S-91251A812 5/8"-11 x 4 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 under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish prolongs service life in demanding industrial environments.
- Precise Class 3A thread fit guarantees secure, vibration-resistant connections for critical assemblies.
- High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNRC threading enables quick installation and reduced cross-threading risks in time-sensitive operations.
- Partially threaded design offers optimal clamping force distribution where full threading isn't required.
- 1/2" hex drive compatibility allows for high-torque installation with standard industrial tools.
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages in heavy machinery, automotive manufacturing, and structural applications where vibration resistance and high tensile strength are paramount. The UNRC coarse thread configuration combined with Class 3A thread fit ensures rapid assembly without compromising joint security, while the partially threaded design provides precise clamping control. The Rockwell C37 hardness rating makes these fasteners ideal for applications subject to repetitive stress cycles, and the black-oxide surface treatment offers enhanced corrosion protection without the dimensional changes associated with plating processes. These socket head cap screws solve common industrial challenges including fastener loosening under vibration, thread stripping during installation, and premature corrosion in harsh operating environments.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit tolerance for precision engagement. Features 5/8"-11 UNRC coarse threads with 0.625" thread diameter and 1-3/4" minimum thread length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. System of measurement: Inch with overall length of 4-1/2" and 1/2" hex drive compatibility.
