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

When assembled with a mating part the resilient ND Strip is compressed. The compressed engineered plastic (normally Nylon) Strip provides locking action in the thread instead of at the bearing surface due to its vibration dampening characteristics. In general, the resilience of ND Strip holds the fastener in place without adhesives or thread distortion. Due to its resilience, ND Strip can be repeatedly adjusted and reused.


Wide Adjustment Range

ND Strip has a wider range of adjustment and a larger working area than most other locking elements due to the fact that the locking element 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

ND Strip is virtually impervious to a wide range of chemicals, water, and motor fluids. ND Strip 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

Fasteners can be reused repeatedly without damage to threads.

Easy to Customize Torque

ND can customize each ND Strip installation to meet your specific requirements by adjusting the length and diameter of the installed material.

Substrate Independent

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


  • Saves Time: ND Strip fasteners can be fed through an automated feeding device to improve your productivity and save time.
  • Saves Money: ND Strip can be inserted into virtually any fastener (standard or special). ND Strip fasteners require no costly lock-washers, cotter pins, or castellated nuts. ND Strip provides close fits without the expense involved in attaining close tolerances.
  • Quality Control:  Pre-Applied ND Strip is installed to specification, insuring consistent performance unlike bottled products.
  • Saves Effort: ND Strip greatly reduces the need for retightening.
  • Won’t Work Loose: Under most operating conditions, ND Strip is unaffected by vibration or reversal of stress.


  • ND Strip is also available in KEL-F®, Vespel®, Copper, Stainless Steel, and PTFE materials for non-standard applications.
  • ND Strip is normally positioned one to three threads back from the end of a fastener to assure ease of starting. Special strip positioning can be specified for specific applications. ND Strip location and length can be tailored to fit your needs.
  • As with all our pre-applied products, ND Industries can install ND Strip into your fasteners at any one of our regional service centers, or we can supply you with fasteners that contain a pre-inserted ND Strip.

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 & Product 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.