S-91247A932 1"-8 x 8" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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
- Exceptional tensile strength of 120,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Superior corrosion resistance from zinc plating extends service life in harsh industrial or outdoor environments.
- High hardness rating (Rockwell C25) provides excellent wear resistance and maintains thread integrity during repeated use.
- Coarse UNC threading enables faster installation and better performance in softer materials or where vibration resistance is critical.
- Precise Class 2A thread fit ensures consistent engagement and proper clamping force without galling or cross-threading issues.
- External hex drive design allows for high-torque installation using standard tools, speeding up assembly processes.
- Partial threading configuration provides optimal grip length while minimizing weight and material usage.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial and construction applications, these Grade 5 hex head screws deliver critical performance where structural integrity is paramount. The zinc plated steel construction combats corrosion in demanding environments, from manufacturing facilities to outdoor infrastructure projects. The 1"-8 UNC coarse thread design provides superior pull-out resistance in wood, metal, and composite materials, while the external hex drive accommodates high-torque installation for secure fastening. With partial threading optimizing the grip length, these screws prevent joint loosening under vibration, making them ideal for machinery assembly, structural steel connections, and heavy equipment manufacturing where reliability cannot be compromised.
Specification Summary & Compliance
This 1"-8 UNC hex head screw features Class 2A thread fit tolerances for precise engagement and meets ASME B18.2.1 and SAE J429 Grade 5 specifications for dimensional accuracy and mechanical properties. The fastener is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors.
