S-91205A552 1/4"-20 x 2 1/2" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws
Alloy Steel Thread-Locking Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Vibration-resistant locking with nylon patch thread locker maintains secure fastening from -70° to 250°F, preventing loosening in dynamic environments
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications and heavy machinery
- Superior thread precision with Class 3A fit provides consistent engagement and reduced risk of cross-threading during assembly
- Corrosion-resistant black-oxide finish on alloy steel extends service life in demanding industrial conditions
- Optimized socket head design with hex drive allows high torque application and access in confined spaces
- Partially threaded shank enables precise clamping force distribution where full threading isn't required
- Industry-standard compliance with ASME B18.3 ensures interchangeability and reliable performance across applications
Professional Applications & Engineering Value
Engineered for demanding industrial applications, this socket head cap screw combines black-oxide alloy steel construction with advanced nylon patch thread locking technology to solve critical fastening challenges. The UNC coarse thread profile with Class 3A precision ensures rapid assembly and reliable performance in vibration-prone equipment, manufacturing machinery, and automotive systems. With a Rockwell C37 hardness rating and 170,000 psi tensile strength, this fastener maintains integrity under extreme loads while the temperature-resistant thread locker prevents spontaneous loosening in thermal cycling environments from -70° to 250°F. The partially threaded design provides optimal stress distribution in structural connections and precision equipment where controlled clamping force is essential.
Specification Summary & Compliance
This 1/4"-20 UNC thread socket head cap screw features Class 3A thread fit precision with 2-1/2" length and 1" minimum thread length. Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, making it suitable for global industrial applications requiring certified components.
