S-91465A128 5/16"-18 x 3" 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
- Enhanced torque application with external square drive design for secure installation in demanding environments
- Superior material reliability through ASTM Grade A steel construction ensuring consistent performance
- Optimized thread engagement with Unified Standard Class 2A fit providing secure fastening with standard nuts
- Reduced cross-threading risk through coarse UNC thread spacing for quicker assembly in industrial settings
- Precise length control with 3" dimension and partial threading for specific depth applications
- Environmental compliance assurance with RoHS 3 compliance meeting international regulatory standards
- Balanced strength characteristics offering 60,000 psi tensile strength with Rockwell B69 hardness for durable performance
Professional Applications & Engineering Value
This 5/16"-18 UNC square head screw delivers exceptional engineering value for industrial assembly applications where reliable torque transmission and environmental compliance are critical. The ASTM A307 Grade A steel construction provides optimal strength-to-weight ratio while the external square drive enables high-torque installation without cam-out issues common in Phillips drives. The coarse thread spacing ensures rapid assembly in wood, metal, and construction applications where vibration resistance is paramount. Partially threaded design allows for precise clamping force distribution, making these square head screws ideal for machinery, structural connections, and heavy equipment maintenance where Unified Standard Class 2A thread fit guarantees compatibility with standard components.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Unified Standard Class 2A thread fit ensuring consistent performance across applications. The fastener meets ASTM A307 specifications for low-strength applications and complies with RoHS 3 (2015/863/EU) regulations for environmental safety. Thread specifications include 5/16"-18 UNC coarse spacing with 0.3125" diameter and minimum 7/8" thread length. Material certification includes 60,000 psi tensile strength and Rockwell B69 hardness verification, providing documented traceability for quality-critical industrial applications.
