S-91268A127 1/4"-20 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
- Exceptional load-bearing capacity with 150,000 PSI tensile strength, ideal for high-stress industrial applications
- Superior wear resistance due to Rockwell C33 hardness, ensuring long-term durability in demanding environments
- Reliable coarse UNC threading for faster installation and reduced cross-threading risks in coarse materials
- Secure external hex drive providing high torque transmission and easy installation with standard tools
- Precision Class 2A thread fit ensuring consistent engagement and vibration resistance in assemblies
- Partial threading design offering optimal grip length for joint stability without unnecessary thread exposure
- Full regulatory compliance meeting ASME B18.2.1, SAE J429, 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 in construction, machinery assembly, and structural frameworks where high tensile strength is critical. The steel construction combined with Rockwell C33 hardness provides superior resistance to shear forces and environmental degradation. The 1/4"-20 UNC coarse thread configuration ensures rapid installation in various materials while maintaining vibration resistance through the Class 2A thread fit. The partially threaded design concentrates strength where needed most, preventing thread damage in non-critical sections. These external hex drive screws accommodate high-torque applications, making them ideal for maintenance, repair, and OEM operations requiring reliable fastening solutions under extreme conditions.
Specification Summary & Compliance
This Grade 8 hex head screw features precision Class 2A thread fit with 1/4"-20 UNC coarse threading and 3/4" minimum thread length. Manufactured to ASME B18.2.1 and SAE J429 specifications, ensuring dimensional accuracy and performance reliability. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for safe industrial use worldwide.
