S-91283A315 1 1/4"-12 x 5" 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 extended service life under repetitive stress
- Precise thread engagement with Class 2A fit and UNF fine threading for secure, vibration-resistant connections
- Optimized installation efficiency through external hex drive and 1 7/8" head width for high-torque applications
- Enhanced structural stability with partially threaded design concentrating strength where needed most
- Guaranteed material integrity from Grade 5 steel construction meeting rigorous industrial standards
- Full regulatory compliance with ASME B18.2.1, RoHS 3, and REACH for global project acceptance
Professional Applications & Engineering Value
This Grade 5 steel hex head screw delivers critical reliability for heavy machinery, structural steel connections, and industrial equipment assembly. The 1 1/4"-12 UNF fine threading provides superior resistance to vibrational loosening in dynamic load environments, while the partially threaded design maximizes clamp force efficiency. Engineered with external hex drive and substantial head dimensions, it enables high-torque installation without stripping. The combination of 100,000 psi tensile strength and Rockwell C19 hardness ensures consistent performance in high-stress applications, from construction frameworks to manufacturing equipment. These industrial fasteners solve common engineering challenges of joint integrity, material fatigue, and maintenance frequency.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit and UNF thread specifications. The 5" length features 2 3/4" minimum thread length with right-hand threading. Full compliance with ASME B18.2.1 manufacturing specifications, RoHS 3 (2015/863/EU) environmental directives, and REACH (EC 1907/2006) chemical safety regulations ensures international project acceptance and material safety.
