S-91205A585 5/16"-18 x 1 1/4" 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 locking with permanent nylon patch thread locker that maintains secure fastening from -70° to 250°F
- Superior strength and durability from alloy steel construction with 170,000 psi tensile strength for heavy-duty applications
- Precise thread engagement with Class 3A UNC coarse threads ensuring reliable installation and reduced cross-threading risk
- Enhanced corrosion resistance through black-oxide surface treatment for extended service life in industrial environments
- Optimal torque transmission via hex socket drive design providing secure tool engagement and reduced cam-out
- Full thread coverage along the entire 1-1/4" length for maximum grip and load distribution
- Consistent performance backed by Rockwell C37 hardness rating for reliable mechanical properties
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages in demanding industrial settings where vibration resistance and structural integrity are paramount. The permanent nylon patch thread locker effectively prevents loosening under dynamic loads, making them ideal for machinery, automotive assemblies, and precision equipment subjected to constant stress cycles. The Class 3A UNC coarse threads provide excellent engagement in both metallic and high-strength plastic components, while the hex socket drive enables high-torque installation in confined spaces. Engineered with 170,000 psi tensile strength and Rockwell C37 hardness, these fasteners maintain clamping force under extreme conditions, preventing joint failure in critical applications where reliability cannot be compromised.
Specification Summary & Compliance
This socket head cap screw features precision 5/16"-18 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it delivers consistent performance across industrial applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and workplace safety standards are met.
