental and safety standards are met for global industrial use.
- Rockwell C37 hardness delivers excellent wear resistance, maintaining integrity under repeated loads.
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws are engineered to address critical challenges in demanding sectors like machinery, automotive, and heavy equipment. The 1/2"-13 UNC coarse thread and Class 3A fit ensure rapid assembly and secure fastening, even in high-vibration environments, reducing maintenance downtime. The hex drive design enables easy access in confined spaces, while the partially threaded rod prevents cross-threading and improves joint stability. Ideal for applications requiring high tensile strength and durability, these screws support robust construction without compromising on industrial safety standards.
Specification Summary & Compliance
This product adheres to ASTM A574 specifications, with precise Class 3A thread fit and UNC coarse threads for consistent performance. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring environmental and health safety. Dimensions include a 2-1/4" length, 1/2"-13 thread size, and 3/8" hex drive, manufactured to exact tolerances for reliable industrial use.
