S-91257A720 1/2"-13 x 2" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex 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
- Maximum load-bearing capability with Grade 8 classification and 150,000 psi tensile strength for critical structural applications
- Superior corrosion protection through zinc yellow-chromate plating that withstands harsh industrial environments
- Optimized thread engagement with Class 2A UNC coarse threads ensuring reliable installation and vibration resistance
- Enhanced durability from Rockwell C33 hardness providing excellent wear resistance and long service life
- Secure external hex drive allowing high torque application with standard tools for efficient assembly
- Partial threading design offering both gripping strength and unthreaded shank stability in demanding applications
- Full regulatory compliance meeting ASME, SAE, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver exceptional performance where failure is not an option. The zinc yellow-chromate plated steel construction provides superior corrosion resistance in demanding environments while maintaining 150,000 psi tensile strength. The 1/2"-13 UNC coarse threads with Class 2A fit ensure rapid installation and secure fastening in structural steel, machinery, and equipment assembly. The partially threaded design combines the benefits of maximum thread engagement with unthreaded shank strength, making these external hex drive screws ideal for vibration-prone applications requiring reliable, long-term fastening solutions.
Specification Summary & Compliance
Manufactured to precise inch system measurements with 2" length and 1/4" minimum thread length. Thread specifications include 1/2"-13 UNC coarse spacing with Class 2A thread fit for consistent performance. Complies with ASME B18.2.1 and SAE J429 Grade 8 standards, ensuring dimensional accuracy and mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for unrestricted industrial use worldwide.
