S-94361A365 1/2"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional Durability: Made from alloy steel with a Rockwell C32 hardness and 140,000 psi tensile strength, ensuring reliable performance in high-stress applications.
• Superior Corrosion Resistance: Black oxide finish provides enhanced protection against rust and wear, extending the screw's service life in harsh environments.
• Precision Thread Fit: Class 3A thread fit on the 1/2"-20 UNF fine threads guarantees tight, secure fastening with minimal backlash.
• Easy Installation and Removal: Knurled socket head with a 5/16" hex drive offers improved grip and torque application, reducing tool slippage.
• Accurate Alignment and Stability: 5/8" shoulder diameter with standard fit provides precise component positioning and reduces shear stress.
• Compliance with Environmental Standards: Meets RoHS 3 and REACH regulations, ensuring safe use in regulated industrial sectors.
• Right-hand thread direction allows for straightforward assembly and disassembly, compatible with common tools and procedures.

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 black oxide finish not only resists corrosion but also reduces friction during installation. With 1/2"-20 UNF fine threads and a Class 3A fit, it ensures leak-proof and vibration-resistant connections in assemblies requiring exact tolerances. The 5/8" shoulder diameter and standard shoulder fit provide stable pivoting and alignment in rotating parts, such as in conveyor systems or robotic arms, minimizing wear and maintenance downtime. Its high tensile strength and knurled socket head make it ideal for applications where reliability and ease of service are paramount, from aerospace components to industrial manufacturing fixtures.

Specification Summary & Compliance

This shoulder screw adheres to UNF thread standards with a Class 3A thread fit for high precision. The shoulder diameter tolerance is -0.004" to -0.002", and shoulder length tolerance is -0.005" to 0.005", ensuring consistent performance. It is manufactured to meet RoHS 3 (2015/863/EU) with exemption 6(a) for lead in steel and is REACH (EC 1907/2006) compliant, confirming its suitability for global industrial use without hazardous substances.