S-90318A201 4-40 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 316 Stainless Steel construction, ideal for harsh environments and chemical exposure
- Exceptional mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable performance under high stress
- Precise alignment and spacing ensured by the accurately machined shoulder with tight diameter and length tolerances
- Flush, low-profile installation enabled by the ultra-low socket head, perfect for compact assemblies and smooth surfaces
- Enhanced durability and wear resistance from the passivated finish and Rockwell B70 hardness
- Broad compatibility with UNC coarse threading and Class 2A fit for easy assembly and interchangeability
- Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe, environmentally conscious usage
Professional Applications & Engineering Value
This 4-40 UNC shoulder screw in 316 Stainless Steel is engineered to address critical industrial challenges, such as component misalignment and corrosion-induced failure. Its precise shoulder fit provides exact positioning in machinery, pivots, and rotating assemblies, reducing wear and maintenance. The passivated finish enhances corrosion resistance, making it suitable for marine, chemical processing, and food-grade equipment. With an ultra-low socket head and hex drive, it allows for secure, flush mounting in tight spaces, ensuring a smooth surface finish and preventing snagging. Ideal for applications requiring high strength and dimensional accuracy, this screw delivers long-term reliability in demanding environments.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder features precise tolerances: diameter of 1/8" (-0.001" to 0") and length of 1/8" (0" to 0.002"). Manufactured from 316 Stainless Steel with a passivated finish, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.
