S-91205A709 1/2"-13 x 3/4" 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
- Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
- Exceptional vibration resistance through nylon patch thread locking, maintaining clamp force from -70° to 250°F
- Precise Class 3A thread fit ensures reliable engagement and reduces assembly issues in critical applications
- High tensile strength of 170,000 psi provides reliable performance under extreme mechanical loads
- Consistent hardness (Rockwell C37) delivers uniform performance and resistance to wear over time
- ASME B18.3 compliance guarantees dimensional accuracy and interchangeability with standard components
- 3/8" hex drive design enables secure tool engagement and efficient installation in confined spaces
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw addresses critical industrial fastening challenges where vibration resistance, high strength, and environmental durability are paramount. The 1/2"-13 UNC coarse thread with Class 3A fit provides rapid assembly in heavy machinery, automotive systems, and construction equipment, while the nylon patch thread locker maintains joint integrity despite constant vibration and thermal cycling from -70° to 250°F. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures reliable performance in high-stress applications, making it ideal for precision equipment, manufacturing fixtures, and structural assemblies requiring repeated disassembly and reassembly.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision dimensional control. Features 1/2"-13 UNC coarse threads and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The fastener meets ASTM A574 material standards and maintains consistent performance across the specified temperature range and mechanical requirements.
