S-91327A283 4-40 ASME B18.3 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
- Vibration-resistant locking with nylon patch thread locker to prevent loosening in dynamic applications, maintaining secure fastening from -50° to 250°F.
- Superior corrosion resistance from 18-8 stainless steel and passivated finish, ensuring long-term reliability in harsh industrial environments.
- High tensile strength of 70,000 psi for dependable performance under heavy loads, reducing the risk of fastener failure.
- Precision Class 3A thread fit for smooth assembly and consistent engagement, minimizing installation errors and rework.
- Socket head design with hex drive allows for easy installation in confined spaces using standard 5/64" tools.
- Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations for global use.
- Durable Rockwell B55 hardness provides excellent wear resistance, extending service life in high-stress applications.
Professional Applications & Engineering Value
This 4-40 UNC thread shoulder screw is engineered to address common industrial challenges such as vibration-induced loosening and corrosion in machinery assemblies. The nylon patch thread locker securely locks the screw in place, making it ideal for automotive, aerospace, and precision equipment where stability is critical. Made from 18-8 stainless steel with a passivated finish, it resists rust and chemical exposure, ensuring reliability in demanding environments. The socket head and hex drive facilitate quick installation in tight spaces, while the shoulder design provides precise alignment for rotating components like bearings and pulleys, reducing wear and maintenance costs.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit for high precision and smooth assembly, with UNC coarse threads for robust engagement. It complies with ASME B18.3 manufacturing standards, ensuring dimensional accuracy and performance. The product is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety regulations for hazardous substances.
