ND Patch®


ND Patch is a pre-applied threadlocking coating (typically Nylon), which is fused to internal or external threads of a fastener. ND Patch is dry to the touch and ready for use right out of the box. Unlike reactive thread lockers, ND Patch performs immediately upon assembly with no curing time required.

Product Information

How It Works

When assembled with a mating part, ND Patch is compressed. The engineered plastic (typically a Nylon Patch) 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 is commonly known as a prevailing torque type self-locking fastener.


Fasteners coated with ND Patch can be repeatedly installed and removed without damage to threads. ND Patch is particularly resistant to deformation, which makes it ideal for reuse.

Chemical Resistant

ND Patch will not dry, shrink, or lose resiliency when exposed to commercial solvents, alcohol, gasoline, oil, caustic soda, jet fuel, etc.

Resists Heat And Cold

ND Patch 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).

Retains Full Strength

ND Patch process involves no drilling or milling, so there is no loss of the fastener's strength or hardness and no troublesome burrs or chips.

Improved Sealing

ND Patch seals along the thread helix and can be increased by completely coating the fastener 360° with nylon.

Proven Product

ND Patch is one of the oldest and most popular pre-applied threadlocking products on the market.

Other Benefits

  • Saves Time: Fasteners coated with ND Patch 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 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.
  • Operator Friendly: ND Patch reduces fatigue by greatly reduces the need for re-tightening. Is also non-toxic and safe to handle.
  • Increased Margins: Add value to your fasteners without adding to inventory by supply customers with self-locking fasteners.
  • Easy to use: Works on a wide range of material finishes


  • ND Patch and ND Patch 360° Ring are 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.
  • As with all our pre-applied products, ND Industries can apply ND Patch onto your fasteners at any one of our regional service centers, or we can supply you with fasteners that contain a pre-applied ND Patch.
  • All fasteners should be from the same lot to insure consistent induction heating during the application process.

ND Patch Competes With

  • Nylok® Blue Patch
  • Nylok® Tuflok®
  • Nylok® Torq-Patch® Lock-Nut
  • Forest City Technologies Astorlok™
  • Forest City Tecnologies Eslok®


Steering Columns, Engine Applications, Brakes, Rear-End, Transmissions, Areas of Vibration, Areas of Heat, Military Fasteners

Compatible Fasteners

External Threads:

Banjo Bolts, Double Ended Studs, Hex Bolts, Flange Bolts, Wheel Bolts, Machine Screws, Cap Screws, Wood Screws, Sheet Metal Screws, Self Drilling Screws, Shoulder Bolts, Tube Nuts, Carriage Bolts, Lag Bolts, Socket Screws, Set Screws, Eye Bolts, Eye Lags, J-Bolts, U-Bolts, Shoulder Bolts, Elevator Bolts, Hanger Bolts.

Internal Threads:

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

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.


Automotive Specifications

ND Patch meets or exceeds the performance requirements of the following specifications and/or standards

  • Chrysler: PF-4730, PF-5077, PF-5144, PF-5461, PF-5683, PF-6157, PF-6158
  • Ford: ES-21002-S100, ES-21002-S100, ES-382101-S100, ES-N800688-S100, WA 970
  • General Motors: GM 6189P

Military Specifications

ND Patch meets or exceeds the performance requirements of the following specifications and/or standards

  • U.S. Military: MIL-N-25027, MIL-F-18240E, MIL-DTL-18240F

Industrial Specifications

ND Patch meets or exceeds the performance requirements of the following specifications and/or standards

  • DIN: 267 Part 28
  • IFI: 100
  • IFI: 124

OEM Specifications

ND Patch meets or exceeds the performance requirements of the following specifications and/or standards

  • John Deere: JDT905
  • Mack Trucks: 3/6 AXS5, 10 AMS1
  • Bendix: WI-287, UI-146
  • Meritor (Rockwell): Q-70
  • Case IH: BM-050
  • Clark Equipment: 95G-96G, 81D-82D

  • Detroit Diesel: 9S240
  • Eaton: 205372
  • Kelsey – Hayes: B-3736
  • Navistar: Noun Code 0810
  • New Process Gear: PS-616
  • Outboard Marine: 1767

Patch Reusability Test

Tech Data

ProductColorReusabilityLead ThreadsCoating LengthHardness Salt Spray ResistanceTemp MinTemp Max
ND Patch (Nylon)Yellow (other colors available)15 Cycles1 to 34 to 6 ThreadsShore D 70-80*1,000+ hours**-70°F (-57°C)250°F (120°C)

*(ASTM D2240) **ASTM B117 (X scribe)

Safety, Technical & Product Data Sheets

Process NameMaterialSafety Data Sheet (Applied)Technical Data Sheet (Applied)Product Data Sheet
ND Patch®ND Patch (Nylon)ND3141ND Patch - PDS

Increase product quality while saving time and money with Pre-Applied adhesives and sealants.