S-91264A645 3/8"-16 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
- Superior tensile and shear resistance with 140,000 psi tensile and 84,000 psi shear strength for reliable performance in demanding applications.
- Vibration-resistant locking thanks to the integrated nylon pellet thread locker that maintains secure fastening from -50° to 250°F.
- Precise thread engagement with Class 3A UNC coarse threads ensuring consistent fit and reduced risk of cross-threading.
- Enhanced durability and corrosion resistance from the black oxide finish on alloy steel, extending service life in harsh environments.
- Easy installation and removal with a knurled socket head and 1/4" hex drive, providing a firm grip and reducing tool slippage.
- Accurate alignment and spacing due to the 2 3/4" shoulder length with tight tolerances, ideal for pivot points and rotating assemblies.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring quality and environmental safety.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address common industrial challenges such as component misalignment, vibration-induced loosening, and high-stress fatigue. The 3/8"-16 UNC thread with Class 3A fit provides reliable fastening in machinery, automotive, and aerospace assemblies where precision is critical. The integrated nylon pellet thread locker secures joints in environments with temperature fluctuations from -50° to 250°F, reducing maintenance needs. Combined with a black oxide finish and Rockwell C32 hardness, it offers excellent wear and corrosion resistance, making it ideal for heavy-duty applications like pivots, linkages, and rotating components that require long-term reliability and minimal downtime.
Specification Summary & Compliance
This shoulder screw features precise dimensions including a 2 3/4" shoulder length with tolerance of -0.005" to 0.005" and Class 3A thread fit for UNC threads. It meets ASME B18.3 specifications and is manufactured from alloy steel under ASTM A574. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), it ensures adherence to environmental and safety standards for industrial use.
