S-93691A120 4-40 MS51576-2, NASM51576 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 18-8 stainless steel and passivated finish, ideal for harsh environments
- Precise alignment and secure positioning due to the 1/8" shoulder diameter with tight tolerance for minimal play
- High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for demanding applications
- Easy installation and removal with the hex socket head design, accommodating standard 5/64" drive tools
- Reliable thread engagement from the 4-40 UNC coarse thread and Class 2A fit, ensuring consistent fastening
- Compliance with industry standards including MS51576-2, RoHS 3, and REACH for quality and environmental safety
- Durable and long-lasting performance in right-hand thread applications, reducing maintenance needs
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 18-8 stainless steel construction, combined with a passivated finish, provides excellent resistance to corrosion and wear, making it suitable for machinery, automotive assemblies, and electronic enclosures exposed to moisture or chemicals. The 1/8" shoulder diameter with precise tolerances ensures accurate component positioning, minimizing vibration and misalignment issues. Its hex socket head allows for efficient torque application in confined spaces, while the coarse UNC thread facilitates quick assembly. Ideal for precision fastening in robotics, aerospace, and manufacturing equipment, this screw enhances operational reliability and reduces downtime.
Specification Summary & Compliance
The screw features a Class 2A thread fit and UNC thread standards, ensuring dimensional accuracy and interchangeability. It meets MS51576-2 specifications for consistent quality and performance. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations confirms adherence to environmental and safety standards, free from hazardous substances. The shoulder dimensions, including diameter and length tolerances, support precise engineering applications.
