S-94688A326 1/2"-13 x 1 1/2" ASME B18.2.1 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
- Exceptional load-bearing capacity with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc yellow-chromate plating for extended service life in harsh environments
- Optimized torque transmission through external square drive design that prevents stripping during installation
- Precise thread engagement with Unified Standard Class 3A fit ensuring consistent, vibration-resistant connections
- Quick installation advantage from UNC coarse threading that reduces assembly time and prevents cross-threading
- Heavy-duty construction meeting SAE Grade 8 standards for demanding industrial applications
- Industry-standard compatibility with ASME B18.2.1 specifications guaranteeing proper fit and performance
Professional Applications & Engineering Value
Engineered for heavy machinery, structural assemblies, and industrial equipment, this Grade 8 square head screw delivers critical reliability where failure is not an option. The zinc yellow-chromate plating provides exceptional corrosion protection in outdoor or chemically aggressive environments, while the fully threaded UNC coarse pattern ensures maximum grip length and rapid installation. The external square drive design offers superior torque transmission compared to standard hex heads, preventing tool slippage during high-torque applications. With 150,000 psi tensile strength, these high-strength screws maintain structural integrity under extreme vibrational loads and dynamic stresses common in construction, manufacturing, and heavy equipment applications.
Specification Summary & Compliance
This 1/2"-13 UNC square head screw features Unified Standard Class 3A thread fit for precision engagement and maintains dimensional accuracy per ASME B18.2.1 specifications. The coarse thread spacing and right-hand threading provide industry-standard compatibility, while the SAE Grade 8 classification guarantees consistent mechanical properties. Manufactured from high-grade steel with zinc yellow-chromate plating for corrosion protection, this fastener meets rigorous industrial standards for quality and performance in demanding applications.
