S-91283A260 1 1/4"-7 x 6" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 100,000 psi tensile strength for reliable performance in demanding applications
• Superior durability and wear resistance thanks to Grade 5 steel construction and Rockwell C19 hardness rating
• Secure and stable fastening achieved through Class 2A thread fit and UNC coarse threading for vibration resistance
• Easy installation and removal with external hex drive design and 1 7/8" head width for standard wrench compatibility
• Optimized thread engagement with partially threaded design preventing unnecessary thread wear in non-critical sections
• Industry-standard compliance meeting ASME B18.2.1 specifications for consistent quality and interchangeability
• Environmental responsibility with RoHS 3 and REACH compliance for safe use in regulated industries

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these Grade 5 hex head screws provide critical solutions for structural assemblies requiring high tensile strength and reliable performance. The 1 1/4"-7 UNC coarse thread configuration ensures rapid installation and superior resistance to vibration loosening in machinery, construction, and manufacturing equipment. The partially threaded design concentrates thread engagement where needed most, reducing stress concentration and preventing thread damage in non-critical sections. With external hex drive compatibility and substantial 1 7/8" head width, these screws accommodate standard industrial tools for efficient maintenance and assembly operations. The 6" length and 2 3/4" minimum thread length provide versatile fastening capabilities for thick materials and structural components across various industrial sectors.

Specification Summary & Compliance

This hex head screw features precise Class 2A thread fit with 1 1/4"-7 UNC coarse threading and right-hand thread direction. Manufacturing complies with ASME B18.2.1 specifications and SAE J429 Grade 5 standards, ensuring dimensional accuracy and mechanical properties. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, making these screws suitable for use in environmentally conscious industrial applications worldwide.