Nylok® Blue Nylon Strip

Prevailing Torque Locking Element

Nylok® Torq-Strip® self-locking elements are permanently embedded in the threads of a fastener. When mating threads are engaged, the tough, resilient Blue nylon element is compressed and a counter-force is created to establish a much stronger contact and positive resistance to vibration and loosening.

A Nylok® Torq-Strip® self-locking element can be applied to your own fasteners, or ready-to-install self-locking fasteners can be supplied to meet your specifications. Screws as small as #00-90 (M1.2) can be processed and these Nylok self-locking elements can be applied with equal effectiveness to larger diameter fasteners.


  • Exceptional vibration resistance
  • Eliminates the need for lockwashers
  • Reusable
  • Non-toxic, assembler friendly
  • Available for external threaded fasteners
  • Adjustable
  • Promotes ease of assembly
  • Diverse levels of torque
  • Applicable to various materials
  • Compatible with mating parts
  • Resistant to lubricants, fuel, hydraulic fluids and most commercial sovents
  • Durable
  • Cost effective
  • Nylon (Standard): -70°F to 250°F (-56°C to 121°C)
  • Kel-F® (High Temp): -320°F to 350°F (-195°C to 177°C)
  • Teflon® (High Temp): -90°F to 550°F (-68°C to 288°C)
  • Vespel® (High Temp): -320°F to 700°F (-195°C to 371°C)
Technical Data
  • Color: blue/red
  • Dry Wedge: immediate locking
  • Temperature Range: -56°C (-70°F) to +121°C (+250°F)
  • Shelf life indefinite
  • Size: from M1.2 (#00-80) to anything larger
Performance Results
  • Prevailing On Torque (POT): 5.0–10.0 Nm
  • First Removal Prevailing Off Torque (without preload): min. 2.5–5.0 Nm
  • Fifth Removal Prevailing Off Torque (POT): min. 1.8–2.8 Nm
Manufacturing Specifications

  • FORD
    • ES-378813-S100

  • GM
    • GM6189P

    • MIL-DTL-18240F
    • MILF-18240
    • NASM1283
    • NASM15981
    • NASM25027
    • QPL-18240-33

  • IFI
    • IFI - 100/107
    • IFI - 124
    • IFI - 155
    • IFI - 524
    • IFI - 555
  • Defense
  • Automotive
Nylok® Blue Nylon Strip

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