S-91268A828 5/8"-11 x 6" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws
High-Strength Grade 8 Steel Hex Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Exceptional load-bearing capacity with 150,000 PSI tensile strength for reliable performance in heavy-duty applications
- Superior wear resistance due to Rockwell C33 hardness, ensuring extended service life under demanding conditions
- Optimized coarse threading (5/8"-11 UNC) provides faster installation and superior resistance to vibration loosening
- Precision Class 2A thread fit guarantees consistent engagement and reliable fastening in industrial assemblies
- Partial threading design allows for controlled clamp force distribution and reduced thread damage risk
- Heavy-duty Grade 8 certification ensures consistent mechanical properties for critical fastening applications
- External hex drive compatibility enables standard tooling and straightforward installation/maintenance procedures
Professional Applications & Engineering Value
These Grade 8 hex head screws deliver exceptional engineering value through their high-strength steel construction and UNC coarse threading, specifically designed to address vibration-induced failures in heavy machinery, structural steel connections, and industrial equipment assemblies. The partial threading configuration prevents stress concentration at the thread run-out, while the external hex drive provides superior torque transmission compared to internal drive systems. With 150,000 PSI tensile strength and Rockwell C33 hardness, these fasteners maintain integrity under extreme static and dynamic loads, making them ideal for construction equipment, automotive frames, and manufacturing machinery where heavy-duty fastening solutions are critical to operational safety and longevity.
Specification Summary & Compliance
Manufactured to ASME B18.2.1 and SAE J429 Grade 8 specifications with Class 2A thread fit tolerance ensuring precise dimensional accuracy. These 5/8"-11 UNC hex head screws feature right-hand coarse threading and comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The 6" length with minimum 1½" thread length provides versatile application coverage while maintaining consistent mechanical properties throughout the fastener.
