S-91205A548 1/4"-20 x 1 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
- Vibration-resistant locking with integrated Nylon Patch thread locker prevents loosening under dynamic loads in temperatures from -70° to 250°F
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications
- Precision Class 3A thread fit provides superior engagement and reduces the risk of cross-threading during assembly
- Corrosion-resistant Black-Oxide finish on alloy steel extends service life in demanding environments
- Partially threaded design allows for precise clamping force control where full threading isn't required
- Standard hex socket drive with 3/16" key size enables high-torque installation in confined spaces
- Industry-standard compliance with ASME B18.3 and ASTM A574 ensures consistent quality and interchangeability
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these socket head cap screws combine Black-Oxide alloy steel construction with Nylon Patch thread locking technology to solve critical fastening challenges. The UNC coarse thread profile with Class 3A fit ensures rapid assembly and reliable performance in machinery, automotive, and heavy equipment where vibration resistance is paramount. The partially threaded design provides optimal clamping force distribution while the 170,000 psi tensile strength and Rockwell C37 hardness guarantee structural integrity under extreme loads. These high-strength cap screws deliver consistent performance in temperature-fluctuating environments from -70° to 250°F, making them ideal for precision engineering applications requiring secure, long-term fastening solutions.
Specification Summary & Compliance
This 1/4"-20 x 1 3/4" socket head cap screw features Class 3A thread fit with UNC coarse threads and minimum thread length of 1 1/4". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it meets rigorous industrial standards. The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental responsibility and regulatory adherence for global industrial applications.
