S-90337A392 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
• Enhanced durability and strength with 70,000 psi tensile strength and Rockwell B55 hardness for long-lasting performance
• Precise alignment and reduced wear due to the accurately machined shoulder with tight diameter and length tolerances
• Low-profile socket head design allows for installation in confined spaces while providing reliable hex drive engagement
• Consistent thread performance with UNC coarse threads and Class 2A fit ensuring secure fastening and easy assembly
• Compliance with environmental regulations including RoHS 3 and REACH, making it suitable for global industrial applications
• Optimized for high-stress applications where reliable shoulder screw performance is critical for machinery and equipment

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw is engineered to address common industrial challenges such as misalignment, vibration loosening, and corrosion. The 18-8 stainless steel material combined with a passivated finish provides excellent resistance to rust and chemicals, extending service life in demanding conditions. Its low profile socket head and precise shoulder fit ensure accurate component positioning, reducing wear on mating parts. Commonly used in precision machinery, automation systems, and electronic enclosures, this shoulder screw offers reliable performance where strength and dimensional accuracy are paramount. The coarse UNC threads facilitate quick assembly, while the robust design supports heavy-duty applications without failure.

Specification Summary & Compliance

The shoulder screw features a Class 2A thread fit per UNC standards, ensuring consistent threading and ease of installation. Shoulder dimensions are manufactured to tight tolerances: diameter of 1/8" (-0.001" to 0") and length of 1 1/8" (0" to 0.002") for precise fit. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious industries. Manufactured to high-quality standards, this fastener meets the requirements for industrial applications demanding reliability and safety.