S-97768A310 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.
• Precise alignment and reduced wear thanks to the knurled head and standard shoulder fit, ensuring stable component positioning.
• High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications.
• Reliable thread engagement achieved through Class 3A thread fit and UNC coarse threads, minimizing loosening under vibration.
• Easy installation and removal with a 5/32" hex socket drive, allowing for high torque application in confined spaces.
• Consistent performance backed by Rockwell B55 hardness, providing excellent durability and resistance to deformation.
• Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for safe, global use.

Professional Applications & Engineering Value

This shoulder screw is engineered to address critical alignment and load distribution challenges in precision assemblies. The 18-8 stainless steel material, combined with a black oxide finish, offers exceptional corrosion resistance, making it suitable for automotive, aerospace, and machinery applications exposed to moisture and chemicals. The 3/4" shoulder length and precise diameter tolerances ensure accurate pivot points and bearing surfaces, reducing wear on moving parts. With a Class 3A thread fit and UNC coarse threads, it provides secure fastening in high-vibration environments, while the knurled head enhances grip during manual adjustments. Ideal for use in jigs, fixtures, and rotating mechanisms, this screw delivers long-term reliability and minimizes maintenance needs.

Specification Summary & Compliance

This shoulder screw features a 1/4"-20 UNC thread with Class 3A fit and coarse spacing for secure fastening. Shoulder dimensions include a diameter of 5/16" with tolerance of -0.004" to -0.002" and length of 3/4" with tolerance of -0.005" to 0.005". It complies with ASME B18.3 manufacturing standards and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.