S-94361A388 5/8"-18 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability & Corrosion Resistance: Black oxide finish provides superior protection against rust and wear in demanding industrial environments.
• Exceptional Tensile Strength: 140,000 psi tensile strength ensures reliable performance under high-stress applications and reduces the risk of fastener failure.
• Precision Thread Fit: Class 3A thread fit offers tighter tolerances for secure, vibration-resistant assemblies and improved load distribution.
• High Hardness for Longevity: Rockwell C32 hardness increases resistance to deformation and extends service life in repetitive or high-torque scenarios.
• Secure & Easy Installation: Knurled socket head with 3/8" hex drive prevents tool slippage and allows for efficient tightening in confined spaces.
• Accurate Shoulder Alignment: Standard shoulder fit with precise diameter and length tolerances ensures proper component positioning and reduces assembly errors.
• Compliance with Environmental Standards: RoHS 3 and REACH compliance guarantees adherence to international regulations, making it suitable for global supply chains.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The UNF fine thread and Class 3A thread fit provide exceptional resistance to loosening under vibration, which is vital for maintaining alignment in rotating assemblies or linear motion guides. The black oxide finish not only enhances corrosion resistance but also reduces galling during installation, prolonging tool life. With a knurled socket head and robust shoulder diameter, it ensures secure fastening in applications like bearing retention, linkages, and pivoting mechanisms, where exact positioning and high tensile strength are non-negotiable for operational safety and efficiency.

Specification Summary & Compliance

This shoulder screw adheres to UNF thread standards with a Class 3A thread fit for high precision. Key dimensional tolerances include a shoulder diameter of 3/4" (tolerance: -0.004" to -0.002") and shoulder length of 1" (tolerance: -0.005" to 0.005"). It is manufactured from alloy steel and meets RoHS 3 (2015/863/EU) compliance with exemption 6(a) for lead as an alloying element in steel, as well as REACH (EC 1907/2006) compliance, ensuring suitability for regulated industrial markets.