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High Security Padlocks, D-Locks, Accessories and Alternatives

Squire Stronghold PadlocksThis page provides details on the specific padlocks, disc locks and D-locks available and the options that relate to them.


Lock Suitability

We offer a range of locks, including our own SFB RoundLocks and DIB D-Locks as well as the top-end locks from Squire. We find all of our range to give good security at appropriate prices. Our buying power means we can offer good discounts against normal selling prices. We will not supply locks that we have discovered have poor reliability; we only sell locks that we think are good.

Our SFB RL21 RoundLock is recommended for use with the Protector 16mm chains, and the RL21 plus the RL21A adaptor extends this to cover the Protector 19mm chain.

Our SFB DIB-Series compact D-Locks are recommended for use on their own and also with the Protector 11mm/13mm/16mm chains.

The Squire Stronghold closed shackle locks are available in different sizes: the larger sizes (the 65mm SS65CS and the massive 80mm SS80CS and the even more massive SS100CS) are much stronger locks with a higher security rating than the smaller 50mm SS50 range. The larger locks are also heavier (see below for full weight and dimension information).

We offer several alternative locks suited to different chains and different situations, including with a choice of different cylinders as well as high-security combination locks where keys are not wanted.

It is important to use a lock that is a good match for a specific chain - a lock that is an excellent partner for one chain may expose a vulnerability if it was used with a different chain. We offer chain plus lock packages that take this into account.

Note: The Squire SS50CS, SS50C-Combi and SHCB65 locks are too small to be used with the Protector 16mm and larger chains! The shackle opening on several of the smaller locks is not large enough to go around the links on 16mm or bigger chains.

Lock dimensions, weights and other technical details are listed below.

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Dimensions & Technical Information

Lock Model No. Shackle Type Body Width Body Thickness Shackle Diameter Vertical Shackle Clearance Horizontal Shackle Clearance
SFB RoundLock RL21 Enclosed 40.0 (dia) 40.0 (dia) 21.0 15.0 N/A (****)
SFB RoundLock RL21A Enclosed 40.0 (dia) 40.0 (dia) 21.0 15.0-18.5mm(+) N/A (****)
SFB DIB-130 D-Lock D-Lock 156 40 16.0 (++) 130 87
SFB DIB-190 D-Lock D-Lock 156 40 16.0 (++) 190 87
SFB DIB-260 D-Lock D-Lock 156 40 16.0 (++) 260 87
SS100CS Closed 100.0 (+++) 50.0 (+++) 20.0 33.0 28.0
SS80CS Closed 80.0 (+++) 40.0 (+++) 16.0 25.0 23.0
SS65CS Closed 65.0 (+++) 31.8 (+++) 12.7 19.0 19.0
SS65CS-XLN Closed 65.0 (+++) 31.8 (+++) 12.7 20.0 (*) 20.0
SS50CS Closed 50.0 (+++) 26.0 (+++) 10.0 14.0 (*) 14.0
SS50S & SS50P5 Open 50.0 26.0 10.0 26.0 22.0
WS75 Closed 65.0 30.0 12.0 14.0 (*) 27.0 (*)
SHCB65 Closed 65.0 23.0 11.0 15.0 (*) 20.0 (*)

(+) The RoundLock with RL21A socket has a chamfered face that increases the clearance at its outer edge, allowing it to sit inside a Protector 19mm chain link.
(++) The DIB D-Locks have a 16mm-thick hardened alloy steel shackle plus a rubber covering that is approximately 18.2mm diameter overall.
(+++) SS100CS, SS80CS, SS65CS and SS50CS body dimensions are of the steel lock body, excluding any Stormproof cover. The cover adds up to 13mm additional width and additional thickness on the SS100CS.
(*) Shackle clearance figures are approximate.
(****) The RoundLock is a circular section lock (similar to a dumb bell) that fits through a chain link, rather than around it. Horizontal clearance is therefore not applicable.


Lock Weight Summary
Lock Model No. Weight
SFB RoundLock 0.55kg
SFB DIB-130 D-Lock 1.5kg
SFB DIB-190 D-Lock 1.7kg
SFB DIB-260 D-Lock 1.92kg
Squire SS100CS 4.3kg
Squire SS80CS 2.21kg
Squire SS65CS & -XLN 1.0kg
Squire SS50CS 0.6kg
Squire SS50S and SS50P5 (Open Shackle) 0.47kg
SHCB65 0.5kg

SFB RoundLock from PragmasisRoundLock RL21 and RL21A socket comparison

The photos above show our SFB RoundLock, and the comparison between the standard RL21 socket (top-right) and the optional RL21A socket (bottom-right). The chamfered face on the RL21A socket is machined specifically to suit the Protector 19mm chain.

