Anti-snap cylinders · explained · Manchester
Anti-snap locks: worth it, with one condition.
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- 3-star fitted £65-110
- SS312 Diamond £75-130
- 20-30 min
- Check yours free
Short answer: yes, if you get a real one. The condition is that half the "anti-snap" cylinders sold in this country are not, and the fitter who sold you one may not have told you.
What snapping is
A standard euro cylinder has a structural weak point at the central screw hole, and part of that cylinder sticks out past the handle where anyone can reach it. Grip the protruding end, lever it, and it snaps in two. The break exposes the cam that operates the lock, and the cam can then simply be turned.
It takes seconds. It needs no picks and no skill. That is why it spread: it is easy, quiet and it works on an enormous number of doors fitted before roughly 2012.
What a real anti-snap cylinder does
It does not resist snapping. It chooses where to snap.
An engineered sacrificial groove sits outboard of the working parts. Lever it and the outer section breaks off exactly as designed, in your attacker's hand, leaving the rest of the cylinder intact, still in the door, still locked. They have made noise, wasted time, and got nothing.
The bit that catches people
There are two schemes. Both are real. Insurers accept either.
| Rating | Reality | Fitted |
|---|---|---|
| "Anti-snap", no marking | Marketing. Means nothing. Tested by nobody. | £35-55 |
| TS007 1-star | Not enough alone. Needs 2-star handles. | £45-70 |
| TS007 1-star + 2-star handles | = 3-star. Valid. Costs more overall. | £110-190 |
| TS007 3-star cylinder | Full protection on its own. | £65-110 |
| SS312 Diamond | Sold Secure's scheme. Equivalent. | £75-130 |
The trap is row two. A 1-star cylinder fitted with ordinary handles is not 3-star and does not meet an insurer's requirement, but it will be sold to you as anti-snap and it is technically true. If somebody quotes you 1-star, ask what the handles are. If they look blank, ring someone else.
Do you need it?
Honest test, and we would rather you did this than buy something:
- uPVC or composite door with a euro cylinder? Relevant.
- Cylinder sticking out past the handle? Do it.
- Door fitted before about 2012? Probably no protection.
- Wooden door with a mortice lock? Not relevant. See BS3621.
- Already 3-star stamped on the key? You're done.
Look at the key. Real 3-star and Diamond cylinders usually have it marked on the key head or the cylinder face. If there is no marking anywhere, assume you have not got it.
And the honest caveat
An anti-snap cylinder protects against snapping. It does not stop a brick through the window, and it does not help if the door itself is weak or the frame is soft. It closes the easiest route, quietly and cheaply. It is not a force field, and anyone selling it as one is selling.
Security upgrade · Insurance work · Lock change
Questions people actually ask
Are anti-snap locks actually worth it?
Yes, if it is a genuine TS007 3-star or SS312 Diamond cylinder, and no if it is one of the many marketed as anti-snap with no testing behind it. Lock snapping is quiet, fast and requires no skill, which is exactly why it became common, and it works on a huge number of doors fitted before around 2012. A real 3-star cylinder is £65 to £110 fitted, which is not much to close the easiest way into your house. What it does not do is stop a brick through a window, and anyone selling it as total security is selling.
Is a 1-star anti-snap cylinder good enough?
Not on its own, and this is the most common thing people get wrong. TS007 1-star only reaches the 3-star requirement when it is combined with 2-star security handles. A 1-star cylinder fitted with ordinary handles is not 3-star, will not meet an insurer's requirement, and yet it will be sold to you as anti-snap, which is technically true and practically useless. If someone quotes you a 1-star cylinder, ask what handles are included. If they cannot answer, ring somebody else.
How can I tell if I already have an anti-snap lock?
Look at your key first. Real TS007 3-star and SS312 Diamond cylinders almost always carry the marking on the key head or stamped on the cylinder face where you can see it from outside. If there is no marking anywhere, assume you do not have it, because manufacturers who have paid for certification advertise it. Then look at the edge of the door: if the cylinder sticks out more than about 3mm past the handle, you have a problem regardless of grade, because protrusion is what gives an attacker something to grip.
What's the difference between TS007 3-star and SS312 Diamond?
They are two separate testing schemes that cover much the same attacks: snapping, bumping, picking and drilling. TS007 is run through the Door Hardware Federation with a star rating, and SS312 Diamond is Sold Secure's scheme. Neither is meaningfully better than the other and virtually every insurer accepts either. Some cylinders carry both. The practical difference is price and availability, so buy whichever the fitter actually stocks rather than paying a premium to chase one badge.
Do I need anti-snap on a wooden door?
Only if it has a euro cylinder, which most wooden doors do not. Snapping is an attack on euro cylinders specifically, so a traditional wooden door with a mortice deadlock has nothing to snap. What that door needs instead is BS3621, which is the mortice lock standard your insurer will ask for. If your wooden door has been retro-fitted with a euro cylinder, which does happen, then yes, anti-snap is relevant and you likely also want to check the BS3621 position separately.