S-91835A488 4-40 Press-Fit Nuts

Key Features & Benefits at a Glance

• Secure Vibration Resistance: Nylon insert provides reliable locking action, preventing loosening under dynamic loads and vibrations in industrial environments.
• Simplified Permanent Installation: Press-fit design enables quick, tool-efficient assembly into panels, reducing labor time and eliminating the need for welding or adhesives.
• Enhanced Load Distribution: Round flange with 0.2" diameter increases bearing surface, minimizing the risk of panel damage and pull-through under high stress.
• High-Temperature Suitability: Nylon insert rated for temperatures up to 250°F ensures consistent locking performance in demanding thermal conditions.
• Precision Thread Compatibility: 4-40 UNC coarse threads with Class 2B fit guarantee easy engagement and reliable fastening with standard male threaded components.
• Optimized for Thin Panels: Designed for a minimum panel thickness of 0.06" with 5/32" drill bit compatibility, providing a robust threaded solution for sheet metal applications.
• Environmentally Compliant Material: Steel construction meets RoHS 3 and REACH standards, ensuring safety and regulatory adherence for global industrial supply chains.

Professional Applications & Engineering Value

These 4-40 UNC press fit nuts are engineered to solve critical challenges in electrical enclosures, automotive assemblies, and machinery panels where reliable, permanent threaded points are essential. The steel construction and round flange design prevent rotation and distribute clamp load effectively, protecting thin materials from deformation. The nylon insert locking mechanism maintains bolt pre-load in high-vibration environments, eliminating the need for secondary locking devices. With a coarse thread profile and Class 2B fit, installation is swift and dependable, reducing assembly errors. Rated for 250°F, these locknuts perform consistently in applications exposed to moderate heat, making them a versatile, high-value component for OEMs and maintenance teams seeking durable, compliant fastening solutions.

Specification Summary & Compliance

This product features UNC coarse threads in size 4-40 with a Class 2B thread fit for consistent mating. The press-fit installation requires a 5/32" drill bit (0.1563" diameter) for a 0.06" minimum panel thickness. Manufacturing and material compliance include RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring adherence to environmental and safety regulations for industrial components.