S-91251A537 1/4"-20 x 1/2" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel 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 for reliable performance in high-stress applications
- Superior corrosion resistance from the black-oxide finish, extending service life in harsh environments
- Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
- High hardness rating (Rockwell C37) provides excellent wear resistance and durability
- Standard hex drive design allows for easy installation and removal with common tools
- Fully threaded construction offers consistent clamping force along the entire fastener length
- Compliance with multiple standards including ASTM A574 for quality assurance and RoHS/REACH for environmental safety
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw delivers exceptional engineering value for demanding industrial applications where reliability is paramount. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures these fasteners withstand extreme mechanical stresses without failure. The Class 3A UNRC coarse threads provide superior engagement in various materials while resisting loosening from vibration. The black-oxide surface treatment creates a protective barrier against corrosion, making these socket head cap screws ideal for machinery, automotive components, and industrial equipment operating in challenging environments. The hex drive design with 3/16" drive size enables efficient installation in confined spaces where wrench clearance is limited.
Specification Summary & Compliance
This 1/4"-20 x 1/2" socket head cap screw features precision Class 3A thread fit with UNRC coarse threads and fully threaded design. Manufactured to ASTM A574 specification for quality assurance, the fastener meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards for environmental safety. The dimensional specifications include 3/8" head diameter, 1/4" head height, and standard socket head profile with 3/16" hex drive for consistent performance across industrial applications.
