ND Patch® Hi-Temp is a high temperature pre-applied threadlocking coating which is fused to internal or external threads of a fastener, making it self-locking and self-sealing. Dry to the touch and ready for use, ND Patch performs immediately upon assembly with no curing time required.
During the ND Patch Hi-Temp pre-applied process, fasteners are heated and sprayed with a custom nylon powder which adheres to the threads. The melted nylon formula cross-links, which causes it to strengthen. Once cooled, the material can then withstand higher temperatures than that at which it was melted. When assembled with a mating part, the nylon patch is compressed. This compression creates a dam-like action on the opposite side of the coated fastener, creating very strong metal-to-metal contact.
Applied fasteners maintain their torque performance through temperatures as low as -70°F (-56°C) and as high as +500°F (+260°C). ND Patch Hi-Temp is the highest temp nylon available.
Unlike many other high temp nylon threadlockers, the ND Patch Hi-Temp process requires fasteners only be heated to 250°F during application. This minimizes potential damage to the fastener and its finish.
ND Patch Hi-Temp pre-applied fasteners can be re-used repeatedly without damage to the threads. ND Patch Hi-Temp is particularly resistant to deformation, which makes it ideal for reuse.
ND Patch Hi-Temp processing involves no drilling or milling, so there is no loss of the fastener’s strength or hardness and no troublesome burrs or chips.
The nylon used in ND Patch Hi-Temp will not dry, shrink, or otherwise be effected when exposed to commercial solvents, alcohol, gasoline, oil, caustic soda, jet fuel, etc.
Nylon is typically applied 90° which helps prevent gas and fluid leakage along the thread helix. However sealing functionality can be increased by completely coating the fastener 360°.