S-90175A118 3/4"-10 x 3 1/2" ASTM A490, ASTM F3125 High-Strength Steel Heavy Hex Head Screws for Structural Applications

Key Features & Benefits at a Glance

• Exceptional structural reliability with 150,000 PSI tensile strength and Rockwell C38 hardness for demanding applications
• Optimized load distribution through partially threaded design and 2 1/8" grip length to prevent joint failure
• Superior corrosion resistance provided by high-strength steel construction in harsh industrial environments
• Easy installation and removal with external hex drive and 1 1/4" hex head for standard tool compatibility
• Precise thread engagement with UNC coarse threads and Class 2A fit ensuring consistent performance
• Comprehensive regulatory compliance meeting ASTM A490/F3125, RoHS 3, and REACH standards for global acceptance
• Enhanced durability through controlled thread length and right-hand threading for long service life

Professional Applications & Engineering Value

This ASTM A490 Grade hex head screw delivers critical engineering solutions for structural steel connections, heavy machinery assembly, and construction frameworks where failure is not an option. The partially threaded design with precise 2 1/8" grip length concentrates clamping force exactly where needed, preventing stress concentration at thread roots that can lead to catastrophic failure in structural applications. Manufactured from high-grade steel with Rockwell C38 hardness, these heavy-duty fasteners maintain integrity under extreme vibrational loads and dynamic forces common in bridge construction, industrial equipment, and seismic-resistant structures. The 3/4"-10 UNC coarse thread configuration ensures rapid installation while providing sufficient thread engagement for maximum load transfer, making them ideal for time-sensitive projects without compromising safety margins.

Specification Summary & Compliance

This hex head screw features precision Class 2A thread fit with 3/4"-10 UNC coarse threads and complies with ASTM A490/F3125 specifications for structural bolts. The fastener meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) standards for chemical safety. Manufacturing adheres to dimensional requirements including 1 3/8" thread length, 3 1/2" overall length, and 1 1/4" hex head width for consistent performance across applications.