S-91286A208 3/8"-16 x 2" 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 with 150,000 psi rating ensures reliable performance in high-stress applications
- Superior corrosion resistance provided by zinc-flake coating extends service life in demanding environments
- Precise Class 2A thread fit guarantees smooth installation and secure fastening in industrial assemblies
- Heavy-duty Grade 8 construction with Rockwell C33 hardness delivers maximum durability and load-bearing capacity
- External hex drive design allows for high-torque installation using standard tools without stripping
- Coarse UNC threading provides excellent engagement and vibration resistance in various materials
- Partial threading configuration offers optimal clamping force distribution for structural applications
Professional Applications & Engineering Value
These Grade 8 hex head screws are engineered to address critical challenges in heavy machinery, construction equipment, and industrial assembly applications where high tensile strength and corrosion resistance are paramount. The zinc-flake coated steel construction provides superior protection against environmental degradation, while the 3/8"-16 UNC coarse thread design ensures rapid installation and exceptional vibration resistance. The partially threaded configuration allows for precise clamping force distribution, making these external hex drive fasteners ideal for structural connections, equipment manufacturing, and maintenance operations requiring reliable, high-strength fastening solutions that withstand extreme mechanical stresses.
Specification Summary & Compliance
Manufactured to exacting Class 2A thread fit tolerances with UNC coarse threading (3/8"-16), these hex head screws comply with ASME B18.2.1 and SAE J429 Grade 8 specifications. The fasteners maintain full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet the highest standards for industrial use while providing consistent dimensional accuracy and mechanical performance across all applications.
