S-91268A878 3/4"-10 x 6 1/2" 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 load-bearing capacity with 150,000 psi tensile strength, ideal for high-stress industrial assemblies
- Superior corrosion and wear resistance from Grade 8 steel construction and Rockwell C33 hardness
- Reliable coarse UNC threading ensures quick assembly and vibration resistance in demanding environments
- Precise Class 2A thread fit guarantees consistent engagement and reduced risk of cross-threading
- Optimized partial threading provides focused clamping force where needed along the 6½" length
- External hex drive compatibility allows for high-torque installation with standard tools
- Full regulatory compliance with ASME B18.2.1, RoHS 3, and REACH standards for global project suitability
Professional Applications & Engineering Value
This Grade 8 steel hex head screw delivers critical performance in heavy machinery, structural steel connections, and industrial equipment where high tensile strength and durability are non-negotiable. The 3/4"-10 UNC coarse thread design resists loosening under dynamic loads and enables faster installation in thick materials. With partial threading concentrating strength in the engaged section and Rockwell C33 hardness preventing deformation under torque, it solves common failure points in construction, manufacturing, and transportation equipment applications. The external hex drive accommodates high installation torque, making it suitable for both maintenance and original equipment assembly.
Specification Summary & Compliance
This fastener maintains Class 2A thread fit per ASME/ANSI standards, ensuring precise dimensional accuracy and interchangeability. Manufacturing adheres to ASME B18.2.1 and SAE J429 Grade 8 specifications, guaranteeing consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making it suitable for use in regulated industries and international markets.
