Nylok® Blue Nylon Torq-Patch® Tuflok®

Prevailing Torque Locking Element

Nylok® Blue Nylon Torq-Patch® Tuflok® is a self-locking element comprised of nylon permanently bonded onto the threads of a fastener. When the Nylok® Blue Nylon Torq-Patch® Tuflok® is engaged, it creates a wedge between the fastener 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 of a fastener
  • 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 on every part
  • Can be applied on external and internal threaded fasteners
  • 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
  • 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® Blue Patch is also referred to as TUFLOK®
Performance Results
  • Prevailing On Torque (POT): 5.0–10.0 Nm
  • First Removal Prevailing Off Torque (without preload): min. 5.0–10.0 Nm
  • Fifth Removal Prevailing Off Torque (POT): min. 1.8–2.8 Nm
Manufacturing Specifications
    • PF5144
    • PF6157
    • PF6158

  • FORD
    • ES 382101-S101
    • ES-N800688-S101
    • ES-384103-S-A
    • WA970

  • GM
    • GM6189P
    • GMW16722

    • MIL - DTL - 18240F
    • NASM15981

  • IFI
    • IFI - 100/107
    • IFI - 124
    • IFI - 524

  • DIN
    • DIN 267 PART 28
  • Electronics
  • Defense
  • Automotive
  • Aerospace
Nylok® Blue Nylon Torq-Patch® Tuflok®

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