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Kinmar® Security Permanent One Way Nut

Tamper resistant Kinmar permanent security nuts

The Kinmar® Unique Hi-Torque security nut is a superior alternative to the shear nut, leaving no un-plated surfaces.

  • Permanent 1-way security nut
  • High torque and resistant to attempted removal
  • Premium security fixing where maintenance is not required
  • Fastened using patented tool
  • Nuts can be re-tightened if needed

The Kinmar® patented head design, with unique indentations in the rounded shape of the nut providing both security and high torque, makes this a cost effective and efficient fixing for applications where the highest level of security is essential and maintenance is not required, e.g. security fencing, street furniture, public transport and playgrounds.
Manufactured in A2 stainless steel, case hardened steel zinc plate or Geomet. The case hardened steel further enhances the security of the nut as it helps prevent hack sawing or chiselling the nut off, and also provides more torque.

A matching driver is required to fasten the nut and tighten to the desired torque. Should the nut become loosened due to vibration, it can be retightened using the tool.
The special security Kinmar® permanent tool is designed to fit hand and power tools for fast efficient installation. The tools are restricted in supply making this a premium security fixing that is not available in the public domain.

Available from stock ranging from M5 to M12 in steel zinc plate, Geomet and A2 stainless steel.
All stocked sizes listed below. Sizes not listed are available to order, with imperial threads available on request.

If you need a reusable fixing see the Kinmar® security removable nut

Not what you’re looking for? See all security nuts here

Material / Size M5 M6 M8 M10 M12
BZP Steel
A2 Stainless Steel
Other Sizes Available Subject To Min Order Qty

Kinmar permanent nut technical drawing

M5 M6 M8 M10 M12
DK (mm) 12.1 12.1 16.1 20.1 24.2
K (mm) 5.6 5.6 7.3 9.2 10.6

*For guidance purposes only

Kinmar Permanent Security Nut