Below is a short video overview of the SFB RoundLock, showing how it can be used with our Protector 16mm and 13mm chains and, with the optional RL21A socket, with the 19mm chains:

Details Common to the SFB RoundLock and DIB-Series D-Locks:
  Mechanism: Disc detainer anti-pick cylinder with 9 discs, protected by rotating anti-drill hardened alloy steel plate.
  Cylinder:The same type of cylinder is shared by the RoundLocks and DIB D-Locks.
There is more information on our DIB-Series D-Locks.

Squire SS50S, SS50CS, SS65CS, SS80CS Padlocks

The photo above shows the Squire SS50-S Open Shackle lock at the left, then the SS50CS, SS65CS and SS80CS Closed Shackle locks.

Details common to Squire SS100CS, SS80CS, SS65CS & -XLN, SS50CS, SS50S (Open Shackle) - All with the R1 Restricted cylinder:
  Mechanism: 6 pin tumbler, 250,000 combinations, anti-bump, anti-drill (two identical cylinders in the normal SS100CS)
  Shackle: Hardened steel
  Shackle Material: Boron alloy steel

Details common to Squire SS80CS, SS65CS & -XLN, SS50CS - All with the NW4 New Wave cylinder:
  Mechanism: 10 pin reversible 4 type encoded dimple cylinder key including active elements and side pins, rollers in the key and wave channel, more than 20 million combinations, anti-bump, anti-drill. Ultimate security!
  Shackle: Hardened steel
  Shackle Material: Boron alloy steel

Details for the Squire SHCB65:
  Mechanism: 4-Digit Recodable combination lock, 10,000 combinations
  Shackle: Hardened steel, rotating

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Closed Shackle or Open Shackle?

A closed shackle padlock is the higher security option because the lock body partly surrounds the shackle (see the photo above), whereas an open shackle padlock has much more of the shackle exposed and thus vulnerable to attack. However, an open shackle lock can be used in more situations and weighs less than its closed shackle equivalent.

Our SFB RoundLock is an unusual design in that it is effectively cylindrical, with the shackle, such as it is, forming the axis of the cylinder. When it is locked through an appropriate chain link, for instance, the shackle section can be 100% protected from attack.

D-Locks and motorcycle disc locks are designed to suit different situations and heavier shackles are offered to counteract the fact that they are exposed.

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Security Ratings/Approvals - CEN, British Standards, Sold Secure

Sold Secure is an independent British security testing and approvals organisation that awards Gold standard to the highest security products, with Silver and Bronze for lower grade products. Note that Sold Secure awards these grades according to a range of criteria appropriate to the intended use. Hence, Sold Secure Motorcycle Gold is different (in fact a much higher standard) when compared with Sold Secure Bicycle Gold. It is important to know the type of grading as well as the level that is required.

CEN is the main European lock standardisation and approvals body. The new CEN EN12320 standard is basically the same as the British Standard BS EN 12320 - lock testing standards are being harmonised across Europe. A higher CEN rating indicates a higher security lock: CEN 6 is the highest rating and CEN 1 is the lowest on that scale. This standard only relates to padlocks and padlock fittings (such as padbars); it does not relate to chains.

LPCB is the preeminent authority in the UK if not the world for the testing of all building and associated hardware.

Classe SRA and NF are both French security testing certifications (with NF the more stringent).

Thatcham is another UK organisation that specialises more in certification of immobilisers, alarms and similar electronic products; we do not regard them as good as Sold Secure for testing physical security products.

The following table shows the ratings and approval information for various of our locks:

Padlock Security Comparison
SFB RoundLock RL21 and RL21A Enclosed Shackle Sold Secure Motorcycle Gold, Bicycle Gold, Quad/ATV Gold, Motor Scooter Gold (Police Preferred Specification)
SFB DIB D-Locks D-Lock Sold Secure Motorcycle Gold, Bicycle Gold, Quad/ATV Gold, Motor Scooter Gold (Police Preferred Specification)
Squire SS100CS Closed Shackle CEN6 - Extra High Security,
CEN EN12320 (new standard) Grade 6+
Sold Secure Motorcycle Gold/Motorcycle Diamond when tested with a 22mm chain
LPCB LPS1654 Issue 1 standard: Approved to level SR4, Police Preferred Specification
Squire SS80CS Closed Shackle CEN6 - Extra High Security,
CEN EN12320 (new standard) Grade 6+
Sold Secure Motorcycle Gold
LPCB LPS1654 Issue 1 standard: Approved to level SR3 with both Squire 6 pin ('S') and NW4 cylinders, Police Preferred Specification
Squire SS65CS Closed Shackle CEN6 - Extra High Security,
CEN EN12320 (new standard) Grade 6
Sold Secure Motorcycle Gold, Police Preferred Specification
Squire SS50CS Closed Shackle CEN4 - Security, CEN EN12320 (new standard) Grade 4 Sold Secure Motorcycle Gold, Police Preferred Specification
Squire SS50S Open Shackle CEN4 - Security, CEN EN12320 (new standard) Grade 4
Squire SS50P5 Open Shackle CEN3, CEN EN12320 (new standard) Grade 3 Sold Secure Bicycle Gold

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Keyed Alike?

