S-91268A207 5/16"-18 x 4" 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 high-stress applications
- Superior corrosion resistance and durability through Grade 8 steel construction with Rockwell C33 hardness
- Optimized installation efficiency with UNC coarse threading and Class 2A thread fit for quick assembly
- Secure fastening in demanding environments thanks to partial threading design that maximizes grip strength
- Industry-standard compatibility with 1/2" external hex drive conforming to ASME B18.2.1 and SAE J429 specifications
- Environmental compliance assurance meeting RoHS 3 and REACH regulations for global industrial use
- Reduced vibration loosening risk through coarse thread configuration maintaining connection integrity
Professional Applications & Engineering Value
This Grade 8 hex head screw delivers critical engineering solutions for heavy machinery, structural assemblies, and industrial equipment where high tensile strength and vibration resistance are paramount. The 5/16"-18 UNC coarse threading combined with Class 2A thread fit ensures rapid installation while maintaining precise tolerances in demanding applications. Manufactured from hardened steel with Rockwell C33 hardness, this partially threaded fastener provides superior clamping force distribution, preventing joint failure in construction, automotive, and manufacturing sectors. The 4" length and external hex drive design offer optimal accessibility in confined spaces, making it ideal for structural connections, equipment mounting, and heavy-duty assemblies requiring 150,000 PSI tensile strength performance.
Specification Summary & Compliance
This hex head screw maintains precision Class 2A thread fit with UNC coarse threading (5/16"-18) and complies with ASME B18.2.1 and SAE J429 manufacturing specifications. The fastener demonstrates full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial applications. Dimensional accuracy includes 4" length with minimum 7/8" thread length and 1/2" head width for consistent performance across standardized installations.
