Shear Nuts (Security Breakaway Nuts)

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Security shear 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

Breakaway nuts – how they work

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 stock in steel zinc plate, A2 and A4 stainless steel or galvanised mild steel, with other sizes and materials available to order.

 

Metric Sizes

Material / Size M4 M5 M6 M8 M10 M12 M14 M16 M20 M24
BZP Steel
Galvanised
A2 Stainless Steel
A4 Stainless Steel
Other Sizes Available Subject To Min Order Qty

Imperial 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
Other Sizes Available Subject To Min Order Qty

Shear nuts technical drawing

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

*For guidance purposes only – please confirm on order

Shear Nut Stainless Steel

Shear Nut Steel Zinc Plated

Shear Nut Galvanised

Shear Nut Galvanised SteelShear Nut Stainless SteelShear Nut Zinc Plated