S-91251A987 7/16"-20 x 2 3/4" 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 ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments.
- Precision Class 3A threads provide a tighter fit and improved vibration resistance for secure assemblies.
- High hardness (Rockwell C37) enhances wear resistance and durability, minimizing thread damage during installation.
- Partially threaded design allows for precise clamping force control and easier alignment in applications.
- Fine UNRF thread profile offers better load distribution and sealing capabilities compared to coarse threads.
- 3/8" hex drive compatibility enables efficient installation with standard tools, reducing assembly time.
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these black-oxide alloy steel socket head cap screws deliver exceptional performance where reliability is critical. The Class 3A UNRF fine threads provide superior resistance to loosening under vibration, making them ideal for precision machinery, automotive assemblies, and heavy equipment. The partially threaded configuration ensures optimal grip length while preventing thread interference in through-holes. With 170,000 psi tensile strength and corrosion-resistant coating, they solve common challenges of fastener fatigue and environmental degradation in manufacturing, construction, and aerospace sectors where consistent clamping force and long-term durability are paramount.
Specification Summary & Compliance
This 7/16"-20 UNRF socket head cap screw maintains precise Class 3A thread fit with minimum thread length of 1-3/8" and overall length of 2-3/4". Manufactured to ASTM A574 specifications for high-strength alloy steel fasteners. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in regulated industries.
