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Shear Nuts (Security Breakaway Nuts)

Security shear nuts, also known as breakaway nuts, snap off nuts or permacone nuts, are a premium 1-way permanent security solution ideal where maintenance is not required.

Designed to prevent unauthorised tampering or removal of equipment or facilities, breakaway nuts are typically used in public areas (schools, hospitals etc) and within the fencing industry, e.g. for security perimeter fencing, and the automotive industry. Can be used anywhere where a permanent fixing is needed.

  • One of the best 1-way security solutions available
  • Breakaway hex nut and cone shaped permanent nut
  • Suitable for high torque applications
  • Vibration resistant
  • Tightened using standard spanner or socket

The hexagon nut section is fully tightened with a standard spanner or socket until the pressure applied surpasses the maximum torque limit, which causes the hexagonal part of the nut to break off, leaving a plain tamper resistant cone shape which is extremely difficult to remove as there is nothing to grip.

Security shear nuts are available from Fastenright in Steel Zinc plated, A2 and A4 stainless Steel or Galvanised mild Steel.

Non-standard sizes and materials are available to order as specials, including custom parts made to drawings.

Shear Nuts Technical Drawing

Metric Technical Information
Bright Zinc Plated A2 & A4 Stainless Steel Galvanised
AF B C D AF B C D AF B C D
M4 N/A N/A N/A N/A 7.0 N/A N/A N/A N/A N/A N/A N/A
M5 N/A N/A N/A N/A 8.0 – 10.0 9.8 N/A 4.7 – 6.3 N/A N/A N/A N/A
M6 14.0 13.9 0.5 7.2 10.0 – 13.0 9.8 – 12.8 N/A 5.5 – 6.0 N/A N/A N/A N/A
M8 16.0 15.8 0.5 7.6 13.0 – 17.0 12.8 – 16.8 N/A 6.0 – 8.0 17.0 16.8 N/A 7.2
M10 19.0 18. 1.0 8.8 17.0 – 19.0 16.8 – 18.8 N/A 7.5 – 10.0 19.0 18.9 N/A 9.2
M12 22.0 21.9 1.0 9.9 19.0 – 22.0 18.6 – 21.8 N/A 8.0 – 10.5 22.0 21.9 N/A 9.2
M14 N/A N/A N/A N/A 22.0 21.8 N/A 9.0 – 12.5 N/A N/A N/A N/A
M16 24.0 23.8 1.0 11.5 24.0 23.8 – 24.0 N/A 10.5 – 15.0 24.0 23.8 N/A 11.5
M20 32.0 31.8 2.8 19.0 30.0 29.7 – 30.0 N/A 18.0 – 19.0 32.0 31.8 2.9 18.8
M24 36.0 38.0 2.6 16.0 N/A N/A N/A N/A 36.0 38.0 2.6 16.0

 

Metric Available Sizes
Material / Size M4 M5 M6 M8 M10 M12 M14 M16 M20 M24
BZP Steel
Galvanised
A2 Stainless Steel
A4 Stainless Steel
black icon image = Available
Size not listed? Please make an enquiry – we may be able to provide it.

 

Imperial Available Sizes
Material / Size 10-24 1/4″-20 5/16″-18 3/8″-16 1/2″-13 5/8″-11
BZP Steel
A2 Stainless Steel
Aluminium
black icon image = Available
Size not listed? Please make an enquiry – we may be able to provide it.

Shear Nut Stainless Steel

Shear Nut Steel Zinc Plated

Shear Nut Galvanised

Shear Nut Galvanised SteelShear Nut Stainless SteelShear Nut Zinc Plated

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