S-91286A223 3/8"-16 x 3 3/4" 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 for reliable performance in demanding applications
- Superior corrosion protection through zinc-flake coating, extending service life in harsh industrial environments
- High-grade material strength meeting Grade 8 specifications with Rockwell C33 hardness for maximum durability
- Secure fastening performance with Class 2A thread fit and UNC coarse threading for vibration resistance
- Optimized torque transmission through external hex drive design and 9/16" head width for easy installation
- Versatile partial threading allowing both clamping and alignment functions in structural assemblies
- Full regulatory compliance with ASME B18.2.1, SAE J429 standards plus RoHS 3 and REACH environmental directives
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical performance 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 configuration ensures rapid installation and reliable holding power in structural steel connections, heavy machinery, and industrial equipment. The partially threaded design combines the benefits of both threaded and unthreaded sections, allowing for precise clamping force distribution and alignment in critical joints. With 150,000 psi tensile strength and Rockwell C33 hardness, these fasteners withstand extreme mechanical stresses in construction, manufacturing, and automotive applications where failure is not an option.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNC coarse thread specifications ensuring consistent performance. Complies with ASME B18.2.1 and SAE J429 standards for hex head screws, with full conformance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 3 3/4" length with 1" minimum thread length provides optimal engagement for secure fastening in various material thicknesses.
