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Security Fasteners and General Fixings from Stock and to order

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Shear Bolts Countersunk

Shear snap-off countersunk bolts

A premium 1-way permanent security solution, ideal where maintenance is not required.

  • Tamper proof – permanent security fixing
  • Security bolt with unique shear off (snap-off)feature
  • Fastened using a standard socket or spanner
  • Flat low profile appearance
  • Ideal for use in prisons, banks, automotive, MOD and aerospace

How security shear bolts work

Countersunk shear bolts, alternatively called breakaway or snap off bolts, offer a premium security solution for applications where only the highest security will suffice.

Fastened using a standard socket or spanner, the hexagonal portion attached to the countersunk head snaps off once the maximum torque of the bolt is reached, leaving a plain head with no drive with which to remove the bolt.

Countersunk shear bolts are often chosen over their button head counterparts for their flat, low profile appearance once fixed, as when the hexagonal portion snaps off it leaves a smooth, continuous surface that maintains the aesthetics of the application.

No security tools are required, however the bolt is irremovable once fastened in place, so these fixings are not suitable for applications requiring maintenance.

Shear bolts countersunk head available from stock and to order

Usually manufactured in A2 or A4 stainless steel, or mild / high tensile steel, coated in zinc / black or galvanised. Other materials and finishes available on request.

There is no stock size chart for this product, although we do hold certain popular sizes in stock, with all other sizes available to order with relatively short lead times. We can also manufacture to your specification or drawing.

See our full range of shear bolts here.

Button Head Shear Bolt Stainless SteelCountersunk Shear Bolt Stainless SteelButton Head Shear Bolt Galvanised Steel