Spring mechanism

All these information is my own experiments and thoughts.

The spring mechanism continues to interest me and it is very advanced. The possibility to open all the functions at the same time or hold all the functions in an open position that will put maximal strain on the spring. There is pressure in a Swiss Army knife and on the internet you can find some information on this. This pressure can be very high. I did experiment and I did feel this pressure from the spring when all functions was in this maximal position. For me the notch to prevent accidental closing did put very much strain on the system. The spring hurt. The precision in a SAK is very high and it is in the Victorinox philosophy that the knife is always in the elastic region. To open all the functions at the same time is in their philosophy. One should never leave the functions over time in these positions. This is why as a collector i always only open a few functions fully when cleaning and so on. This is only to be gentler on the mechanism like I explained before.

For me there is a special interest with the floating spring and its three functions because this is the evidence of a SAK. For me there is a link between the rivet for the awl and the center rivet for the floating spring. The precision of the orbit for the notch in the flat screwdriver is important.

The spring on this layer is a very multifunction spring.

update cleaning

Like i explained when i clean a SAK i open only a few functions fully this meaning not in the half way position but fully locked out. It is my understanding that opening all the functions at the same time or hold the half way position will put maximal strain on the spring. It is much better i believe to open all the functions fully out(locked out) if you need to do so cleaning the knife.Usually it is only for picture purpose to open all the functions in the area that will put maximal strain. This to show the functions and so on.

The quality of a SAK is very high and there is no need to worry

Cleaning update


When i clean a SAK and lock out fully a few functions it is important to move one function at the time from locked out position to closed position. Doing so the dirt and sand will be cleaned from the mechanism. It is absolutely not dangerous to move one function back and forth.


Again it is only as a safety precaution i recommend to be careful opening all the functions at the same time. Doing so if you receive a older or hard used knife that may have damages you will not damage it further.


Maintenance on a Swiss Army knife is in my mind needed for several reasons and also in my mind it is needed to make sure that the mechanism is free and then the functionality will be best. Dirt and substances gums up the mechanism and it will prevent the function to open and close correct. Maintenance is needed to prevent damage on the SAK.


superb blade and spring!

It is time for a long overdue update for this article. The quality on Victorinox SAKs is so high that failure practically never happens. They never fail from normal use. There is no need to worry about opening all the functions at the same time because the Swiss Army Knife is always in the elastic region. The only thing is when or if the knife got some damage or is full of dirt.

On the picture today you can see a 93mm red Alox Solo. This category is one of my favourite because of the extra sturdy design and quality. Here you can see the blade spring exposed when you have the blade not fully extended. The 93mm category is different compared to the 91mm Officiers construction because of the ability to have 3 functions on one spring with its familiar backside functions. The 91mm models are my best choice for EDC because the functionality is higher.



While I am at it today we can have some more fun talking about SAKs. Above you see a Climber model next to the Solo Alox model. I prefer the 91mm Officiers models for EDC because of the extra functionality. The Officers knife or Officiers as they are marked got the special spring system that allows for backside functions.

On the picture to the right you can see how the Alox 93mm or PioneerRange today got some serious functionality. The Farmer X is a very nice model in deed. Everything about it is perfect! Below you see a set of Victorinox knives and different categories. Some models borrow constructions from other categories in history. The 111mm is a hybrid in the construction. What is obvious with knives from Switzerland is the ability to make a sandwich construction with superb durability for the spring mechanisms.

Beautiful knives



There is perhaps a love hate for the notch used on the Offiers flat screwdriver. This is there to prevent accidental closing and yes it works. On the picture to the right you can see how this looks like. There is an evolution for the 91mm Officers knife as there is on most knives by Victorinox. 


1999: 3 month modified keyring attachment on spring, improved 90 degree flat screwdriver with notch to prevent accidental closing.



02.02.2022 SwissChamp

The SwissChamp got some advanched mechanisms for sure!

10:23 You will find the combination Phillips driver used on different models on SAKs. The use of inline Phillips is normal to find. There is an evolution on this to prevent accidental closing. This you see on the tang for the spring mechanism. 

10:31 The Swiss Army Knife is more than just a knife blade in deed.

05.02 2022 Notch, awl and key ring

I have talked some about this before and in the 1999 evolution mentioned above you have a date for the intoduction of the notch used to prevent accidental closing. There is already information regarding the different springs and design evolution on the web. On the picture you can see some hints you can use further. There is an evolution on the spring for the key ring and the notch. This can be used for dating the SAKs.

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26.07 | 23:05

Hi and thank you very much for question. The closest I know is the Master Fisherman 1.4753.72. The. 73 is related to what inlay it got maybe. Best Regards Trond

26.07 | 19:22

Hello Trond,
I received a Mechanic in a red/white Victorinox box. The box is stamped item number 1.47 53.73. Do you know what knife goes in this box? Not Mech

01.07 | 23:13

Hi, sure I would like to see, BR. Trondsak@sakhome.com

01.07 | 16:24

Hello Trond.

Would you be interested in seeing progress pictures
Of my custom Champ with Voyager digital clock scales.
I could email them to you.


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