S-91465A230 5/8"-11 x 6" ASTM A307 Square Head Screws
Square 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 torque transmission with external square drive design for secure installation and reduced tool slippage in high-torque applications
- Reliable performance in demanding environments thanks to ASTM Grade A steel construction with 60,000 psi tensile strength
- Optimized for quick assembly with UNC coarse threading that resists cross-threading and simplifies alignment
- Precise thread engagement ensured by Unified Standard Class 2A fit for consistent fastening performance
- Enhanced durability with Rockwell B69 hardness providing excellent resistance to wear and deformation
- Versatile partial threading allowing unthreaded shank sections for shear strength in structural connections
- Environmental compliance assurance with RoHS 3 (2015/863/EU) compliance for international industrial applications
Professional Applications & Engineering Value
These 5/8"-11 UNC square head screws deliver exceptional engineering value for heavy-duty industrial applications where reliability is paramount. The ASTM A307 Grade A steel construction provides the ideal balance of strength and ductility, preventing brittle failure under dynamic loads commonly encountered in construction and machinery assembly. The coarse UNC threading offers superior performance in materials prone to vibration loosening, while the partially threaded design creates a bearing surface that enhances joint stability. The external square drive enables high-torque installation without cam-out issues, making these screws particularly valuable for structural steel connections, heavy equipment maintenance, and industrial machinery where Rockwell B69 hardness ensures long-term performance despite repeated stress cycles.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with Class 2A thread fit tolerance for consistent engagement. These square head screws comply with ASTM A307 specifications for low carbon steel fasteners and feature UNC coarse thread form with 5/8"-11 threading. The screws are RoHS 3 (2015/863/EU) compliant for environmental safety and manufactured to industrial standards suitable for construction and machinery applications requiring 60,000 psi tensile strength performance.
