S-91571A448 1"-8 x 4 1/4" ASME B18.2.6, ASTM A325, ASTM F3125 Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
Medium-Strength Steel Heavy Hex Head Screws for Structural Applications
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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 120,000 PSI tensile strength for reliable performance in demanding structural applications
- Superior corrosion resistance and durability through high-grade steel construction with Rockwell C19 hardness
- Quick installation and removal with external hex drive and 1 5/8" head width for optimal tool engagement
- Secure fastening in various materials using coarse UNC threads with Class 2A fit for consistent engagement
- Versatile partial threading design providing 1 3/4" threaded length and 2 1/2" grip length for flexible application use
- Industry compliance assurance meeting ASME B18.2.6, ASTM A325, and ASTM F3125 specifications for quality reliability
- Environmental regulation compliance with RoHS 3 and REACH requirements for safe industrial use
Professional Applications & Engineering Value
This Grade A325 heavy-duty hex head screw delivers critical engineering solutions for structural steel connections, construction frameworks, and industrial machinery assembly. The 1"-8 UNC coarse thread configuration ensures rapid installation while maintaining vibration resistance in dynamic load environments. Manufactured from high-strength steel with Rockwell C19 hardness, this fastener withstands extreme tension and shear forces where ordinary fasteners would fail. The partially threaded design allows for precise clamp load distribution, making it ideal for connection points requiring both structural integrity and adjustability. With external hex drive compatibility and right-hand threading, installation efficiency is maximized while maintaining the rigorous demands of structural steel applications and heavy equipment manufacturing.
Specification Summary & Compliance
This hex head screw features precise Class 2A thread fit tolerances and 1"-8 UNC coarse threading manufactured to exacting standards. Compliance includes ASME B18.2.6 dimensional specifications, ASTM A325 and ASTM F3125 material and mechanical property requirements, along with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial safety and sustainability.
