S-91247A855 3/4"-10 x 5" 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 demanding applications, reducing the risk of fastener failure.
- Zinc plating provides superior corrosion resistance, extending service life in harsh industrial environments.
- Grade 5 classification and Rockwell C25 hardness offer a robust balance of strength and durability for high-stress assemblies.
- Coarse UNC thread and Class 2A fit enable faster installation and easier alignment, saving valuable assembly time.
- Partially threaded design with a 1 3/4" minimum thread length provides optimal grip and clamping force where it's needed most.
- External hex drive and standard hex head allow for high-torque application with common tools, ensuring secure fastening.
- Compliance with ASME B18.2.1, RoHS 3, and REACH guarantees product quality, safety, and environmental responsibility for global supply chains.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to solve critical fastening challenges in heavy machinery, structural steelwork, and industrial equipment assembly. The zinc plated steel construction combats corrosion, a common failure point in outdoor or high-moisture environments, while the coarse UNC thread resists loosening under vibration. With a partially threaded shank, it concentrates clamping force precisely, preventing joint slippage in dynamic loads. Its 120,000 psi tensile strength and external hex drive make it ideal for applications requiring both high torque capability and reliable, long-term performance, minimizing maintenance downtime and replacement costs.
Specification Summary & Compliance
This fastener features a 3/4"-10 UNC coarse thread with Class 2A thread fit for standard tolerance and interchangeability. It is manufactured to meet ASME B18.2.1 and SAE J429 Grade 5 specifications, ensuring dimensional accuracy and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances and safe for industrial use.
