S-91465A179 1/2"-13 x 3 1/2" 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
- High tensile strength of 60,000 psi provides reliable load-bearing capacity for demanding industrial applications
- ASTM Grade A certification ensures consistent quality and performance in structural fastening scenarios
- External square drive design delivers superior torque transmission and prevents tool slippage during installation
- Coarse UNC threading enables faster installation and better resistance to vibration loosening
- Partially threaded configuration allows for precise clamping force control in assembly operations
- RoHS 3 compliance guarantees environmental safety and regulatory acceptance in global markets
- Rockwell B69 hardness maintains thread integrity and durability through repeated use cycles
Professional Applications & Engineering Value
This 1/2"-13 UNC square head screw delivers exceptional engineering value in heavy machinery, structural steel connections, and industrial equipment assembly. The ASTM A307 Grade A steel construction provides the optimal balance of strength and ductility, preventing brittle failure under dynamic loads. The external square drive eliminates cam-out issues common with Phillips drives, while the coarse thread pitch maintains secure fastening in vibration-prone environments. The partially threaded design concentrates clamping force precisely where needed, making it ideal for construction applications requiring unified standard Class 2A thread fit for reliable, repeatable installations.
Specification Summary & Compliance
This square head screw features Unified Standard Class 2A thread fit with precise dimensional accuracy per inch system requirements. Manufactured to ASTM A307 specifications with 1/2"-13 UNC coarse threads and right-hand threading orientation. The fastener maintains RoHS 3 (2015/863/EU) compliance for environmental safety and meets all specified mechanical properties including 60,000 psi tensile strength and Rockwell B69 hardness ratings for consistent performance in industrial applications.
