S-91257A689 7/16"-14 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 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 tensile strength of 150,000 psi ensures reliable performance in the most demanding heavy-duty applications.
- Superior corrosion resistance is provided by the zinc yellow-chromate plating, extending the fastener's service life in harsh environments.
- High-strength Grade 8 classification and Rockwell C33 hardness guarantee durability and resistance to shear and vibration.
- Coarse UNC thread and Class 2A fit enable faster installation and provide secure holding power in a wide range of materials.
- Partially threaded design allows for precise clamping force on specific joint sections without unnecessary threading.
- External hex drive and hex head offer a familiar and robust interface for high-torque installation with common tools.
- Full compliance with industry standards including ASME B18.2.1 and SAE J429 ensures consistent quality and interchangeability.
Professional Applications & Engineering Value
This Grade 8 hex head screw is engineered for heavy-duty industrial applications where failure is not an option. The zinc yellow-chromate plated steel construction combats corrosion, a common cause of fastener degradation in manufacturing, construction, and machinery. Its 7/16"-14 UNC coarse thread and Class 2A fit provide excellent grip and rapid assembly in structural steel, heavy equipment, and automotive frames. The partial threading concentrates the clamping force precisely where needed, preventing joint loosening under extreme vibration and load. This combination of high tensile strength and engineered design solves critical challenges in maintaining structural integrity and operational safety.
Specification Summary & Compliance
This fastener features a 7/16"-14 UNC thread with a Class 2A thread fit for consistent dimensional accuracy. It is manufactured to meet the specifications of ASME B18.2.1 and SAE J429 for Grade 8 fasteners. The product is also verified to be RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant.
