S-91465A221 5/8"-11 x 4" 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 reliable installation in high-torque applications
- Exceptional durability through ASTM Grade A steel construction with Rockwell B69 hardness rating
- Reliable load-bearing capacity with 60,000 psi tensile strength for demanding industrial environments
- Optimized thread engagement through Unified Standard Class 2A thread fit ensuring consistent performance
- Enhanced environmental compliance with RoHS 3 (2015/863/EU) certification for restricted substance-free operation
- Versatile partial threading allowing both clamping and unthreaded shank benefits in various assembly scenarios
- Industry-standard compatibility with 5/8"-11 UNC coarse threads for broad application across equipment and machinery
Professional Applications & Engineering Value
This 5/8"-11 UNC square head screw delivers critical engineering solutions for industrial fastening challenges where high torque application and structural integrity are paramount. The external square drive configuration provides superior resistance to cam-out during installation, while the ASTM Grade A steel construction ensures consistent performance under mechanical stress. The coarse thread design enables faster assembly in soft materials and corrosion-prone environments, reducing installation time and maintenance requirements. With partial threading, this fastener offers optimal clamping force distribution while maintaining unthreaded shank strength, making it ideal for construction equipment, heavy machinery, and structural applications where vibration resistance and long-term reliability are essential.
Specification Summary & Compliance
This square head screw maintains Unified Standard Class 2A thread fit tolerances for precise engagement and features 5/8"-11 UNC coarse threading with right-hand orientation. Manufactured to ASTM A307 specifications, the fastener delivers consistent mechanical properties including 60,000 psi tensile strength and Rockwell B69 hardness. The product is fully RoHS 3 (2015/863/EU) compliant, ensuring environmental regulatory adherence for industrial applications worldwide.
