S-90117A275 1/2"-20 x 1 3/4" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws
Alloy Steel Wire-Lockable 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
- Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in harsh industrial environments.
- Precise Class 3A thread fit guarantees tight, secure connections with minimal backlash for vibration-resistant assemblies.
- Fine UNF threading (1/2"-20) provides increased adjustment accuracy and improved load distribution compared to coarse threads.
- Hex socket drive design allows for high-torque installation in confined spaces with standard 3/8" tools.
- Full threading along the 1-3/4" length offers versatile positioning and consistent clamping force across the entire fastener.
- Wire locking capability enhances security in dynamic applications where vibration loosening is a concern.
Professional Applications & Engineering Value
Engineered for demanding industrial fastening scenarios, this socket head cap screw combines black-oxide alloy steel construction with fine UNF threads to address critical engineering challenges. The Class 3A thread fit ensures exceptional dimensional accuracy, eliminating play in precision machinery, automotive assemblies, and aerospace components. Its 170,000 psi tensile strength and Rockwell C37 hardness provide dependable performance under extreme loads, while the corrosion-resistant surface treatment prolongs service life in humid or chemically aggressive environments. The hex drive facilitates efficient installation in tight spaces, making it ideal for maintenance-intensive equipment where reliability and ease of service are paramount.
Specification Summary & Compliance
This fastener maintains Class 3A thread tolerances per UNF standards, with full compliance to ASME B18.3 manufacturing specifications. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries. The fully threaded design and right-hand thread direction adhere to industry norms for consistent performance across applications.
