S-90044A137 1/4"-28 x 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 in demanding applications.
- Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
- Black-oxide coating on alloy steel offers enhanced corrosion resistance and durability, extending service life in harsh industrial environments.
- Fine UNF threading (1/4"-28) delivers improved clamping force and better load distribution, ideal for precision engineering applications.
- Rockwell C37 hardness ensures high wear resistance and maintains structural integrity under repetitive loads.
- Fully threaded design allows for maximum adjustability and uniform stress distribution along the entire length.
- Hex socket drive (3/16") enables easy installation with standard tools, reducing assembly time and improving efficiency.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The fine UNF thread with Class 3A fit ensures precise engagement in high-precision assemblies, minimizing backlash in machinery and equipment. Its high tensile strength and Rockwell C37 hardness make it suitable for heavy-duty applications in automotive, aerospace, and manufacturing sectors, where reliability under dynamic loads is critical. The black-oxide surface treatment provides an added layer of protection against corrosion, extending maintenance intervals and reducing downtime in corrosive environments.
Specification Summary & Compliance
This socket head cap screw features a 1/4"-28 UNF fine thread with Class 3A thread fit for high precision. It complies with ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting environmental and safety standards for industrial use.
