S-97768A301 1/4"-20 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under high stress.
• Precise alignment and reduced wear due to the 5/16" shoulder diameter with tight tolerances, ensuring stable component positioning.
• Easy installation and removal with a hex drive socket head and knurled texture for improved grip and torque application.
• Consistent thread engagement via 1/4"-20 UNC coarse thread with Class 3A fit, minimizing loosening in vibrating applications.
• Broad compliance assurance meeting ASME B18.3 standards, RoHS 3, and REACH for safe, regulated use in global markets.
• Enhanced durability from Rockwell B55 hardness, providing long-lasting service in repetitive assembly operations.

Professional Applications & Engineering Value

This black oxide shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure. The 18-8 stainless steel material, combined with a black oxide finish, offers excellent resistance to rust and wear, making it suitable for automotive, machinery, and electronics assemblies where exposure to moisture or chemicals is a concern. The 5/16" shoulder diameter provides a precise pivot or bearing surface, reducing friction and extending the life of moving parts. With a UNC coarse thread and Class 3A fit, it ensures quick, secure fastening in high-vibration environments, while the socket head with hex drive allows for efficient installation in confined spaces. Ideal for precision shoulder screw applications, this component delivers reliable performance in jigs, fixtures, and rotating mechanisms, enhancing overall equipment efficiency and reducing maintenance downtime.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005", ensuring high accuracy for industrial shoulder screws. It adheres to UNC thread standards with a Class 3A fit for superior thread engagement. Manufactured in compliance with ASME B18.3 specifications, it is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for global industrial use.