ND Patch is a pre-applied process which fuses a nylon threadlocking coating to internal or external threads of fasteners making them self-locking and self-sealing (also known as a prevailing torque type fasteners). ND Patch fasteners are dry to the touch and ready for immediate use and unlike reactive thread lockers, require no cure time after installation.
During the ND Patch pre-applied process, fasteners are heated and sprayed with a custom nylon powder which adheres to the part. When assembled with a mating part, the engineered plastic nylon patch is compressed. Due to the elastic memory it resists this compression and acts like a wedge, increasing the metal to metal contact 180° opposite the material. This mechanical force creates a strong, yet fully adjustable lock which will not weaken, even under extreme vibration.
ND Patch pre-applied fasteners can be repeatedly installed and removed without damage to threads. ND Patch fasteners are particularly resistant to deformation, which makes it ideal for reuse.
The nylon applied in ND Patch processing will not dry, shrink, or lose resiliency when exposed to commercial solvents, alcohol, gasoline, oil, caustic soda, jet fuel, etc.
Meets and exceeds IFI Specifications 124 & 524 as well as Military specification MIL-DTL-18240F, Type P, for temperatures from -70°F (-56°C) to +250°F (121°C).
The ND Patch process involves no drilling or milling, so there is no loss of fastener strength or hardness and no troublesome burrs or chips.
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°.
ND Patch is one of the oldest and most popular pre-applied threadlocking processes on the market. When female fasteners are coated, they function as an excellent alternative to nylon insert lock nuts.