S-91251A882 7/8"-9 x 2 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 ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in demanding industrial environments.
- Precise Class 3A thread fit provides tight, secure fastening with minimal backlash for vibration-resistant assemblies.
- Coarse UNRC threads enable quicker installation and better debris clearance, saving time in maintenance and assembly.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Fully threaded design allows for adjustable clamping force and consistent engagement across the entire length.
- Compliance with RoHS 3 and REACH ensures environmental safety and meets global regulatory standards for industrial use.
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws are engineered to address critical challenges in heavy machinery, automotive, and construction sectors where high tensile strength and durability are paramount. The coarse UNRC threads with Class 3A fit provide superior grip in materials prone to vibration loosening, while the hex drive design allows for high-torque installation without stripping. Ideal for industrial applications requiring reliable fastening under extreme loads, these screws combine ASTM A574 material standards with a protective finish to resist oxidation, ensuring long-term performance in harsh conditions without compromising on RoHS and REACH compliance for safe, sustainable operations.
Specification Summary & Compliance
This socket head cap screw features a 7/8"-9 UNRC coarse thread with Class 3A thread fit for precise dimensional accuracy, fully threaded along a 2 1/2" length. Manufactured in accordance with ASTM A574 specifications, it meets stringent standards for material quality and performance. The product is RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, ensuring adherence to environmental and safety regulations for industrial fastener applications.
