S-97768A333 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.
• High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, heavy-duty load-bearing applications.
• Precise alignment and pivot function enabled by the 3" shoulder with tight diameter tolerance, reducing component wear.
• Easy installation and removal with a 5/32" hex socket drive and knurled head for improved grip and torque application.
• Consistent thread performance due to Class 3A fit and 1/4"-20 UNC coarse threads, ensuring secure fastening in various materials.
• Enhanced durability from Rockwell B55 hardness, providing long service life under repetitive stress.
• Regulatory compliance meeting ASME B18.3 standards and RoHS 3/REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and durability challenges in industrial applications. The 18-8 stainless steel material combined with a black oxide finish provides excellent resistance to corrosion and oxidation, making it suitable for machinery, automotive assemblies, and outdoor equipment. The 3" shoulder length with precise tolerances acts as a pivot or spacer, minimizing misalignment and reducing wear on moving parts. Its UNC coarse threads and Class 3A fit ensure quick, secure fastening, while the knurled head and hex socket drive facilitate easy handling in tight spaces. Ideal for use in precision shoulder bolts applications, this screw enhances operational reliability and reduces maintenance needs.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit for high precision, a shoulder diameter of 5/16" with tolerance from -0.004" to -0.002", and a shoulder length of 3" with tolerance from -0.005" to 0.005". It complies with ASME B18.3 specifications for dimensional accuracy and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring adherence to industry and environmental standards.