S-91465A131 5/16"-18 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
- Enhanced torque application with external square drive head design for secure, slip-resistant installation using standard tools.
- Reliable load-bearing performance from ASTM Grade A steel construction, providing 60,000 psi tensile strength for low to medium-duty applications.
- Simplified alignment and faster assembly with coarse UNC threading and Class 2A fit, reducing cross-threading risks in industrial settings.
- Optimized grip and stability through partial threading, allowing unthreaded shank sections to bear shear loads effectively.
- Consistent durability with Rockwell B69 hardness, maintaining structural integrity under repeated stress.
- Broad compatibility with unified standard inch fastening systems, ensuring interchangeability across equipment and machinery.
- Environmental regulation compliance meeting RoHS 3 standards for safe use in regulated industries.
Professional Applications & Engineering Value
This 5/16"-18 UNC square head screw delivers critical engineering solutions where high torque application and structural reliability are paramount. Manufactured from ASTM Grade A steel, it addresses common industrial challenges like vibration loosening and misalignment through its coarse thread design and external square drive, which enables superior wrench grip. The partially threaded configuration allows the unthreaded portion to act as a precision pilot, minimizing material stress in assemblies. Ideal for machinery frames, construction equipment, and heavy-duty fixtures, this low-strength fastener provides a balanced combination of 60,000 psi tensile strength and controlled hardness (Rockwell B69), preventing brittleness while withstanding operational demands in manufacturing and maintenance environments.
Specification Summary & Compliance
This fastener adheres to Unified Standard Class 2A thread tolerances with 5/16"-18 UNC coarse threads and a 4" length. It conforms to ASTM A307 specifications for low-carbon steel bolts and is RoHS 3 (2015/863/EU) Compliant, ensuring alignment with international environmental and mechanical standards for industrial components.
