S-90969A320 5/16"-18 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
- Exceptional load-bearing capacity with 140,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance provided by black oxide finish, extending service life in demanding industrial environments
- Precision thread engagement with Class 3A fit ensuring consistent, vibration-resistant fastening in critical assemblies
- Enhanced installation control through knurled head and hex drive design for secure tool grip and torque application
- Space-saving ultra-low profile socket head design ideal for applications with limited clearance requirements
- Optimized shoulder functionality with precisely controlled diameter and length tolerances for accurate component positioning
- Regulatory compliance assurance meeting RoHS 3 and REACH standards for global industrial applications
Professional Applications & Engineering Value
This alloy steel shoulder screw with black oxide finish delivers critical engineering solutions for precision machinery and industrial equipment. The 5/16"-18 UNC coarse thread with Class 3A fit provides superior vibration resistance in dynamic applications, while the precisely machined shoulder ensures accurate alignment of rotating components in assemblies, pivots, and linkages. The ultra-low profile socket head with knurled texture enables reliable torque transmission in confined spaces, making it ideal for automation systems, precision instruments, and mechanical assemblies where space optimization and reliable fastening are paramount. The combination of Rockwell C30 hardness and controlled shoulder tolerances ensures consistent performance in high-cycle applications.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit and controlled shoulder diameter tolerance (-0.004" to -0.002") and shoulder length tolerance (-0.005" to 0.005"). The screw conforms to UNC thread standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance requirements for industrial use. The alloy steel construction with black oxide finish ensures consistent performance across demanding applications.
