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Security Armour Rings

Product Enquiry for AR01 | Security Armour Rings

We welcome all types of commercial enquiry for screws, nuts, bolts etc.

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Security armour rings – tamper resistant

A maintenance free permanent fixing used for covering and encasing any standard and British standard hexagon nuts and hexagon bolts (also including hexagon head coach screws).

  • Permanent 1 way security fixing
  • Hammer on nut, applied using a standard hammer
  • Conical collar fits standard bolts & nuts
  • Smooth finish, no sharp edges
  • Ideal for maintenance-free applications

Security Armour Rings are manufactured and stocked in stainless steel or steel zinc plate with other sizes and materials available to order.


Material M6 M8 M10 M12 M16 M20
BZP marker-image marker-image marker-image marker-image marker-image marker-image
A2 ST/ST marker-image marker-image marker-image marker-image marker-image marker-image

Tamper resistant Security Armour Rings (1-way hammer-on nuts)

Security Armour Rings are a unique security nut with a simple but effective design, having a conical collar, which is hammered over any British Standard or Din Standard hexagon bolt or nut, rendering the fixing tamperproof.

Not being governed by torque, applied to existing hex nut or hex bolt heads by simply ‘hammering on’, leaving a smooth finish. This makes it an ideal permanent security fixing for maintenance free applications where health and safety are important, as there are no sharp edges.

Security Armour Rings can be installed using a standard hammer but there are special tools available, for faster and easier installation.

How to apply a security Armour ring

Armour ring on bolt imageHammer image

Armour ring technical drawing

M6 M8 M10 M12 M16 M20
A (mm) 15.8 20.0 26.6 33.0 41.2 51.0
B (mm) 10.9 14.2 18.6 20.8 26.7 33.5
C (mm) 7.2 10.5 12.0 13.5 17.3 19.0
D (mm) 6.8 7.7 9.8 12.3 16.0 19.0

*For guidance purposes only

Armour Ring