LAC-0428-2MD - Floating self-clinching, locking thread nut by PennEngineering ® (PEM ® )

The PEM® LAC-0428-2MD is a self-locking, floating self-clinching nut designed to provide strong, load-bearing threads in thin metal sheets. This fastener is finished with a Dry Film Lubricant (MD) and features a prevailing torque-locking element to ensure assembly integrity under high-vibration conditions. It permits up to .030” (0.76 mm) total adjustment to compensate for mating hole misalignment. Utilizing a unique PEM design where the threads extend fully into the retainer shank, it offers enhanced strength and engagement. The part is installed by being squeezed into prepared holes using a standard press, causing the host material to cold-flow into an undercut for permanent locking, while maintaining a flush profile on the reverse side of the sheet.

Misalignment Compensation: Provides .015” minimum float in all directions from center (.030” total) to account for mating hole inaccuracies.

Self-Locking Thread: Prevailing torque-locking mechanism provides secure fastening and prevents loosening due to vibration.

Dry Film Lubricant: Coated with MoS2 (molybdenum disulfide) dry film lubricant to ensure consistent torque-tension and ease of assembly.

Enhanced Support: Features threads that extend fully into the retainer shank for superior strength and thread engagement.

Flush Installation: The reverse side of the mounting sheet remains entirely flush, allowing for clean, unobstructed assemblies.

NASM - Products meet Military Specifications (MS) and National Aerospace Standards (NAS) requirements as applicable and are shipped with appropriate documentation.