S-96655A113 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction for reliable performance in demanding environments
• Precise component alignment through 1/4" shoulder diameter with tight tolerances for accurate positioning in assemblies
• Enhanced grip and torque application with knurled hex socket head design for secure installation and removal
• High mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Optimized thread engagement with 4-40 UNC coarse threading and Class 2B fit ensuring secure fastening in various materials
• Versatile partial threading allowing both precise shoulder positioning and secure thread engagement in single component
• Environmental compliance assurance meeting RoHS 3 and REACH standards for global manufacturing requirements

Professional Applications & Engineering Value

This 18-8 stainless steel shoulder screw delivers exceptional engineering value in precision mechanical assemblies where accurate component positioning is critical. The 1/4" shoulder diameter with tight manufacturing tolerances provides a precise bearing surface for rotating components, eliminating the need for additional spacers or bushings. The 4-40 UNC coarse threading with Class 2B fit ensures reliable fastening in various materials while the partially threaded design allows the unthreaded shoulder section to act as a pivot point or alignment feature. The hex socket knurled head offers superior torque transmission and grip during installation, making it ideal for industrial machinery, precision instruments, and mechanical linkages where vibration resistance and positional accuracy are paramount. The corrosion-resistant properties of 18-8 stainless steel ensure long-term reliability in harsh operating conditions.

Specification Summary & Compliance

This precision shoulder screw features 4-40 UNC coarse threading with Class 2B thread fit and right-hand thread direction. Critical dimensions include 1/4" shoulder diameter with tolerance of -0.004" to -0.002" and 1" shoulder length with tolerance of -0.005" to 0.005". The fastener meets RoHS 3 (2015/863/EU) compliance and REACH (EC 1907/2006) compliance, ensuring environmental regulatory adherence for global industrial applications. Manufactured to deliver 70,000 psi tensile strength with Rockwell B55 hardness rating.