S-94361A373 1/2"-20 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in dynamic environments.
• Black oxide finish on alloy steel offers enhanced corrosion resistance and a durable, low-glare surface for extended service life.
• Knurled socket head with 5/16" hex drive allows for secure tool grip and easy installation, even in tight spaces.
• Fine UNF thread (1/2"-20) delivers improved clamping force and finer adjustment capabilities compared to coarse threads.
• Consistent shoulder diameter and length tolerances ensure precise alignment and smooth rotation in mating components.
• Compliance with RoHS 3 and REACH regulations guarantees environmental safety and suitability for global industrial markets.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical alignment and load-bearing challenges in machinery, automation, and precision equipment. The 1/2"-20 UNF fine thread and Class 3A fit provide exceptional accuracy, reducing play and wear in assemblies subject to vibration. The black oxide finish not only resists corrosion but also reduces friction, making it ideal for rotating parts like bearings, pulleys, and linkages. With a Rockwell C32 hardness and robust shoulder design, it maintains dimensional stability under heavy loads, ensuring long-term reliability in demanding industrial applications such as automotive jigs, conveyor systems, and robotic arms.

Specification Summary & Compliance

This shoulder screw features a Class 3A thread fit with precise UNF standards, ensuring tight tolerances for reliable performance. Key dimensions include a shoulder diameter of 5/8" (tolerance: -0.004" to -0.002") and shoulder length of 1 1/8" (tolerance: -0.005" to 0.005"), supporting accurate assembly. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and REACH (EC 1907/2006), meeting stringent environmental and safety regulations for industrial use.