S-91205A669 1/4"-28 x 1 1/2" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws
Alloy Steel Thread-Locking 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
- Vibration-resistant fastening with nylon patch thread locker that maintains integrity across a wide temperature range from -70°F to 250°F
- Superior tensile strength rated at 170,000 psi for demanding applications requiring high load-bearing capacity
- Precision Class 3A thread fit ensures consistent engagement and reliable performance in critical assemblies
- Enhanced corrosion protection through black-oxide coating on alloy steel, extending service life in industrial environments
- Optimized drive efficiency with hex socket head design allowing high torque application and secure installation
- Fine thread spacing provides improved adjustment precision and better resistance to loosening under dynamic loads
- Partial threading design offers versatile fastening solutions where unthreaded shank sections are required
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver exceptional engineering value in applications where vibration resistance and precise alignment are critical. The combination of Class 3A UNF fine threads and nylon patch thread locking technology addresses common industrial challenges of fastener loosening in machinery, automotive components, and precision equipment. The partially threaded design allows for precise clamping force distribution, while the hex socket drive enables installation in confined spaces. With Rockwell C37 hardness and superior tensile characteristics, these fasteners prevent thread stripping and maintain joint integrity in high-stress environments, making them ideal for manufacturing equipment, aerospace assemblies, and heavy machinery where reliability cannot be compromised.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNF fine thread spacing. These socket head cap screws meet ASTM A574 material standards and comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 1/4"-28 UNF thread with minimum 1" thread length ensures consistent performance across industrial applications.
