S-94361A364 1/2"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Load-Bearing Capacity: With a tensile strength of 140,000 PSI and Rockwell C32 hardness, this shoulder screw reliably handles high-stress applications without deformation or failure.
• Superior Corrosion Resistance: The black oxide finish provides a durable protective layer, extending service life in humid or mildly corrosive industrial environments.
• Precision Thread Fit for Secure Fastening: Class 3A UNF fine threads ensure tight, vibration-resistant connections, minimizing the risk of loosening in dynamic machinery.
• Accurate Shoulder Alignment: The 5/8" shoulder diameter with tight tolerances guarantees precise component positioning and smooth rotational movement in assemblies.
• Easy Installation and Removal: The knurled socket head with 5/16" hex drive allows for secure tool grip and efficient torque application, reducing assembly time.
• Compliance with Environmental Standards: Meets RoHS 3 and REACH regulations, ensuring safe use in regulated industries and global market acceptance.
• Optimized for Fine Thread Applications: The 1/2"-20 UNF thread design offers improved adjustment precision and higher fatigue strength compared to coarse threads.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision machinery and industrial equipment. The Class 3A UNF fine threads provide superior resistance to vibrational loosening, making it ideal for high-speed rotating assemblies and precision alignment systems. The black oxide finish not only enhances corrosion resistance but also reduces galling during installation. The precisely machined 5/8" shoulder diameter serves as a reliable bearing surface for gears, pulleys, and linkages, maintaining exact positioning under load. With its 140,000 PSI tensile strength, it reliably supports heavy dynamic loads in automation equipment, automotive jigs, and packaging machinery, reducing maintenance downtime and replacement costs.

Specification Summary & Compliance

This shoulder screw features 1/2"-20 UNF fine threads with Class 3A fit for precise engagement, manufactured to UNF standards. The shoulder diameter maintains a tolerance of -0.004" to -0.002" with shoulder length tolerance of -0.005" to 0.005" for consistent performance. It is RoHS 3 (2015/863/EU) compliant with exemption 6(a) for lead as an alloying element in steel and REACH (EC 1907/2006) compliant per the latest substance list, ensuring regulatory adherence for industrial use.