S-91205A115 4-40 x 1" 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 integrated nylon patch thread locker prevents loosening under dynamic loads and thermal cycling from -70° to 250°F
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications
- Superior corrosion protection through black-oxide coating on alloy steel extends service life in demanding environments
- Precision Class 3A thread fit guarantees consistent engagement and reliable fastening in critical assemblies
- Optimized drive efficiency with standard hex socket and 3/32" drive size enables secure torque application in confined spaces
- Industry-standard compliance with ASME B18.3 specifications ensures dimensional accuracy and interchangeability
- Partial threading design provides unthreaded shank for precise clamping and alignment in mechanical applications
Professional Applications & Engineering Value
Engineered for demanding industrial fastening applications, these socket head cap screws combine black-oxide alloy steel construction with advanced nylon patch thread locking technology to solve critical vibration and thermal stability challenges. The coarse UNC thread spacing and Class 3A thread fit ensure rapid installation and reliable performance in machinery, automotive, and aerospace assemblies where high-strength screws must maintain integrity under extreme conditions. The partially threaded configuration allows for precise bearing surface contact while the temperature-resistant locking mechanism secures joints across a wide operational range from -70° to 250°F, making these fasteners ideal for equipment subject to thermal expansion and mechanical stress.
Specification Summary & Compliance
Manufactured to ASME B18.3 dimensional standards with Class 3A thread fit precision for consistent engagement. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Meets ASTM A574 material specifications, delivering 170,000 psi tensile strength and Rockwell C37 hardness for reliable performance in critical applications.
