Nylok® Blue Nylon Pellet

Prevailing Torque Locking Element

Nylok® Blue Nylon Pellet & strip is a self-locking element comprised of nylon permanently embedded into the threads of a fastener. The pellet is a drilled hole with a plug of over sized nylon wedged into the hole. The strip is a milled slot with a string of over sized nylon wedged into the slot. When the pellet & strip are engaged it creates a wedge between the fastener and mating part compressing the nylon and creating metal to metal contact opposite the element. This metal to metal contact results in a positive resistance to vibration and loosening. Since nylon has great memory characteristics, this locking element can be reused several times.


  • Exceptional vibration resistance
  • Eliminates the need for lockwashers
  • Reusable
  • Non-toxic, assembler friendly
  • Available for internal 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
    • NASM25027

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

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