S-91835A520 4-40 Press-Fit Nuts

Key Features & Benefits at a Glance

• Vibration-resistant performance with nylon insert locking that maintains integrity up to 250°F, preventing loosening in high-stress environments
• Durable 18-8 stainless steel construction provides excellent corrosion resistance and long-term reliability in harsh industrial conditions
• Precision Class 3B threads ensure superior fit and consistent torque performance with UNC coarse spacing for faster assembly
• Press-fit round head design with 0.2" flange diameter creates secure, permanent installation without additional fastening hardware
• Optimized for thin panel applications with 0.06" minimum thickness requirement and 5/32" drill compatibility for streamlined installation
• Right-hand thread orientation with coarse spacing enables quick installation and removal while maintaining secure locking
• Compliant with industry standards including REACH and RoHS 3, ensuring environmental responsibility and global acceptance

Professional Applications & Engineering Value

This 4-40 UNC press-fit locknut delivers exceptional engineering value in applications where vibration resistance and permanent fastening are critical. The nylon insert locking mechanism provides reliable performance up to 250°F, making it ideal for electronic enclosures, control panels, and machinery where thermal cycling and constant motion would compromise standard fasteners. Manufactured from 18-8 stainless steel, this press-fit nut withstands corrosive environments while the round head design with 0.2" flange diameter distributes load evenly across panels. The Class 3B thread precision combined with UNC coarse threading ensures perfect mating with corresponding components, reducing installation time and eliminating the need for additional locking devices. Particularly valuable in panel mounting applications requiring 0.06" minimum thickness, this fastener provides a permanent, vibration-proof solution that maintains integrity through demanding operational cycles.

Specification Summary & Compliance

This press-fit nut features Class 3B thread fit precision with UNC coarse thread spacing (4-40 size) and right-hand orientation. The manufacturing complies with REACH (EC 1907/2006) regulations and RoHS 3 (2015/863/EU) directives, ensuring environmental compliance for global industrial applications. Dimensional specifications include 0.2" flange diameter, 0.09" head height, and compatibility with 5/32" drill bits (0.1563" diameter) for standard panel installations requiring 0.06" minimum thickness.