S-91247A485 3/4"-16 x 5" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 120,000 psi tensile strength for reliable performance in demanding applications
• Superior corrosion resistance through zinc plating that protects against rust in harsh industrial environments
• Precise thread engagement with Class 2A UNF fine threading ensuring secure fastening and vibration resistance
• Optimized strength-to-weight ratio from Grade 5 steel construction with Rockwell C25 hardness for durable, long-lasting performance
• Easy installation and removal with standard external hex drive and 1 1/8" head width for straightforward tool access
• Reduced material stress through partial threading design that concentrates strength where needed most
• Regulatory compliance assurance meeting ASME, SAE, RoHS 3, and REACH standards for quality and environmental safety

Professional Applications & Engineering Value

This Grade 5 hex head screw delivers critical engineering solutions for heavy-duty industrial applications where failure is not an option. The 3/4"-16 UNF fine threading provides superior resistance to vibration loosening in machinery, construction equipment, and structural assemblies. The zinc plated finish creates a protective barrier against corrosion in environments exposed to moisture, chemicals, or outdoor conditions. With partial threading and external hex drive, this fastener offers optimal clamping force distribution while enabling quick installation in confined spaces. The combination of 120,000 psi tensile strength and Rockwell C25 hardness ensures reliable performance under extreme mechanical stress, making it ideal for critical joints in manufacturing equipment, transportation systems, and infrastructure projects requiring durable fastening solutions.

Specification Summary & Compliance

This 5" hex head screw features precision Class 2A thread fit with 3/4"-16 UNF fine threading and 1 3/4" minimum thread length. Manufactured to exacting standards including ASME B18.2.1 and SAE J429 Grade 5 specifications. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global markets. The right-hand thread direction and external hex drive provide industry-standard compatibility with common installation tools and procedures.