S-91205A060 2-56 x 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
- Permanent vibration resistance with nylon patch thread locker, ensuring secure assemblies in high-stress environments
- Exceptional tensile strength of 170,000 psi for reliable performance in demanding mechanical applications
- Wide temperature tolerance from -70° to 250°F, maintaining integrity in extreme operating conditions
- Superior corrosion protection through black-oxide coating on alloy steel, extending service life
- Precise Class 3A thread fit for smooth installation and consistent clamping force in UNC coarse threads
- Hex socket drive compatibility with 5/64" key, allowing high-torque installation in confined spaces
- Full threading along 1/4" length providing maximum engagement and adjustment flexibility
Professional Applications & Engineering Value
These socket head cap screws with nylon patch thread locking technology solve critical vibration-induced loosening problems in industrial equipment, automotive assemblies, and precision machinery. The black-oxide alloy steel construction combined with Rockwell C37 hardness delivers optimal strength-to-weight ratio while resisting corrosion in harsh environments. Engineered with UNC coarse threads and Class 3A fit, these fasteners ensure rapid assembly and reliable performance in high-vibration applications where maintenance access is limited. The fully threaded design maximizes load distribution while the temperature-resistant nylon patch maintains locking effectiveness across extreme thermal cycles.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit tolerance for precision UNC threading. These socket head cap screws meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, ensuring environmental responsibility. The black-oxide alloy steel construction provides consistent performance with 170,000 psi tensile strength and Rockwell C37 hardness, backed by ASTM A574 material specifications for reliable industrial use.
