S-91259A850 5/8"-11 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 strength and 84,000 psi shear strength for reliable performance in demanding applications.
- Superior corrosion resistance from the black oxide finish, extending service life in harsh industrial environments.
- Precision thread engagement with Class 3A fit and UNC coarse threads ensuring secure, vibration-resistant fastening.
- Enhanced grip and torque application via the knurled socket head and 3/8" hex drive, preventing tool slippage during installation.
- Accurate component alignment with a precisely machined shoulder featuring tight diameter and length tolerances.
- High durability and wear resistance from alloy steel construction and Rockwell C32 hardness.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use.
Professional Applications & Engineering Value
This heavy-duty shoulder screw is engineered to solve critical alignment and load distribution challenges in precision machinery. The alloy steel construction and Class 3A thread fit ensure minimal deflection under high stress, making it ideal for pivots, axles, and mounting points in automotive assemblies, industrial robots, and conveyor systems. The black oxide finish provides an added layer of corrosion protection, reducing maintenance in humid or abrasive settings. With its knurled socket head and UNC coarse threads, it offers quick installation and reliable retention, preventing operational downtime in high-cycle applications.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications with a Class 3A thread fit for precise engagement. Critical dimensions include a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005" to ensure consistent performance. It is manufactured in compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, guaranteeing safety and sustainability for industrial use.