It is sometimes possible to have multiple locks all operated with a common key. This is called Keyed-Alike and is only an option with certain types of locks and combinations of locks. It can make life much easier when locking multiple things, or when using multiple locks on a single item. All locks using the same key means you don't have to fumble for the right key and you don't have to carry multiple keys. There is a small extra cost to this option but it is only a small fraction of the cost of the locks.

Our SFB RoundLocks and DIB Series D-Locks share the same type of cylinder and can be supplied at initial order as a keyed-alike set. This means you can have a single key operating a pair of RoundLocks and a DIB D-Lock, for example. This keyed-alike option is only possible at the time of the initial order; it is not possible to key-match a previously-supplied RoundLock or DIB D-Lock.

Multiple Squire Stronghold padlocks (SS100CS/SS80CS/SS65CS/SS50CS/SS50S/WS75) can all use the same key, including when mixing different sizes and types of lock. For example, if you are locking two motorbikes or a bicycle and a shed - you could use a pair of SS65CS padlocks for highest security or one SS65CS for the bike and one SS50CS or SS50S for the shed.

We generally keep a stock of various keyed alike sets and, for the Squire locks only, we can also order locks to match a previously-purchased lock. Special orders from Squire usually take 1-2 weeks.

Please see the explanation below about Squire Key Profiles as we will need to know what type of key, and thus cylinder, we are to match if you order keyed-alike. Please let us know if you are a previous customer or if you purchased your existing lock(s) elsewhere, as well as advising the full key number from the back of the key. Restricted profile keys are also different to standard keys and there are several different restricted profiles. We are not able to supply some restricted profile locks as some are restricted to specific locksmiths etc. We can supply standard profile, and R1 and A440 restricted profile, only. Note that the "A440" is sometimes very faintly stamped in the corner of the key and sometimes it is part of the engraved key number. If a pre-existing lock has been supplied with a key card, please send us a photo of that card, with all embossed lettering visible.

Note: The Squire NW4 ultimate security cylinder is not available keyed-alike. If you need the extreme level of security provided by the NW4 cylinder, you probably don't want more than one lock on the same key!

The Squire SS50P5 locks are not available keyed-alike and they also use a different type of key that cannot be used with the SS50CS/SS50S locks or with the larger locks (such as the SS65CS).

An alternative to keyed-alike locks can be using recodable combination locks. A recodable lock means you can set your own combination and change it as required. More information here.

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Key Profiles for Squire Locks

If you are considering matching a pre-existing Squire lock of the relevant type, be aware that there are several different key profiles for these locks and we need to identify the precise profile in order to provide an appropriately matched keyed-alike lock.

Squire Key Profiles

The photo above shows, in order left-to-right: (1) A standard profile key and (2) a Chinese version of the same thing, then (3) and (4) R1 profile keys with different head design, and finally (5) is an NW4 key. If you look closely, you may be able to see the more convoluted profile of the key itself (i.e. the part that goes into the cylinder) on the R1 keys as compared to the standard profile keys. The A440 profile is similar to R1, but the convolutions (i.e. the ridging) are different so R1 and A440 are not interchangeable.

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Combination Locks

The Squire SHCB65 combination locks are recodable, meaning you can set your own combination and change it as required. This can be ideal when access to a lock must be shared across several people and when access must be controlled over time, such as when an employee leaves or a client departs: Simply change the combination and advise the remaining staff/new clients of the new number.

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DIB D-Lock

DIB D-Lock ComparisonD-Locks can be a versatile alternative to using a padlock when locking a chain. We can supply our own SecurityForBikes DIB-Series compact D-Locks.

These are Motorcycle-grade D-Locks with a genuine 16mm-thick steel double locking shackle.

We have more information on our DIB-Series D-Locks including dimensions and more technical details.

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Number of Keys and Spare Key Blanks

Our SFB RoundLocks and DIB-Series D-Locks are supplied with three keys each. A keyed-alike set of RoundLocks/DIB D-Locks will have three keys for each lock in the set (e.g. a keyed alike set of two RoundLocks is supplied with a total of 6 keys).

Each of the Squire keyed padlocks is supplied with two keys (both for R1 and for NW4 cylinder types); keyed-alike sets have two keys for each lock in the set (e.g. a keyed alike set of two Squire locks is supplied with a total of 4 keys).

