Nylok® Torq-Patch® Locknut

Prevailing Torque Locking Element

Nylok® Torq-Patch® Locknut is a self-locking element comprised of nylon permanently bonded into the threads of a nut. When the Nylok® Torq-Patch® Locknut is engaged, it creates a wedge between the nut and mating part compressing the nylon and creating metal to metal contact opposite the patch. 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.


  • Reusable/adjustable
  • Exceptional vibration resistance
  • Resistant to lubricants, fuel, hydraulic fluids and most commercial solvents
  • Can be applied to any size or thread configuration larger than a M6/1/4” nut
  • Bonds to a broad range of fastener finishes
  • Complies with or exceeds IFI, DIN and major OEM specifications
  • Provides a seal for threads
  • Parts are ready for assembly
  • Precise thread coverage in every part
  • Is not affected by high humidity conditions
  • Environmentally friendly/non-toxic
  • 180° (standard) or 360° (optional) radial coverage
  • Torque can be adjusted to meet specific applications
  • Cost effective
  • No metal removal to reduce fastener strength or performance
Technical Data
  • Color: blue/red (special colors available upon request)
  • Dry Wedge: immediate locking
  • Temperature Range: -56°C (-70°F) to +121°C (+250°F)
  • Shelf life indefinite
  • NYLOK® TORQ-PATCH® locknut is also referred to as TUFLOK®
Performance Results
  • Prevailing On Torque: 5.0–10.0 Nm
  • First Removal Prevailing Off Torque (without preload): min. 2.5–5.0 Nm
  • Fifth Removal Prevailing Off Torque: min. 1.8–2.8 Nm
Manufacturing Specifications

  • GM
    • GM6189P
    • GMW16722

    • MIL - DTL - 18240F
    • NASM25027

  • IFI
    • IFI - 100/107
    • IFI - 155
    • IFI - 555
    • IFI - 560
  • Defense
  • Automotive
Nylok® Torq-Patch® Locknut

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