S-91251A322 1"-14 x 4 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, minimizing loosening in dynamic environments.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in various industrial conditions.
- 3/4" hex drive and standard socket head allow for high-torque installation and easy access in confined spaces, improving assembly efficiency.
- UNRF fine thread design delivers better clamping force distribution and improved fatigue resistance compared to coarse threads.
- Rockwell C37 hardness balances durability and machinability, preventing brittleness while maintaining structural integrity.
- Partial threading provides an unthreaded shoulder for precise alignment and shear strength in assembled components.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty machinery, automotive systems, and precision equipment. The UNRF fine thread with Class 3A fit ensures tight tolerances and secure fastening in high-vibration environments, preventing operational downtime. The 170,000 psi tensile strength and Rockwell C37 hardness provide resilience under extreme loads, making it ideal for structural frames, engine components, and industrial tools. Its partially threaded design offers enhanced shear resistance, while the black-oxide surface treatment protects against rust and wear in harsh conditions, ensuring long-term reliability and reduced maintenance costs.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit for precise dimensional accuracy and UNRF fine thread standards with 1"-14 spacing. It meets ASTM A574 specifications for high-strength alloy steel and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.
