S-93691A150 4-40 MS51576-5, NASM51576 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance through 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Precise component alignment with exact 1/8" shoulder diameter and 3/8" shoulder length maintaining tight tolerances for reliable assembly
• Exceptional mechanical strength delivering 70,000 psi tensile strength and Rockwell B55 hardness for heavy-duty applications
• Secure drive engagement with hex socket design preventing cam-out and ensuring consistent torque application
• Reliable thread performance through Class 2A UNC coarse threads providing vibration resistance and easy installation
• Regulatory compliance assurance meeting MS51576-5, RoHS 3, and REACH standards for global industrial use
• Optimized for automated assembly with right-hand thread direction and standard socket head profile for manufacturing efficiency

Professional Applications & Engineering Value

This precision shoulder screw delivers critical engineering value in applications requiring exact axial positioning and rotational stability. The 18-8 stainless steel material combined with passivated finish solves corrosion-related failure points in manufacturing equipment, automotive assemblies, and precision instruments. The 1/8" shoulder diameter with precise fit tolerance ensures components maintain perfect alignment under operational stress, while the 3/8" shoulder length provides consistent bearing surfaces for rotating parts. The UNC coarse thread design with Class 2A fit prevents loosening in high-vibration environments, making these socket head shoulder screws ideal for precision machinery, robotic systems, and aerospace applications where reliability is paramount.

Specification Summary & Compliance

This 4-40 UNC shoulder screw maintains Class 2A thread fit per UNC standards with precise shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002". Manufactured to MS51576-5 specification with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. The screw features right-hand thread direction with coarse thread spacing and meets mechanical properties including Rockwell B55 hardness and 70,000 psi tensile strength.