ND Patch® Hi-Temp

Application of custom nylon material to fasteners to make them self-locking and sealing at temperatures up to 500°F


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.

How it Works

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.


High Temp Resistance

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.

Low Application Temp

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.

Retains Full Strength

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.

Chemical Resistant

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.

Improved Sealing

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°.


  • Saves Time: Pre-Applied ND Patch Hi-Temp fasteners can be automatically fed through standard feeding devices and require no cure time after installation.
  • Saves Money: Eliminates the need for costly lock washers, cotter pins, or castellated nuts. Moreover, ND Patch Hi-Temp is less expensive than applying bottled threadlockers at the point of assembly.
  • Quality Control: Pre-Applied parts are coated to specification, insuring consistent performance unlike bottled products. ND Patch application area and torque can be customized to meet specific needs.
  • In-Line Inspection: During the ND Patch Hi-Temp process, camera systems are used to verify parts are coated exactly to customer’s specifications. This often removes a secondary sorting operation at the end customer.
  • Fast Turn-Around: The ND Patch Hi-Temp process produces a complete, non-chemically reactive, ready to use product. ND Patch Hi-Temp performs immediately upon assembly. There is no cure time required.


  • Nylon is normally positioned one to three threads back from the end of the fastener to assure ease of starting.
  • The normal coating length of the Patch is four to six threads. Special Patch location and coating length can be specified for specific applications.
  • Indefinite on part life under ideal storage conditions [+40°F (+4°C) to +90°F (+32°C)], but re-certification must occur once a year.
  • All fasteners should be from the same lot to insure consistent induction heating during the application process.
  • To adjust for torque generated by patch, see the chart here.

ND Patch Hi-Temp Competes With

  • Nylok® Nytemp®

Nylok® and Nytemp® are registered trademarks of Nylok LLC,


Engine Applications, Brakes, Rear-End, Transmissions, Areas of Vibration, Areas of Heat

ND Patch Hi-Temp Reusability

Compatible Fasteners

External Threads:Internal Threads:Rivets:
Banjo Bolts, Hex Bolts, Flange Bolts, Wheel Bolts, Machine Screws, Cap Screws, Wood Screws, Sheet Metal Screws, Self Drilling Screws, Shoulder Bolts, Tube Nuts, Fully Threaded Studs, Double Ended Studs, Singled Ended Studs, Press-In Captive Studs, Carriage Bolts, Lag Bolts, Socket Screws, Set Screws, Eye Bolts, Eye Lags, J-Bolts, U-Bolts, Elevator Bolts, Hangar Bolts, Perforated Base Studs, Through Hole Weld Studs.Flange Nuts, Hex Body Clinch Nuts, Prevailing Torque Nuts, Floating Nuts, Hollow Bolts, Insert Nuts, Lock Nuts, Weld Nuts, Barrel Nuts, Chicago Bolts, Jam Nuts, Wing Nuts, Square Nuts, Self-Locating Projection Weld Nuts (WN/WNS), Spot Weld Nuts, Projection Weld Nuts, Bridge Spot Weld Nuts, Tab Spot Weld Nuts, Square Projection Weld Nuts, Flange Weld Projection Nuts, Stamped Flange Weld Nuts, Spot Weld Cage Nuts.N/A

Don’t see your parts on this list? We process thousands of different types of fasteners and depending on the quantity will gladly look at whether we can accommodate yours as well.

Technical Data

ProductColorReusabilityLead ThreadsCoating LengthHardnessSalt Spray ResistanceTemp MinTemp Max
ND Patch Hi-Temp (Reinforced Nylon)Orange and Gray*5 Cycles1 to 34 to 6 ThreadsShore D 70-80**1,000+ hours***-70°F (-57°C)500°F (260°C)

* QPL-18240-33 & MIL-DTL-18240F require gray nylon;  **(ASTM D2240);  ***ASTM B117 (X scribe)


Particular formulations of ND Patch Hi-Temp meet or exceed the performance requirements of the following specifications and/or standards:

Spec ForSpec NumberND ProcessND Material
DINDIN 267 Part 28ND PatchND Patch Hi-Temp
IFIIFI-100 (NUTS)ND PatchND Patch Hi-Temp
IFIIFI-124 (INCH)ND PatchND Patch Hi-Temp
IFIIFI-524 (METRIC)ND PatchND Patch Hi-Temp
US MilitaryMIL-DTL-18240ND PatchND Patch Hi-Temp

Safety, Technical & Product Data Sheets

Process NameMaterialSafety Data Sheet (Applied)Technical Data Sheet (Applied)Process Data Sheet
ND Patch® Hi-TempND Hi-Temp (Reinforced Nylon)ND Patch Hi-Temp (Applied)ND Patch Hi-Temp - TDS (Applied)ND Patch Hi-Temp - PDS
Increase product quality while saving time and money with Pre-Applied adhesives and sealants.