S-94035A517 4-40 MS51576-4, 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 component alignment ensured by a smooth, accurately machined shoulder with minimal diameter and length tolerances.
- High mechanical strength offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, long-term performance.
- Easy installation and removal with a standard hex socket drive, reducing assembly time and tool slippage.
- Wide compatibility due to 4-40 UNC coarse threads with Class 2A fit, facilitating quick assembly in various industrial applications.
- Regulatory compliance meeting MS51576-4, RoHS 3, and REACH standards for safe, global use.
- Durable right-hand threading providing consistent fastening in dynamic or high-vibration settings.
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel construction, enhanced by a passivated finish, resists oxidation and chemical exposure, making it suitable for aerospace, automotive, and electronics industries. Its 1/8" shoulder diameter and 5/16" shoulder length with tight tolerances ensure exact positioning of components like gears, bearings, and linkages, minimizing wear and misalignment. The hex drive socket head allows for secure torque application in confined spaces, while the coarse UNC threads enable rapid installation without compromising holding power. Ideal for machinery requiring repeated disassembly, this screw enhances operational reliability and reduces maintenance costs.
Specification Summary & Compliance
This shoulder screw adheres to Class 2A thread fit and UNC standards, with precise shoulder diameter tolerance of -0.001" to 0" and shoulder length tolerance of 0" to 0.002". It conforms to MS51576-4 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
