S-91251A887 7/8"-9 x 3 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 provides superior resistance to breaking and stripping under extreme loads.
- High hardness rating (Rockwell C37) ensures excellent wear resistance and long-term durability in demanding environments.
- Precise Class 3A thread fit guarantees reliable, vibration-resistant connections for critical assemblies.
- Black-oxide finish on alloy steel offers good corrosion resistance and a clean, professional appearance.
- Standard hex socket drive (3/4") allows for high-torque installation and removal in confined spaces.
- Partially threaded design provides an unthreaded shoulder for precise component positioning and shear resistance.
- Compliance with RoHS 3 and REACH ensures the screw meets stringent international environmental and safety standards.
Professional Applications & Engineering Value
This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to solve critical fastening challenges in heavy machinery, automotive, and construction equipment. Its high tensile strength and Rockwell C37 hardness prevent failure under dynamic loads and vibration, a common pain point in industrial applications. The UNRC coarse thread facilitates quicker assembly and is less prone to clogging with debris compared to fine threads. The combination of a partially threaded shank and Class 3A fit ensures that components are held securely without cross-threading, providing a reliable, long-lasting fastening solution that reduces maintenance downtime and improves overall assembly integrity.
Specification Summary & Compliance
This socket head cap screw features a 7/8"-9 UNRC coarse thread with a Class 3A thread fit for high precision. It is manufactured to meet the ASTM A574 specification for alloy steel socket head cap screws. The product is confirmed to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, adhering to strict environmental and substance regulations.
