S-91268A161 1/4"-20 x 5" 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
- Exceptional tensile strength of 150,000 PSI ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
- Grade 8 steel construction with Rockwell C33 hardness provides superior durability and resistance to wear, extending service life in demanding environments.
- Coarse UNC threading with Class 2A fit offers faster assembly and better resistance to vibration loosening compared to fine threads.
- Partial threading design allows for precise clamping force control, ideal for applications where unthreaded shank strength is critical.
- External hex drive enables high-torque installation with standard tools, ensuring secure fastening in confined spaces.
- Full compliance with ASME B18.2.1 standards guarantees dimensional accuracy and interchangeability, streamlining procurement and replacement.
- RoHS 3 and REACH environmental compliance ensures safe use in regulated industries without hazardous substance restrictions.
Professional Applications & Engineering Value
Engineered for heavy-duty industrial applications, these Grade 8 hex head screws deliver critical reliability in machinery, structural assemblies, and equipment subjected to dynamic loads. The 1/4"-20 UNC coarse thread provides excellent engagement in metals and plastics, while the partial threading prevents thread damage in through-holes and maintains shank integrity. With 150,000 PSI tensile strength and Rockwell C33 hardness, they resist shear and fatigue in construction, automotive, and manufacturing setups where vibration and high stress are common. The external hex drive facilitates quick installation with common wrenches, reducing assembly time and ensuring consistent clamping force in industrial screw applications.
Specification Summary & Compliance
This 5-inch hex head screw features a 1/4"-20 UNC thread with Class 2A thread fit for precise dimensional tolerance, manufactured to ASME B18.2.1 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability.
