S-91286A377 1/2"-20 x 2 1/2" 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 load-bearing capability with 150,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion protection through zinc-flake coating that withstands harsh industrial environments
- Precise thread engagement with Class 2A fit and UNF fine threads ensuring vibration resistance and secure fastening
- Optimized drive efficiency featuring external hex design for high torque application and easy installation
- Enhanced durability from Rockwell C33 hardness that maintains integrity under repeated stress
- Versatile partial threading allowing both clamping and alignment functions in structural assemblies
- Regulatory compliance assurance meeting ASME, SAE, RoHS 3 and REACH standards for global project acceptance
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver critical engineering solutions where high tensile strength and corrosion resistance are paramount. The zinc-flake coated steel construction provides exceptional protection against environmental degradation in outdoor construction, heavy machinery, and structural steel applications. The 1/2"-20 UNF fine threading with Class 2A fit ensures precise engagement that resists loosening under vibration, while the external hex drive enables high-torque installation in confined spaces. The partially threaded design offers optimal clamping force distribution, making these industrial screws ideal for critical joints in framework, equipment mounting, and load-bearing assemblies where failure is not an option.
Specification Summary & Compliance
Manufactured to exacting ASME B18.2.1 and SAE J429 specifications with Class 2A thread fit tolerance. Features 1/2"-20 UNF fine threads with minimum 1-1/4" thread length on 2-1/2" overall length. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global manufacturing applications.
