S-91264A180 1/2"-13 ASME B18.3, ASTM A574 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
- Vibration-resistant locking with integrated nylon pellet thread locker maintains secure fastening in temperatures from -50° to 250°F, preventing loosening in dynamic applications.
- Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength ensures reliable performance under heavy mechanical stress.
- Precision alignment and reduced wear thanks to the 5/8" shoulder diameter with tight tolerance, providing accurate component positioning and bearing surfaces.
- Superior corrosion resistance from the black oxide finish protects against rust and extends service life in harsh industrial environments.
- High-strength alloy steel construction with Rockwell C32 hardness offers durability and fatigue resistance for long-term use.
- Easy installation and removal with 5/16" hex drive and knurled head for improved grip, facilitating maintenance and assembly.
- Reliable thread engagement with Class 3A thread fit and 1/2"-13 UNC coarse threads ensures consistent, secure connections in high-vibration settings.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in precision machinery, automotive assemblies, and heavy-duty industrial equipment. The 5/8" shoulder diameter with controlled tolerances acts as a precise pivot or bearing surface, minimizing misalignment and reducing wear on connected components. The black oxide finish provides essential corrosion protection, while the nylon pellet thread locker secures fastenings against vibrations from -50° to 250°F—ideal for engines, conveyors, and robotic arms. With 1/2"-13 UNC coarse threads and Class 3A fit, it ensures quick assembly and reliable performance in high-stress applications, supporting efficient production and reduced downtime.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit for precise engagement, conforming to UNC thread standards. Shoulder dimensions include a diameter of 5/8" (tolerance: -0.004" to -0.002") and length of 5/8" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 and ASTM A574 specifications, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
