S-94035A611 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 environments
- Precise component alignment ensured by the smooth, precisely toleranced shoulder with minimal diameter variation
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for reliable load-bearing applications
- Secure, flush installation facilitated by the standard hex socket head requiring only a 5/64" drive tool
- Consistent, reliable threading with Class 2A fit UNC coarse threads for easier assembly and vibration resistance
- Environmental regulation compliance meeting RoHS 3 and REACH standards for safe, sustainable industrial use
- Optimized for automated assembly with right-hand thread direction and standardized socket head profile
Professional Applications & Engineering Value
This 4-40 UNC stainless steel shoulder screw addresses critical alignment challenges in precision assemblies. The 1 1/4" shoulder length with tight tolerances provides an exact pivot point or spacer, eliminating component misalignment in machinery, robotics, and electronic enclosures. Manufactured from 18-8 stainless steel with a passivated finish, it resists oxidation and chemical exposure, extending service life in demanding conditions. The hex socket head allows for high-torque installation in confined spaces, while the Class 2A thread fit ensures consistent engagement without cross-threading. These features make it indispensable for maintaining dimensional stability under dynamic loads in automotive, aerospace, and industrial equipment applications.
Specification Summary & Compliance
This 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". It conforms to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental compliance. The manufacturing process adheres to industry standards for dimensional accuracy and mechanical properties, including the specified tensile strength and hardness metrics.
