S-91205A198 8-32 x 7/8" 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
- Secure vibration-resistant locking with the integrated nylon patch, maintaining fastener integrity across a wide temperature range from -70°F to 250°F
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications and heavy machinery
- Superior corrosion resistance thanks to the black-oxide finish on alloy steel, extending service life in demanding environments
- Precise Class 3A thread fit provides tighter tolerances for improved assembly accuracy and reduced risk of cross-threading
- Optimal torque transmission through the standard hex socket drive (9/64") prevents stripping and allows for high clamping forces
- Full threading along the 7/8" length offers maximum adjustment flexibility and uniform load distribution across the entire fastener
- Consistent performance assurance through compliance with ASME B18.3 manufacturing standards and material specifications (ASTM A574)
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws with 8-32 UNC coarse threads and nylon patch thread locker address critical challenges in industrial assembly where vibration loosening and material failure are common concerns. The combination of 170,000 psi tensile strength and Rockwell C37 hardness provides exceptional resistance to shear and tensile forces in heavy machinery, automotive components, and precision equipment. The fully threaded design ensures maximum engagement in tapped holes, while the standard hex socket drive facilitates installation in confined spaces with controlled torque application. This engineering solution prevents costly downtime by maintaining joint integrity in applications subject to thermal cycling and dynamic loads.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with ASTM A574 alloy steel material, these screws feature Class 3A thread fit for precision assembly with 8-32 UNC coarse threads and right-hand thread direction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
