ND Strip®


Normally a resilient bar of Nylon that is inserted into a slot which has been milled into a threaded fastener, ND Strip makes fasteners self-locking, self-sealing, and yet fully adjustable. Ideal for all types and sizes of commercial, automotive, and aerospace fasteners, ND Strip delivers outstanding performance in both high and low temperature extremes. Due to its compressibility, resiliency, and resistance to deformation, fasteners using ND Strip can be repeatedly removed and adjusted.

How it Works

Customer fasteners are first sent to ND for processing. Using custom equipment we mill a slot into the fastener threads, deburr any edges, then have the part sent out for re-plating if necessary. Next a tough strip typically made of nylon is inserted into the slot. Completed parts are shipped back to the customer. When assembled with a mating part the resilient nylon is compressed. This compression exerts a force 180° opposite, increasing metal to metal contact and holding the fastener in place without adhesives or thread distortion. The engineered plastic strip provides locking action in the thread instead of at the bearing surface.


Wide Adjustment Range

ND Strip processed fasteners have a wider range of adjustment and larger working area than most other locking elements due to the fact that the insert runs parallel to the length of the fastener.

Resists Heat and Cold

Nylon ND Strip meets and exceeds MIL-DTL-18240F, Type L for temperatures up to +250°F (+121°C). Using other materials, ND Strip can withstand temperatures as high as +1,200°F (+649°C).

Resists Chemicals

Nylon is virtually impervious to a wide range of chemicals, water, and motor fluids. Will not dry, shrink, or lose resiliency when exposed to commercial solvents, alcohol, gasoline, oil, caustic soda, jet fuel, and many other chemicals.

Outstanding Reusability

Due to its resiliance, nylon strip inserts can be adjusted and removed several times without substantially decreasing the fasteners locking ability and without damage to threads.

Easy to Customize Torque

ND Strip processing can be customized to meet your specific requirements by adjusting the length and diameter of the installed material.

Substrate Independent

ND Strip processing is excellent for use on non-metallic fasteners where a chemical threadlocker could deteriorate the substrate.

Pre-Applied Benefits

  • Saves Time: ND Strip fasteners can be fed through an automated feeding device to improve your productivity and save time.
  • Saves Money: ND Strip processing works with virtually any fastener (standard or special). ND Strip fasteners eliminate the need for costly lock-washers, cotter pins, or castellated nuts. Achieve close fits without the expense involved in attaining close tolerances.
  • Quality Control:  Fastener processing is done to specification, insuring consistent performance unlike bottled products.
  • Saves Effort: ND Strip processed fasteners greatly reduce the need for retightening..
  • Won’t Work Loose: Under most operating conditions, nylon strips are unaffected by vibration or reversal of stress.

Processing Notes

  • ND Strip processing is also available with KEL-F®, Vespel®, Copper, Stainless Steel, and PTFE materials for non-standard applications.
  • Strips are normally positioned one to three threads back from the end of a fastener to assure ease of starting. Special positioning can be specified for specific applications. Strip location and diameter can be tailored to fit your needs.

ND Strip Competes With

  • (Nylon 6/6) – Nylok® Torq Strip®
  • (Nylon 6/6) – “Long-Lok”® Inserts

Nylok®, and Torq Strip® are registered trademarks of Nylok LLC, USA. “Long-Lok” is a registered trademark of Long-Lok Fasteners Corporation.


Millitary Fasteners

Compatible Fasteners

External Threads:Internal Threads:Rivets:
Banjo Bolts, Hex Bolts, Flange Bolts, Wheel Bolts, Machine Screws, Cap Screws, Wood Screws, Sheet Metal Screws, Shoulder Bolts, 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.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

MaterialReusabilityTemp MinTemp MaxColor
Copper5 Cycles-400°F (-240°C)800°F (430°C)Copper
Neoflon® (KEL-F®)0 Cycles-320°F (-200°C)390°F (200°C)Blue
Nylon 6/615 Cycles-65°F (-54°C)250°F (120°C)Typically Yellow
Stainless Steel0 Cycles-400°F (-240°C)1200°F (650°C)Silver
PTFE5 Cycles-450°F (-270°C)550°F (290°C)White
Vespel®5 Cycles-450°F (-270°C)550°F (290°C)Brown

*QPL-18240 and MIL-DTL-18240F requires yellow nylon

®KEL-F is a registered trademark of Minnesota Mining and Manufacturing Co. ®Vespel is a registered trademark of EI. Dupont De Nemours & Co. Neoflon® is a registered trademark of Daikin Industries, LTD. Company, Japan.


Particular formulations of ND Strip meet or exceed the performance requirements of the following specifications and/or standards:

Spec ForSpec NumberND ProcessND Material
Cummins Engine16,512-05ND StripND Strip
Fiat ChryslerPF-5144ND StripNylon
Fiat ChryslerPF-5461ND StripNylon
Fiat ChryslerPF-6157ND StripNylon
Fiat ChryslerPF-6158ND StripNylon
FordES-378813-S100ND StripNylon
FordES-382101-S100ND StripNylon
IFIIFI-124 (INCH)ND StripND Strip
US MilitaryMIL-DTL-18240FND StripND Strip
US MilitaryQPL-18240-33ND StripNylon

Safety, Technical & Process Data Sheets

Process NameMaterialSafety Data Sheet (Applied)Technical Data Sheet (Applied)Process Data Sheet
ND Strip®NylonND1022ND Strip - PDS
ND Strip®Vespel®ND Strip - PDS
ND Strip®Stainless SteelND Strip - PDS
ND Strip®KEL-FND Strip - PDS
ND Strip®CopperND Strip - PDS
Increase product quality while saving time and money with Pre-Applied adhesives and sealants.