S-91571A330 7/8"-9 x 6" 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 hardness and durability with Rockwell C19 rating to resist wear and deformation under high stress conditions
- Optimized thread design featuring UNC coarse threads for faster installation and reduced cross-threading risks
- Precise Class 2A thread fit ensuring consistent engagement and vibration resistance in assembled connections
- Robust material construction using high-grade steel for long-term corrosion resistance and structural integrity
- Versatile partial threading with 1½" thread length and 4½" grip length for flexible application across various material thicknesses
- Comprehensive compliance assurance meeting ASME, ASTM, RoHS 3 and REACH standards for quality and environmental safety
Professional Applications & Engineering Value
These Grade A325 hex head screws deliver critical engineering solutions for structural steel connections, heavy machinery assembly, and construction applications where high tensile strength and reliability are paramount. The 7/8"-9 UNC coarse thread configuration provides superior resistance to vibration loosening while enabling rapid installation in structural steel members. Manufactured from high-strength steel with Rockwell C19 hardness, these partially threaded fasteners maintain clamping force integrity under dynamic loads and extreme conditions. The external hex drive design allows for high-torque installation with standard tools, making them ideal for industrial applications requiring both exceptional durability and straightforward assembly processes.
Specification Summary & Compliance
This Grade A325 hex head screw features precise Class 2A thread fit with UNC coarse threading (7/8"-9) and complies with ASME B18.2.6, ASTM A325, and ASTM F3125 manufacturing specifications. The fastener maintains dimensional accuracy with 6" overall length, 1½" thread length, and 4½" grip length. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring suitability for regulated industrial applications requiring verified material safety and performance reliability.
