S-91283A576 1 3/4"-5 x 8" 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 capacity with 90,000 psi tensile strength for reliable performance in demanding applications.
- Superior durability from ASTM A449 steel construction and Rockwell B90 hardness, resisting wear and deformation.
- Easy installation and removal with a 2 5/8" external hex head and coarse UNC threading, reducing assembly time.
- Secure fastening with precise fit due to Class 2A thread tolerance, minimizing loosening under vibration.
- Versatile partial threading on an 8" length allows for both clamping and alignment in structural joints.
- Compliance with industry standards including ASME B18.2.1, ensuring consistent quality and interchangeability.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for safe use in regulated industries.
Professional Applications & Engineering Value
This Grade 5 hex head screw is engineered to address critical challenges in heavy machinery, construction, and industrial equipment assembly. The ASTM A449 steel composition and coarse UNC threads provide high resistance to shear and tensile stresses, preventing joint failure in dynamic environments. Its partially threaded design offers optimal grip length for bolted connections where vibration resistance is essential, while the external hex drive ensures straightforward torque application with standard tools. Ideal for structural steel frameworks, conveyor systems, and manufacturing fixtures, this fastener delivers reliable tensile strength and longevity, reducing maintenance downtime and enhancing operational safety.
Specification Summary & Compliance
This screw adheres to Class 2A thread fit per UNC standards, ensuring dimensional accuracy and compatibility. It meets ASME B18.2.1 specifications and is manufactured from ASTM A449 steel. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted hazardous substances for industrial use.
