S-91251A327 5/16"-24 x 1 3/8" 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
- Enhanced corrosion resistance with black-oxide coating, extending service life in demanding industrial environments.
- Superior tensile strength of 170,000 psi ensures reliable performance under high-stress applications, reducing failure risks.
- Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
- Fine UNF threading (5/16"-24) offers improved load distribution and better sealing capabilities compared to coarse threads.
- Rockwell C37 hardness delivers excellent wear resistance, maintaining thread integrity through repeated use.
- 1/4" hex drive socket head allows for high-torque installation with standard tools, minimizing strip-out and improving assembly efficiency.
- Full compliance with ASTM A574, RoHS 3, and REACH guarantees material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and high mechanical stress. The fine UNF thread (5/16"-24) with Class 3A fit ensures minimal backlash and superior clamp load retention in precision equipment, automotive assemblies, and heavy machinery. The black-oxide surface treatment provides a durable barrier against moisture and chemicals, while the fully threaded design allows for consistent engagement across the entire length. Ideal for applications requiring high tensile strength (170,000 psi) and reliable performance in harsh environments, these screws reduce maintenance frequency and enhance operational safety.
Specification Summary & Compliance
This product meets Class 3A thread tolerances per UNF standards, ensuring precise fit and interchangeability. Manufactured in compliance with ASTM A574 for material consistency and performance. Fully adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental and health safety. Dimensions include 1-3/8" length, 1/4" hex drive, and right-hand fine threading for reliable industrial use.
