S-91251A511 5/8"-18 x 7" 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
- Superior tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Black-oxide coating on alloy steel provides excellent corrosion resistance, extending service life in harsh environments.
- Precise Class 3A thread fit offers tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
- Partially threaded design with 1 3/4" minimum thread length allows for optimal grip and adjustment in varied material thicknesses.
- Fine UNF thread (5/8"-18) delivers enhanced holding power and improved load distribution compared to coarse threads.
- 1/2" hex drive socket head enables easy installation and removal with standard tools, reducing assembly time and effort.
- Rockwell C37 hardness ensures durability and wear resistance, maintaining integrity under repeated use.
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 construction sectors. Its fine UNF thread and Class 3A fit provide superior clamping force and vibration resistance, preventing joint failure in dynamic loads. The partially threaded rod type allows precise engagement in assemblies with non-uniform thickness, while the black-oxide surface treatment combats corrosion in humid or chemically aggressive environments. Ideal for high-stress applications, this fastener ensures long-term reliability, reducing maintenance downtime and enhancing operational safety in industrial settings.
Specification Summary & Compliance
This socket head cap screw features a 5/8"-18 UNF fine thread with Class 3A thread fit for high precision. It complies with ASTM A574 manufacturing standards, ensuring consistent quality and performance. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, supporting sustainable and safe usage in global supply chains.
