S-91259A716 3/8"-16 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Durability - Alloy steel construction with Rockwell C32 hardness and 140,000 psi tensile strength ensures long-lasting performance in demanding applications.
• Precise Alignment - Class 3A thread fit and standard shoulder fit provide accurate positioning and reduced assembly vibration.
• Superior Corrosion Resistance - Black oxide finish protects against rust and wear, extending service life in harsh industrial environments.
• High Shear Strength - 84,000 psi minimum shear strength delivers reliable fastening under heavy loads and dynamic conditions.
• Easy Installation & Removal - Hex socket drive with 1/4" size and knurled head allows for secure tool grip and efficient maintenance.
• Industry Compliance - Meets ASME B18.3 specifications and is RoHS 3 & REACH compliant for safe, regulated use.
• Optimized Shoulder Design - 1-1/2" shoulder length with tight tolerances ensures stable bearing surfaces for rotating components.

Professional Applications & Engineering Value

This 3/8"-16 UNC shoulder screw is engineered to address critical alignment and load-bearing challenges in industrial machinery. The alloy steel material, combined with black oxide finish, provides excellent resistance to corrosion and abrasion, making it ideal for automotive assemblies, precision tooling, and conveyor systems. The Class 3A thread fit and precisely machined shoulder minimize play, ensuring accurate component positioning in rotating mechanisms like bearings and pulleys. With 140,000 psi tensile strength and 84,000 psi shear strength, it handles high-stress applications without failure, reducing downtime and maintenance costs. The hex socket drive and knurled head facilitate quick installation in confined spaces, enhancing productivity in manufacturing and repair operations.

Specification Summary & Compliance

This shoulder screw features a 3/8"-16 UNC coarse thread with Class 3A fit for precise engagement, and a shoulder diameter of 1/2" with tolerances from -0.004" to -0.002". The shoulder length is 1-1/2" with a tolerance of -0.005" to 0.005", ensuring consistent performance. Manufactured to ASME B18.3 standards using ASTM A574 alloy steel, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and material integrity.