S-91251A513 4-40 x 2 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 the risk of fastener failure.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding applications.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
- Partially threaded design allows for precise clamping force control and easier alignment in assemblies with varied material thicknesses.
- Rockwell C37 hardness delivers excellent wear resistance, maintaining thread integrity through repeated use and adjustments.
- Hex socket drive (3/32") enables high-torque installation with standard tools, minimizing stripping and improving installation efficiency.
- Coarse UNC threads facilitate quick assembly and disassembly, reducing labor time in maintenance and production settings.
Professional Applications & Engineering Value
This 4-40 UNC Socket Head Cap Screw is engineered to address critical challenges in precision machinery, automotive systems, and heavy-duty equipment. The black-oxide alloy steel construction combats corrosion and wear, while the Class 3A thread fit ensures leak-proof and vibration-resistant connections in dynamic environments. Its partially threaded configuration provides optimal grip in layered materials, preventing joint loosening. Ideal for applications requiring high tensile strength and repeatable performance, this screw meets rigorous industrial standards, offering reliability in assembly lines, robotics, and structural frameworks where fastener integrity is non-negotiable.
Specification Summary & Compliance
This screw adheres to Class 3A thread fit tolerances and UNC coarse thread spacing per standard specifications. It complies with ASTM A574 for material and manufacturing consistency, ensuring dimensional accuracy and performance. Environmental and safety regulations are met through RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming the absence of restricted substances for global industrial use.
