S-91259A847 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

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 provided by the black oxide finish, extending service life in harsh industrial environments
• Precision shoulder dimensions with 3/4" diameter and 3" length ensure accurate alignment and smooth rotation in assemblies
• Class 3A thread fit delivers tighter tolerances for secure fastening and vibration resistance in critical applications
• Enhanced grip and torque application through the knurled socket head with 3/8" hex drive for easier installation and removal
• High durability from Rockwell C32 hardness alloy steel, maintaining structural integrity under repeated stress
• Regulatory compliance with ASME B18.3, RoHS 3, and REACH standards ensures quality and environmental safety

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to address critical alignment and durability challenges in heavy-duty industrial applications. The alloy steel construction with black oxide finish provides exceptional resistance to corrosion and wear, making it ideal for machinery, automotive, and manufacturing equipment where exposure to moisture and chemicals is common. The precise 3" shoulder length and 3/4" shoulder diameter ensure accurate positioning of moving components, reducing wear and maintaining operational efficiency. The coarse UNC thread with Class 3A fit offers superior vibration resistance, preventing loosening in high-stress environments. These features make it particularly valuable in applications requiring exact dimensional control and long-term reliability, such as pivot points, rotating shafts, and precision assemblies.

Specification Summary & Compliance

This shoulder screw maintains precise dimensional tolerances with shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". The thread fit Class 3A ensures high precision for secure fastening. Manufacturing and quality adhere to ASME B18.3 specifications where applicable under ASTM A574. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, confirming its suitability for global industrial use without hazardous substance restrictions.