S-91264A723 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 that maintains secure fastening 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 for reliable performance under high stress.
- Precision thread fit with Class 3A UNC coarse threads ensuring accurate alignment and reduced risk of cross-threading during assembly.
- Enhanced durability and corrosion resistance from black oxide finish and Rockwell C32 hardened alloy steel, extending service life in harsh environments.
- Easy installation and removal with standard hex drive (5/16") and knurled socket head for improved grip and torque application.
- Stable shoulder design with controlled diameter and length tolerances for precise component positioning and reduced bearing wear.
- Regulatory compliance assurance meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards for safe, industry-approved use.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address critical challenges in industrial assembly and precision machinery. The Class 3A thread fit and coarse UNC threads provide superior engagement in high-vibration settings, minimizing the risk of thread stripping. The black oxide finish enhances corrosion resistance, while the nylon pellet thread locker secures joints without requiring additional adhesives. With a knurled socket head and hex drive, it allows for efficient torque transmission in confined spaces. Ideal for rotating assemblies, automated equipment, and structural supports, this screw ensures long-term reliability by combining high tensile strength with thermal stability from -50° to 250°F.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit with UNC coarse threads (1/2"-13) and precise shoulder dimensions (diameter tolerance: -0.004" to -0.002"; length tolerance: -0.005" to 0.005"). It complies with ASME B18.3 and ASTM A574 manufacturing standards, and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental and safety adherence.
