S-91251A227 1/2"-20 x 3 3/4" 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 under high-stress conditions, reducing failure risks in demanding applications.
- Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in harsh industrial environments.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
- Partially threaded design allows for controlled clamping force and easier alignment in machinery and structural components.
- Fine thread spacing (UNRF) offers improved adjustment accuracy and better load distribution compared to coarse threads.
- Hex socket drive compatibility with 3/8" tools enables efficient installation in confined spaces with high torque application.
- Compliance with ASTM A574 guarantees consistent quality and material integrity for critical engineering projects.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw addresses common industrial challenges such as vibration-induced loosening and environmental degradation. The UNRF fine thread configuration ensures superior holding power in precision equipment, while the Rockwell C37 hardness provides excellent wear resistance for repetitive assembly cycles. Ideal for heavy-duty machinery, automotive systems, and aerospace components, its partially threaded rod type allows exact positioning without compromising structural integrity. The hex drive style facilitates quick maintenance in tight spaces, reducing downtime in production environments where reliability is paramount.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit ensuring precision tolerance in inch measurements. The screw features 1/2"-20 UNRF fine threads with minimum 1-1/2" thread length and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards for safe industrial use worldwide.
