S-91251A032 1/2"-20 x 5 1/2" 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.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, maintaining integrity in dynamic environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial conditions.
- Fine UNRF thread spacing delivers improved clamping force and better load distribution for critical assemblies.
- Partially threaded design allows for precise positioning and secure fastening without unnecessary thread engagement.
- Rockwell C37 hardness ensures high durability and wear resistance, minimizing deformation under heavy loads.
- 3/8" hex drive compatibility facilitates easy installation with standard tools, reducing assembly time and effort.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy machinery, automotive, and aerospace sectors where high tensile strength and vibration resistance are paramount. The Class 3A thread fit and UNRF fine threads ensure tight tolerances, preventing loosening under dynamic loads and reducing maintenance needs. Its partially threaded rod type allows for optimal grip in pre-tapped holes, while the corrosion-resistant black-oxide finish protects against environmental degradation. Ideal for precision assemblies requiring reliable fastening, this screw meets rigorous industrial standards, providing long-term performance in demanding applications.
Specification Summary & Compliance
This socket head cap screw adheres to Class 3A thread fit and UNRF fine thread standards with a thread size of 1/2"-20. Manufactured in accordance with ASTM A574 specifications, it ensures dimensional accuracy and mechanical reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and regulatory adherence for global industrial use.
