S-91286A216 3/8"-16 x 3" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 150,000 psi provides superior load-bearing capacity for critical structural applications.
• High hardness rating (Rockwell C33) ensures excellent wear resistance and reduced fastener deformation under stress.
• Zinc-flake coating offers outstanding corrosion protection, significantly extending service life in harsh environments.
• Grade 8 classification guarantees consistent mechanical properties for reliable performance in heavy-duty assemblies.
• Coarse UNC threads with Class 2A fit enable faster installation and better vibration resistance in industrial equipment.
• Partially threaded design provides optimal clamping force distribution while reducing weight and material usage.
• External hex drive allows for high-torque installation using standard tools, improving assembly efficiency.

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 addresses common industrial challenges including environmental exposure and chemical degradation, while the 3/8"-16 UNC coarse thread configuration ensures secure fastening in vibrating machinery and structural frameworks. With partial threading concentrating clamping force where needed most, these fasteners prevent joint loosening in heavy equipment, construction machinery, and transportation applications. The combination of 150,000 psi tensile strength and Rockwell C33 hardness provides exceptional resistance to shear forces and fatigue, making them ideal for critical connections in manufacturing, infrastructure, and automotive assemblies where failure is not an option.

Specification Summary & Compliance

Manufactured to precise dimensional standards with Class 2A thread fit tolerance for consistent engagement. Complies with ASME B18.2.1 and SAE J429 specifications for mechanical properties and dimensional requirements. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance standards. Features 3/8"-16 UNC coarse threads with 1" minimum thread length on a 3" overall length configuration.