S-91251A448 1/4"-28 x 1 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 in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish prolongs service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides tight tolerances for secure, vibration-resistant assemblies, enhancing joint integrity.
- Fine UNRF threading offers improved load distribution and better sealing capabilities compared to coarse threads.
- Partially threaded design allows for controlled clamping force and easier alignment in precision machinery.
- Hex socket drive enables high-torque installation with standard tools, facilitating efficient assembly and disassembly.
- Compliance with ASTM A574 guarantees consistent quality and material properties for engineering-critical applications.
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these black-oxide alloy steel socket head cap screws deliver exceptional performance where precision and durability are paramount. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures reliable operation in high-vibration machinery, automotive assemblies, and heavy equipment. The fine UNRF threading with Class 3A fit provides superior resistance to loosening under dynamic loads, while the black-oxide surface treatment offers enhanced corrosion protection without compromising dimensional accuracy. These partially threaded fasteners are ideal for applications requiring precise clamp load control, such as in precision instruments, manufacturing fixtures, and aerospace components where consistent performance and regulatory compliance are critical.
Specification Summary & Compliance
This socket head cap screw features 1/4"-28 UNRF fine threading with Class 3A fit for precision assembly, manufactured to ASTM A574 specifications for consistent quality. The product is RoHS 3 (2015/863/EU) compliant and meets REACH (EC 1907/2006) requirements, ensuring environmental responsibility and regulatory adherence for global industrial applications.
