S-91283A668 2"-4 1/2 x 7" ASME B18.2.1, ASTM A449 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 capability with 90,000 PSI tensile strength, ideal for heavy-duty structural connections
- Superior durability and wear resistance due to Grade 5 steel construction and Rockwell B90 hardness
- Reliable coarse UNC threading ensures quick assembly and reduced cross-threading risks in industrial environments
- Optimized thread engagement with 4 1/2" minimum thread length for secure fastening in thick materials
- Precise Class 2A thread fit guarantees consistent performance and interchangeability in inch-system applications
- Robust external hex drive design provides high torque transmission and easy installation with standard tools
- Comprehensive regulatory compliance meets ASME, ASTM, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
This heavy-duty hex head screw addresses critical engineering challenges in construction, machinery assembly, and structural steel frameworks where vibration resistance and long-term reliability are paramount. The Grade 5 steel composition combined with UNC coarse threading delivers superior fatigue resistance under dynamic loads, while the partially threaded design concentrates strength where needed most. The external hex drive and substantial 3" head width enable secure tightening in high-torque applications, preventing slippage during installation. These industrial fasteners maintain integrity in demanding environments thanks to their controlled Rockwell B90 hardness and compliance with ASME B18.2.1 specifications, making them ideal for OEM equipment, structural bracing, and heavy machinery maintenance where failure is not an option.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and ASTM A449 standards with Class 2A thread fit tolerance for precise inch-system applications. Features 2" thread diameter with UNC coarse spacing and 4 1/2" minimum thread length on a 7" overall fastener. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations for environmental safety.
