S-97832A272 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 Stainless Steel construction, ideal for harsh environments and extended service life.
• Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable performance in high-stress applications.
• Precise alignment and pivot function enabled by the 3/8" diameter shoulder with controlled tolerances, reducing wear on mating parts.
• Secure and easy installation with a knurled socket head and hex drive, providing excellent grip and torque transmission.
• Dependable thread engagement with a Class 3A fit and coarse 1/4"-20 UNC thread, ensuring consistent fastening and vibration resistance.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality and environmental safety.
• Versatile mounting and pivoting solution suitable for a wide range of industrial machinery and equipment assemblies.

Professional Applications & Engineering Value

This 18-8 Stainless Steel shoulder screw is engineered to address critical challenges in mechanical design, such as component misalignment and pivot point wear. The precision shoulder with a diameter of 3/8" and tight tolerance control ensures accurate positioning, which is vital in assemblies requiring rotational movement or precise spacing. The coarse UNC thread and Class 3A thread fit provide robust fastening that resists loosening under dynamic loads, making it ideal for use as a mounting screw or pivot screw in heavy-duty machinery, automation systems, and conveyor equipment. The knurled socket head enhances grip during installation, even in oily conditions, while the material's inherent corrosion resistance ensures long-term reliability in demanding industrial environments, reducing maintenance needs and downtime.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC coarse thread with a Class 3A thread fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 3/16" with a tolerance of -0.005" to 0.005". It is manufactured in accordance with ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.