S-90128A376 1/4"-28 x 1 1/4" 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 corrosion resistance with zinc plating, extending service life in demanding industrial environments
- Superior tensile strength (170,000 PSI) ensures reliable performance under high-stress applications
- Precision Class 3A thread fit provides secure, vibration-resistant connections in critical assemblies
- Fine UNF threading (1/4"-28) offers enhanced load distribution and improved adjustment accuracy
- Rockwell C37 hardness rating maintains structural integrity and prevents thread deformation
- Hex socket drive design enables high-torque installation in confined spaces with standard tools
- Full threading along 1 1/4" length allows maximum engagement depth and positioning flexibility
Professional Applications & Engineering Value
These zinc-plated alloy steel socket head cap screws address critical engineering challenges in precision manufacturing and heavy machinery applications. The combination of 170,000 PSI tensile strength and Class 3A UNF fine threads provides exceptional clamping force while resisting loosening under vibration - a common failure point in industrial equipment. The hex socket drive system allows for precise torque application in confined spaces where traditional wrench access is limited. Manufactured to ASTM A574 specifications, these fully threaded fasteners deliver consistent performance in automotive assemblies, aerospace components, and precision machinery where dimensional accuracy and reliability are paramount. The corrosion-resistant zinc plating further enhances durability in environments exposed to moisture or chemicals.
Specification Summary & Compliance
This socket head cap screw features precision 1/4"-28 UNF fine threads with Class 3A fit, ensuring tight tolerances for high-precision applications. The fastener meets ASTM A574 specifications for high-strength alloy steel socket head cap screws and demonstrates compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. With a Rockwell C37 hardness rating and 170,000 PSI tensile strength, this fully threaded fastener maintains dimensional stability and mechanical properties across demanding industrial applications.
