S-91205A633 3/8"-16 x 2 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 performance with permanent Nylon Patch thread locker that maintains integrity from -70° to 250°F
- Exceptional tensile strength of 170,000 psi ensures reliable fastening in high-stress applications
- Precise Class 3A thread fit delivers superior engagement and consistent clamping force
- Black-oxide surface treatment on alloy steel provides enhanced corrosion resistance for extended service life
- Rockwell C37 hardness rating guarantees excellent wear resistance and durability
- Standard hex socket drive allows for high-torque installation in confined spaces
- Partially threaded design optimizes grip length while reducing weight in assembly applications
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw with Nylon Patch thread locker addresses critical vibration-induced loosening challenges in industrial machinery, automotive assemblies, and heavy equipment. The UNC coarse thread configuration ensures rapid installation and superior resistance to cross-threading, while the Class 3A thread fit provides precise tolerance control for consistent clamping force distribution. Engineered with 170,000 psi tensile strength and Rockwell C37 hardness, this fastener maintains structural integrity under extreme dynamic loads and temperature fluctuations from -70° to 250°F. The combination of alloy steel construction and black-oxide surface treatment delivers exceptional corrosion resistance, making it ideal for demanding environments where reliability and long-term performance are paramount.
Specification Summary & Compliance
This socket head cap screw features 3/8"-16 UNC coarse threads with Class 3A thread fit for precision engagement and meets ASME B18.3 dimensional specifications under ASTM A574 material standards. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial applications. Manufacturing adheres to strict quality controls for dimensional accuracy, thread geometry, and mechanical properties verification.
