S-91264A592 5/16"-18 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
- Exceptional load-bearing capacity with 140,000 psi tensile and 84,000 psi shear strength for reliable performance in demanding applications.
- Secure vibration-resistant locking thanks to the integrated nylon pellet thread locker, maintaining integrity from -50° to 250°F.
- Enhanced durability and corrosion resistance provided by the black oxide finish, extending service life in harsh environments.
- Precise alignment and reduced wear with Class 3A thread fit and standard shoulder fit for accurate component positioning.
- Easy installation and removal using a hex drive and knurled socket head, improving assembly efficiency.
- High material strength and hardness from alloy steel with Rockwell C32, ensuring long-term reliability under stress.
- Broad industrial compliance meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards for safe, quality-assured use.
Professional Applications & Engineering Value
This 5/16"-18 UNC shoulder screw is engineered to address critical challenges in industrial machinery, automation systems, and precision equipment. Made from alloy steel with a black oxide finish, it combats corrosion and wear, while the Class 3A thread fit and standard shoulder ensure exact alignment to minimize part movement and fatigue. The integrated nylon pellet thread locker provides reliable vibration resistance across a wide temperature range (-50° to 250°F), preventing loosening in dynamic applications. Ideal for high-stress assemblies, this screw enhances operational safety and reduces maintenance needs, delivering consistent performance in heavy-duty and precision engineering environments.
Specification Summary & Compliance
This shoulder screw features precise dimensions, including a 3/8" shoulder diameter with tolerance of -0.004" to -0.002" and 2 1/4" shoulder length with tolerance of -0.005" to 0.005", ensuring accurate fits. The UNC coarse threads with Class 3A fit provide tight tolerances for secure fastening. It complies with ASME B18.3 and ASTM A574 specifications, and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, affirming adherence to environmental and safety standards.
