S-91251A302 3/4"-16 x 4 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 provided by the black-oxide finish on alloy steel, extending service life
- Precise Class 3A thread fit ensures secure fastening and vibration resistance in critical assemblies
- High hardness rating (Rockwell C37) for excellent wear resistance and durability under load
- Optimized drive engagement with 5/8" hex socket for efficient installation and high torque transmission
- Fine UNRF threading delivers improved clamping force distribution and superior holding power
- Compliance with industry standards including ASTM A574, RoHS 3, and REACH for quality assurance
Professional Applications & Engineering Value
Engineered for demanding industrial environments, these socket head cap screws combine black-oxide alloy steel construction with precision UNRF fine threading to address critical fastening challenges. The Class 3A thread fit provides exceptional vibration resistance in machinery, automotive, and heavy equipment applications where loosening under dynamic loads is a concern. The partially threaded design allows for precise clamping force concentration while the 5/8" hex drive enables high-torque installation without stripping. Ideal for assembly lines requiring consistent performance, these fasteners deliver reliable corrosion resistance and maintain integrity in harsh operating conditions, reducing maintenance frequency and downtime.
Specification Summary & Compliance
This socket head cap screw features precision 3/4"-16 UNRF fine threads with Class 3A fit tolerance for superior thread engagement. Manufactured to ASTM A574 specifications, the fastener meets rigorous quality standards for material composition and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance adherence. The combination of 170,000 PSI tensile strength and Rockwell C37 hardness guarantees consistent performance in industrial applications requiring high-strength fastening solutions.
