S-91205A102 4-40 x 3/16" 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 nylon patch thread locker maintains secure fastening in demanding applications from -70° to 250°F
- Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress industrial conditions
- Precise Class 3A thread fit provides superior engagement and consistent clamping force in critical assemblies
- Corrosion-resistant black-oxide finish on alloy steel extends service life in various operating environments
- Standard hex socket drive allows for easy installation with common tools while maintaining a low-profile head design
- Full threading along 3/16" length offers maximum adjustability and uniform load distribution
- Industry-compliant manufacturing meets ASME B18.3 and ASTM A574 specifications for guaranteed quality and interoperability
Professional Applications & Engineering Value
This 4-40 UNC thread socket head cap screw delivers critical vibration resistance and thermal stability for industrial equipment, machinery, and precision assemblies. The black-oxide alloy steel construction combined with Rockwell C37 hardness provides excellent durability against wear and moderate corrosion. The integrated nylon patch thread locker effectively prevents loosening under dynamic loads and thermal cycling from -70° to 250°F, eliminating the need for separate locking washers or adhesives. With its coarse UNC thread and Class 3A fit, this fully threaded fastener ensures rapid installation and reliable performance in right-hand thread applications where vibration resistance and high tensile strength are paramount.
Specification Summary & Compliance
This socket head cap screw features 4-40 UNC coarse threads with Class 3A precision tolerance for superior thread engagement. Manufacturing complies with ASME B18.3 dimensional standards and ASTM A574 material specifications. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting current environmental regulations for industrial use.
