Fortress Locks – How to Design a Lock for your Environment?



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Lock Codes   |   Lock Types   |   Selecting your Engraving   |   Why Choose Fortress   |   Forced Extraction   |   Master Locks





Lock Codes




Fortress locks have over 200,000 different lock combinations. Each different key combination is allocated with an engraving (code) onto the lock and the key. The engraving can be up to a maximum of 30 characters (3 lines of 10 characters).



The Engraving (code) features on the front of keys, locks, and lock protectors



Figure 1: CLK-SUSS – Standard Key   |   CLIN – No Lock Protection   |   CLIS – Standard Lock Protection | CLIL – Padlock-able Lock Protection


Interested in retrofitting dust cover protection to your lock? Click Here to View our Accessories




All codes are engraved in capitals only. When supplying the engraving a backslash (/) indicates that the following details are to be carried over to the next line (*Unless requested otherwise, i.e. “E/SW” to be engraved on one line only).


i.e. MACHINE A/AREA B/WELDING would be engraved as:



1st line: MACHINE A
2nd line: AREA B
3rd line: WELDING









Lock Types & Protection



Normally In Lock (NIL) – A lock which retains a trapped key whilst a hazard remains present within a safeguarded space.

Normally Out Lock (NOL) – A lock which has no key present whilst a hazard remains present within a safeguarded space.

Locks can perform two functions when it comes to trapped keys solutions.

1. Prevent access to keys (such as those in a Normally In Lock)

2. Enable the transfer of keys through a sequential process; if a key is inserted and trapped into a lock, this can release another key (e.g. the insertion of a key into the Normally Out Lock position can free a key in a Normally In Lock position ).





Environment plays an important role in selecting the most appropriate lock and module design. Our locks are all stainless steel, however these can be build into either metal alloy enclosures or full stainless steel modules.

Module Material   >>>   Lock Particulate Protection



Clean – Standard Lock module

Dirty/ Dusty – A Dust Cover Protected Lock

Metal Flyings – A Dust Cover Protected Lock

Lock-Out – A Lock with Padlock-able Dust Cover

Paper/Pulp – A Dust Cover Protected Lock

Wet / Humid / General Wash-Down – Standard Lock module

Salt-Water Exposure – Stainless Steel (SS)

Low Temperature – Stainless Steel (SS)

Explosive – View our range of certified products for Hazardous Locations and Explosive Atmospheres






Standard Lock Module   |   CLIN

Standard Lock Module with Dust Protection   |   CLIS

Standard Lock Module with Padlock-able Protection  |   CLIL




Figure 2: Standard Lock Types (Robust Metal Alloy Casing, Stainless Lock Barrel)




Stainless Steel Lock Module   |   CLSN

Stainless Steel Module with Dust Protection   |   CLSS

Stainless Steel Module with Padlock-able Protection   |   CLSL




Figure 3: Full Stainless Steel Lock Types





Selecting Your Lock Engraving



Location   >>>   Operation   >>>  Purpose














Why Choose Fortress?




Robust Stainless Steel Design   |   Personalised Engravings   |   Over 200,000 Unique Combinations   |   Custom Lock Label Colours








Forced Extraction



Personnel safety keys are a form of mechanical measure or ‘proactive inhibit function‘ to lock a door in the open position, either through mechanically preventing a sequence from being performed or by maintaining safety contacts in the open position.



The removal and pocketing of the safety key prevents other keys being removed to return hazardous energy or systems and therefore safety contacts being reset.



“What happens if the safety key is not removed from a lock?”



Standard personnel key retaining locks (or safety key locks) only require the key to be rotated to allow a guard to be opened for whole body access. Additional features should be implemented where pocketing of this safety key is critical for personnel safety.



The forced-extraction safety-key retaining lock requires an additional mechanism to open a guard. The Extraction Band must be lowered over the lock barrel in order for a guard to be opened. See figure 4(e) below, to operate the handle, the key inserted into the top most lock must be rotated and removed, followed by the extraction band being lowered.


Figure 4: (a) a set of locks with Extracted Safety, Standard Safety, and Access; (b) The Forced Extraction Safety Lock; (c) The Standard Safety Lock; (d) The Access Lock; (e) An interlock with Forced Extraction and Standard Safety Locks



Where three locks are present as shown in Figure 4(a), the operation would be as follows:


1.  The Access Key is inserted into the access lock (d).

2. The Safety Key in the Forced Extraction Safety Lock (b) must be removed by personnel entering a safeguarded space.

3. The Safety Key in the Standard Safety Lock (c) can also be taken inside the safeguarded space if a second operator requires entry.

4. Whilst either safety keys in ‘2.’ or ‘3.’ are removed from their respective locks, the Access key in ‘(d)’ cannot be removed, hazardous energy cannot be returned and restart cannot unexpectedly begin.





The RFID Safety Key



Section Coming Soon…








Mastered Locks



Section Coming Soon…








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