S-91286A351 1/2"-13 x 5" 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 high-stress applications
- Superior corrosion resistance through zinc-flake coating, extending service life in harsh industrial environments
- Precise thread engagement with Class 2A UNC coarse threads ensuring secure fastening and vibration resistance
- Optimized torque transmission through external hex drive design for efficient installation and removal
- Enhanced durability with Rockwell C33 hardness maintaining structural integrity under repeated stress
- Versatile partial threading allowing for both clamping and alignment functions in assembly operations
- Regulatory compliance assurance meeting ASME B18.2.1, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural frameworks, and industrial equipment where failure is not an option. The zinc-flake coated steel construction provides superior corrosion protection in demanding environments, while the 1/2"-13 UNC coarse threads with Class 2A fit ensure rapid assembly and reliable performance in vibration-prone applications. The partially threaded design offers dual functionality - the threaded portion secures components while the unthreaded shank maintains alignment integrity. With 150,000 psi tensile strength and Rockwell C33 hardness, this fastener withstands extreme mechanical stresses in construction, automotive, and manufacturing sectors, reducing maintenance frequency and downtime.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1/2"-13 UNC coarse threading and 5" length. Fully compliant with ASME B18.2.1 specifications where identified under SAE J429 Grade 8 requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets. The external hex drive and right-hand thread configuration adhere to industry-standard installation practices.
