S-91259A848 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, this shoulder screw reliably handles high-stress applications without failure.
• Precision Shoulder for Accurate Alignment: The 3 1/4" shoulder length with tight diameter and length tolerances ensures perfect component positioning and reduces assembly errors.
• Superior Corrosion Resistance: Black oxide finish provides durable protection against rust and wear, extending service life in harsh industrial environments.
• High-Strength Alloy Steel Construction: Rockwell C32 hardness offers excellent durability and resistance to deformation under heavy loads.
• Secure Fastening with Precision Threads: Class 3A thread fit and 5/8"-11 UNC coarse threads deliver reliable, vibration-resistant connections in demanding applications.
• Easy Installation and Removal: Knurled socket head with 3/8" hex drive allows for quick, secure tool engagement and reduces slippage during torque application.
• Compliance with Industry Standards: Meets ASME B18.3 specifications and global regulatory requirements including RoHS 3 and REACH for safe, reliable use.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to solve critical alignment and load-bearing challenges in industrial machinery, automation systems, and precision equipment. The 3 1/4" shoulder length with controlled tolerances ensures accurate component positioning, eliminating misalignment issues that cause premature wear. The black oxide finish provides essential corrosion resistance in environments exposed to moisture, chemicals, or temperature variations. With 140,000 psi tensile strength and Class 3A thread fit, it maintains secure fastening under dynamic loads and vibration, making it ideal for pivots, shafts, and rotating assemblies. The knurled socket head with 3/8" hex drive facilitates easy installation in confined spaces, reducing assembly time while preventing tool slippage. These features make it a reliable choice for applications requiring high-strength precision shoulder bolts that meet rigorous industry standards.

Specification Summary & Compliance

This shoulder screw features 5/8"-11 UNC coarse threads with Class 3A thread fit for precise engagement, and a shoulder diameter of 3/4" with tolerances from -0.004" to -0.002". The shoulder length is 3 1/4" with length tolerance of -0.005" to 0.005". Manufactured to ASME B18.3 specifications using ASTM A574 alloy steel, it is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to international safety and environmental regulations.