S-94361A385 5/8"-18 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.
• Superior corrosion resistance from the black oxide finish prolongs service life in harsh industrial environments, minimizing maintenance needs.
• Precision Class 3A thread fit guarantees tight tolerances and secure fastening, enhancing assembly accuracy and vibration resistance.
• Knurled socket head with 3/8" hex drive provides improved grip and torque application, facilitating easier installation and removal.
• Durable alloy steel construction with Rockwell C32 hardness offers excellent wear resistance and longevity under repetitive loads.
• Compliance with RoHS 3 and REACH regulations ensures environmental safety and meets global industry standards for hazardous substances.
• Standard shoulder fit with fine UNF threads allows for precise alignment and secure positioning in machinery and equipment.

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 provides a protective layer against rust and corrosion, making it ideal for environments exposed to moisture or chemicals. With a Class 3A thread fit and UNF fine thread design, it ensures minimal backlash and superior clamping force in applications requiring exact alignment, such as rotating shafts, bearings, and linkages. The knurled socket head enhances tool engagement, reducing slippage during high-torque assembly. By combining high tensile strength and consistent dimensional accuracy, this shoulder screw minimizes downtime and maintenance costs in demanding industrial settings.

Specification Summary & Compliance

The screw adheres to inch system measurements with precise tolerances: shoulder diameter of 3/4" (tolerance: -0.004" to -0.002") and shoulder length of 5/8" (tolerance: -0.005" to 0.005"). Thread specifications include 5/8"-18 UNF fine thread with a Class 3A fit for high accuracy. It complies with RoHS 3 (2015/863/EU) under exemption 6(a) for lead in steel and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met.