S-8077A266 1 1/8"-7 ASME B18.3 Shoulder Screws
Shoulder 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
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh industrial environments and chemical exposure
- Precise component alignment thanks to the 1 1/2" shoulder diameter with tight tolerance control for reduced vibration and wear
- High-strength performance delivering 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications
- Enhanced grip and torque application with knurled head and 7/8" hex drive, preventing slippage during installation
- Durable black oxide finish providing additional corrosion protection and reduced light reflection in operational settings
- Reliable thread engagement with Class 3A UNC coarse threads ensuring secure fastening in high-vibration conditions
- Regulatory compliance assurance meeting ASME B18.3 standards and environmental regulations (RoHS 3, REACH) for global supply chain integration
Professional Applications & Engineering Value
This 1 1/8"-7 UNC shoulder screw delivers critical engineering value in precision assembly systems where alignment and rotational accuracy are paramount. The 316 stainless steel material provides exceptional resistance to corrosive elements, making it suitable for marine, chemical processing, and food manufacturing equipment. The black oxide finish enhances surface durability while minimizing galling in high-friction applications. With its Class 3A thread fit and coarse UNC threading, it maintains secure fastening under dynamic loads and vibration, preventing loosening in machinery, robotic arms, and conveyor systems. The precisely machined shoulder acts as a bearing surface or pivot point, eliminating the need for additional spacers and reducing assembly complexity in automated equipment and precision tooling.
Specification Summary & Compliance
Manufactured to exacting dimensional standards with Class 3A thread fit and shoulder diameter tolerance of -0.004" to -0.002". Thread specification follows 1 1/8"-7 UNC coarse thread profile with right-hand direction. Complies with ASME B18.3 manufacturing specifications and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for hazardous substance restrictions.
