sign in / register

Back Start Selection Again

Shear Nut

Shear Nuts are a Break-Away type of security nut, that provide a permanent fastening that is very hard to remove again once installed.

Tamper proof security shear nuts are among the most popular security nuts available and are available in a range of materials to suit indoor or outdoor applications. They are installed with a conventional ring or box spanner or a suitable socket drive.



The shear nut is a "one-way" security nut, that is designed to provide a permanent fixing which once done up, can`t easily be undone again.

Shear Nuts feature a threaded conical section, topped by a hexagonal drive head. The nut is installed using a conventional spanner of the appropriate size.

Once the nut is fully tightened and maximum torque is achieved, the hexagonal drive head shears off leaving the operational conical section of the shearnut permanently in place to anchor whatever it is securing. Sometimes called `break off nuts` as the hexagonal nut section of the fastening `breaks off` once the required torque has been achieved.

This is the reason that the Shear Nut is also sometimes referred to as a Breakaway Nut.


Shear Nut Applications

Shearnuts deliver a simple, low cost solution for any project where a permanent fixing is required.

For example, they are used to anchor park benches to pre-embedded fixing studs, or for securing street signage, etc., ...providing an effective deterrent against theft or vandalism.

The A4 (Marine Grade) Stainless Steel version of the Shear Nut is ideal for use in particularly hostile environments such as coastal locations, or for other marine applications such as on-board boats or ships.


Shear Nut Availability

Shear-nuts are available from stock in a range of metric sizes and a choice of materials.

Stock sizes include; M6, M8, M10, M12, M16 and M20 (larger sizes can be manufactured to order), while materials include BZP steel, galvanised steel and  Stainless Steel (A2 and A4 grades).  


Driver Tools

These one way nuts are installed using a conventional spanner (not supplied), so you won`t need any special Security Driver Type Tools.



Step 2 - You have selected 'Shear Nut' - now click below on the specific type or style you need;

Back to top
About insight Security
  • It's easy to order from us and we're easy to contact...
    whether you need help or advice before or after you buy
  • Our proven, tried and tested products do what we say...
    which is why we can offer you a 'NO QUIBBLE GUARANTEE'
  • Fast Reliable Service... your goods will normally be delivered within 1 to 3 working days - call us if you need them urgently!
  • All our products are very competitively priced... but more importantly, we believe they offer you the Very Best Value!

...these are just a few of the reasons that most of our customers buy from us regularly and recommend us to friends and peer groups. So buy now with confidence - and join the thousands of happy customers we have helped over the last 20 years... and remember, if you're not sure what you need, or which solution is best for you, our specialist advisors will be pleased to help. Just call us on 01273 475500.