The Squire standard 6-pin cylinders are very popular and many key-copying kiosks and locksmiths will have the blanks and are likely to be able to offer a key-cutting service if you require more keys of that type. We can also supply un-cut blanks. (Beware that the Stronghold locks also changed cylinders around 2006 so there is an earlier vintage as well.)

R1 Restricted Profile Keys: We generally now supply the newer R1 restricted profile keys with Squire locks. These are not as common so you may find key-copying locations don't have R1 blanks in stock. We can supply R1 blanks when you can provide a photograph of an existing key or key card.

In all cases where we have supplied a key blank, you would still have to go to a key-cutting outlet to have the blank cut to match your key. Locksmiths may typically charge e.g. £3.00 for cutting each one.

NW4 Profile Keys: These are hi-tech keys with numerous advanced features. Most locksmiths and key-copying locations will not be able to cut additional keys of this type. We do not normally supply NW4 key blanks. We can order additional cut keys from Squire (usually a 1-2 week timescale).

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Lock Maintenance Advice

Good quality locks tend not to need much maintenance in many circumstances. The most important thing is to keep the locks clean as dirt or grit getting inside can cause problems. Traditional oils tend to attract dirt so should be avoided if possible.

Regular Cleaning/Lubrication: You can use things like WD40 but it's really not much good as a lubricant and only good as a water displacer (hence it's name). We tend to prefer GT85 as that is good for cleaning & removing water but also has some PTFE/silicone that helps to keep water out as well as provide lubrication. Turning the lock upside down and using the little plastic straw in the can's nozzle and putting the other end of that right in the keyway and giving it a squirt is the way to do it. You may wish to wear gloves or to use some cloth as there will often be a lot of surplus lubricant coming out of the lock and these are not always ideal all over your hands (or dripping onto a nice carpet if you're doing it indoors!). Graphite powders can also work well if a lock is always dry and never exposed to rain etc - an occasional puff of graphite powder provides good lubrication without attracting dust and dirt, but it may do nothing to exclude water or to remove dirt or water that is already inside the lock. We do not use graphite on any of the padlocks we use as they can all be subjected to damp some time and that makes graphite gum up.

Preventing Freezing: If a lock is exposed to wind and rain and is likely to get wet inside, we use an aerosol lube such as is often used by mountain bikers ("Finesse Multi Lube"). Similar products will probably also work well. That helps to keep the water away and can therefore avoid the problems associated with locks getting frozen solid in cold weather. We do find with the one we use that it gets pretty stiff at around -10 C, but in more normal temperatures it gives a good compromise. Locks that have sliding keyway covers can help to exclude dirt, but they can also trap moisture and potentially increase problems with freezing.

Dealing with Dirty, Sticking or Jamming Locks: If a lock has already got dirt inside and is starting to get sticky to operate with the key, it is a good idea to flush it out soon, before the problem gets worse. GT85 or WD40 are good for this. If it has already got beyond that and is jamming, squirting in a lot of GT85 or WD40 and inserting and removing the key many times (e.g. 30-100 times) and trying (gently) to operate the key repeatedly will invariably free it up. It really can take a lot of flushing and key movements to clear grit etc from inside the cylinder, but it does eventually work virtually every time. The Squire Stronghold locks are precision engineered items and dirt is the enemy so it is much better to keep them clean to avoid problems like this, or if they start to show signs to clean them out as described sooner rather than later. If you use WD40 for this process, you should follow it with something with better lubricant properties as WD40 has almost no lubricating ability.

If your lock has already frozen: If you've got a lock that has already frozen as a result of water getting inside and temperatures dropping such that you can't operate the key, defrost sprays used for clearing car windscreens can often help but may take a while and a few squirts (again, straight into the keyway with the lock inverted). Another option can be to heat the key over a flame or other heat source (taking care not to get burnt etc!) and then to insert the key and leave it for e.g. 30 seconds before trying to operate it, and repeating as required. If it is possible to move the lock into warm surroundings and leave it to warm up and thaw out, that is often an easier but slower option. If you can leave the lock indoors for a day or more, it may help to dry it out inside and help to prevent a repeat occurrence. A non-ideal option can be to flood the outside of the lock with hot water, again with care. All of these techniques should be followed promptly with rinsing the lock with GT85/WD40/similar to remove the water from the melted ice etc so that it doesn't freeze up all over again as soon as the temperature drops! Naturally, you should exercise caution when using any source of heat or with hot water - the lock body and the key can hold and transfer a surprising amount of heat so it is easy to get a surprise burn.

Squire Guarantee: Squire locks we supply have a 10-year guarantee directly with Squire and on the rare occasions we have had to return locks to them, they have provided replacements and refunded postage very quickly. We refuse to sell locks where we've had problems or where the manufacturer has not provided good backup - security has to be reliable or it is worthless! Cheap locks are often a false economy, but even top-quality locks need some occasional care and attention.

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