S-91268A203 5/16"-18 x 3" 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 150,000 PSI tensile strength for critical structural applications
- Superior wear resistance due to Rockwell C33 hardness, ensuring long service life in demanding environments
- Optimized thread engagement with partial threading design providing enhanced grip and vibration resistance
- Precise installation control through external hex drive and Class 2A thread fit for consistent torque application
- Heavy-duty construction using high-grade steel material capable of withstanding extreme mechanical stress
- Reliable coarse threading (UNC) that resists cross-threading and enables faster assembly in industrial settings
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for safe usage across global markets
Professional Applications & Engineering Value
Engineered for heavy machinery, structural steel connections, and industrial equipment assembly, these Grade 8 hex head screws address critical fastening challenges where failure is not an option. The combination of 150,000 PSI tensile strength and Rockwell C33 hardness provides exceptional resistance to dynamic loads and vibrational loosening in demanding applications. The 5/16"-18 UNC coarse thread configuration ensures rapid installation while maintaining secure connections in thick materials. Partial threading concentrates strength where needed most, preventing thread stripping while the external hex drive allows for high-torque installation using standard industrial tools. These heavy-duty steel screws deliver predictable performance in construction, manufacturing, and automotive applications where reliability under stress is paramount.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 and SAE J429 standards, these screws feature Class 2A thread fit tolerances for precise engagement. The 3" length with 7/8" minimum thread length provides optimal fastening depth. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental responsibility and global market acceptance.
