S-91251A417 1"-14 x 2 1/4" 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 prolongs service life in harsh industrial environments, minimizing maintenance needs.
- Precision Class 3A thread fit provides tight tolerances and secure fastening, enhancing assembly integrity and vibration resistance.
- Fine UNRF threads offer improved load distribution and better sealing capabilities compared to coarse threads.
- High hardness (Rockwell C37) increases wear resistance, ensuring durability in repetitive or high-torque applications.
- Fully threaded design allows for adjustable grip length and consistent clamping force across the entire fastener.
- Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global industry standards.
Professional Applications & Engineering Value
This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty machinery, automotive, and aerospace sectors. The fine UNRF threads and Class 3A fit deliver superior vibration resistance and precise alignment, reducing loosening in dynamic loads. With a 170,000 psi tensile strength and Rockwell C37 hardness, it withstands extreme mechanical stresses while the black-oxide coating provides essential corrosion protection in humid or chemically aggressive environments. Ideal for high-torque applications using a 3/4" hex drive, this fully threaded fastener ensures uniform load distribution, making it a reliable choice for critical assembly systems requiring long-term reliability and compliance with international specifications.
Specification Summary & Compliance
This socket head cap screw adheres to Class 3A thread fit for precise dimensional accuracy and UNRF fine thread standards. Manufactured in compliance with ASTM A574 for material consistency, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.
