S-94035A138 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 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
- Precise component alignment ensured by the smooth, accurately machined shoulder with tight diameter and length tolerances.
- High-strength performance offering 70,000 psi tensile strength and Rockwell B55 hardness for reliable, durable fastening.
- Easy installation and removal with a standard hex socket drive, reducing assembly time and tool wear.
- Consistent thread engagement provided by the UNC coarse thread and Class 2A fit, minimizing cross-threading risks.
- Regulatory compliance meeting RoHS 3 and REACH standards for safe use in various global markets.
- Versatile right-hand threading compatible with standard components, simplifying inventory and replacement.
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 material, combined with a passivated finish, provides excellent resistance to corrosion and wear, extending service life in demanding conditions like machinery, automotive, and electronics. The precisely controlled 1/8" shoulder diameter and 3/4" shoulder length with minimal tolerances ensure accurate positioning of moving parts, reducing vibration and misalignment. Its socket head with hex drive allows for secure tightening in confined spaces, making it ideal for applications requiring reliable, repeatable fastening without compromising performance.
Specification Summary & Compliance
This shoulder screw adheres to UNC thread standards with a Class 2A thread fit for consistent engagement. The shoulder features precise diameter and length tolerances (e.g., shoulder diameter: -0.001" to 0", shoulder length: 0" to 0.002") to ensure accurate assembly. It is manufactured from 18-8 stainless steel with a passivated finish, delivering a tensile strength of 70,000 psi and Rockwell B55 hardness. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it meets environmental and safety standards for industrial use.
