S-91205A591 5/16"-18 x 2" 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 demanding industrial environments.
- Exceptional tensile strength of 170,000 psi provides reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Vibration-resistant locking feature from the nylon patch thread locker maintains clamp load integrity from -70° to 250°F.
- Precision Class 3A thread fit ensures easy assembly and secure fastening in critical applications.
- High hardness (Rockwell C37) offers excellent wear resistance and durability for repeated use.
- Standard hex drive (1/4") allows for easy installation and removal with common tools, improving workflow efficiency.
- Compliance with ASME B18.3 and material standard ASTM A574 guarantees consistent quality and interchangeability.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. The nylon patch thread locker provides reliable resistance against spontaneous loosening in machinery and equipment subjected to dynamic loads, while the coarse UNC thread ensures quick assembly in production lines. Its partially threaded design offers optimal clamping force distribution, making it ideal for precision applications in automotive, aerospace, and heavy machinery. The combination of high tensile strength and temperature-resistant thread locker delivers long-term reliability, reducing maintenance downtime and enhancing operational safety in demanding environments.
Specification Summary & Compliance
This screw features a Class 3A thread fit for high precision, with UNC coarse thread (5/16"-18) and a minimum thread length of 1 3/8". It is manufactured in compliance with ASME B18.3 and material specification ASTM A574. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets stringent environmental and safety regulations for industrial use.
