S-91283A320 1 1/4"-12 x 6" ASME B18.2.1, SAE J429 Medium-Strength Grade 5 Steel Hex Head Screws
Medium-Strength Grade 5 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 100,000 psi tensile strength for reliable performance in demanding applications
- Superior wear resistance due to Rockwell C19 hardness, ensuring long service life under repeated stress
- Precise thread engagement with Class 2A fit and UNF fine threading for secure, vibration-resistant connections
- Easy installation and removal with standard external hex drive and 1 7/8" head width for common tool compatibility
- Optimized thread distribution through partial threading design that concentrates strength where needed most
- Regulatory compliance assurance meeting ASME B18.2.1 standards plus RoHS 3 and REACH environmental directives
- Corrosion-resistant steel construction providing durable performance in various industrial environments
Professional Applications & Engineering Value
This Grade 5 hex head screw delivers critical engineering value through its high-strength steel construction and UNF fine threading, specifically designed to address industrial fastening challenges. The 1 1/4"-12 thread size with Class 2A fit ensures precise alignment and superior resistance to vibration loosening in heavy machinery, structural assemblies, and equipment manufacturing. The 6" length with partial threading provides optimal clamp force distribution while the external hex drive accommodates standard tools for efficient installation in confined spaces. These industrial hex bolts solve critical connection reliability issues in applications where 100,000 psi tensile strength and consistent performance under dynamic loads are essential requirements.
Specification Summary & Compliance
Manufactured to precise inch system dimensions with Class 2A thread fit tolerance per UNF standards. Complies with ASME B18.2.1 manufacturing specifications and SAE J429 Grade 5 strength requirements. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards. Thread specifications include 1 1/4"-12 UNF fine thread with right-hand direction and 2 3/4" minimum thread length on a 6" partially threaded shank configuration.
