Les vis captives de Southco permettent de rassembler des panneaux grâce à la fiabilité éprouvée d'un raccord fileté. En position ouverte, elles restent bien solidaire du panneau extérieur, empêchant la perte de matériel et permettant un assemblage rapide. - https://southco.com/fr_eu_int/fasteners/captive-screws
Vis de serrage/blocage - https://www.telescopes-et-accessoires.fr/vis-de-serrage-bloc...
vis captive en position verrouillée capturant la tête de vis. - https://www.orthopediatrics.com/wp-content/uploads/2022/06/F...
blocage captive - Captive locking - https://www.linguee.fr/francais-anglais/search?source=auto&q...

Ici "lock" est represente une action, pas un objet. Une "captive screw" est une vis imperdable comme le dis Tony.

Again, just a word-for-word guess, but to help you get the correct interpretation of the s/t

I've often seen 'imperdable' used for 'captive' in this sort of sense, which I think is preferable to the direct anglicism.

However, without more context, it's hard to tell just what type of 'screw' this is — your wider context may guide you.


--------------------------------------------------
Note added at 12 hrs (2023-04-10 08:09:29 GMT)
--------------------------------------------------

Clearly, now we have proper context, my suggestion is no longer relevant!

Of course we have no context, but I read this as 'captive-screw lock' (with a hyphen) meaning a device for locking/holding closed/retaining that consists at least in large part of a captive screw.

I have such things securing the removable (easily) side panels of my heat pump. The slotted flat-head plastic 'screws' (they have a minimal thread at the end, but enough to hold the panel in place) are held captive in the side panel by means of spring clips (I had to replace one recently when it rusted out; had to get a bag of 50 of the blighters).


--------------------------------------------------
Note added at 22 hrs (2023-04-10 18:09:07 GMT)
--------------------------------------------------

I've not actually found any examples of fermeture à vis imperdable but the answer above still fits.

The closest I have come in terms of actual physical evidence is:

Les fixations de panneau MONADLOCK™ offrent une conception à vis captive, résistante aux vibrations et à de nombreux cycles de pose."
https://www.lisi-aerospace.com/fr/product/fixations-de-panne...

I've tried with other words like verrouillage, maintien, fixation, attache to no avail, even if such words are found in abundance in texts such as this:

"What are Vis captives ?
La principale caractéristique d'une vis captive est sa capacité à maintenir en permanence une rondelle captive spécialisée « captive » sur sa partie non filetée. Accu se spécialise dans la conception, la fabrication et le support de fixations captives usinées de haute précision. Une rondelle captive sert de retenue, verrouillant ces composants en place. Les attaches captives assurent une liaison sûre et évitent la perte ou l'endommagement de l'attache au sein d'un assemblage en ne permettant pas de démonter complètement la vis.

Ces composants peuvent être utilisés pour fixer des panneaux en tôle ou en captivité, qui sont généralement retenus pour des raisons de sécurité. La tôle ou le panneau est maintenu en place entre la tête de la vis et une rondelle captive, ce qui empêche son retrait complet."
https://accu-components.com/fr/6-vis-captivantes

The captive screw locks itself

There has been a mistranslation from German to English.

Now that I've seen we are dealing with thread inserts, things take on a different turn (joke) to my previous answer. I also see the manufacturer is German, and that what has been translated as 'captive screw lock' is Schraubeverliersicherung or something like 'insurance against screw loss'. This covers not holding a screw captive (in a cover plate, for instance) but ensuring its threads do not succumb to loosening. This can involve formschlüssige Elemente, something like 'parts matching by shape'), and klemmende Elemente, or something like 'friction-fit parts' which can include the plastic inserts in lock nuts, for instance.

In a text on Loctite we find that Verliersicherung:
"LOCTITE Schraubensicherungen sind den herkömmlichen mechanischen Methoden weit überlegen
• Mechanische Sicherungselemente, z. B. Splinte, Sicherungsbleche: Sie wirken lediglich als Verliersicherung für Muttern und Schrauben."
is translated as 'prevention of loosening':
"LOCTITE Threadlockers are superior to traditional mechanical locking methods
Mechanical devices, e.g. split pins and tab washers; Only used to prevent the loss of nuts and bolts from loosening."

The Schraubeverliersicherung function of the thread inserts is an 'anti-loosening' (freinage) function (for the screw in the insert, not for the insert in the body of metal). The German manufacturer's 'screwlock' (note the spelling, which could otherwise be 'screw-lock') thread inserts have a feature that exerts a grip on the screw threaded into it — " The screw lock is achieved by one or more polygonal turns that have a clamping effect on the flanks of the installed screw' — unlike its 'free running' (I would say 'free-running') inserts from which screws can be removed without exceptional effort.

Now, freinage is exactly what we find on the manufacturer's site:

"HELICOIL® Plus Screwlock
Ce filet rapporté dispose d’un système de freinage interne qui s’oppose au dévissage de la vis. Une ou plusieurs spires polygonales serrent les flancs du filet de la vis pour la bloquer."
https://www.boellhoff.com/fr-fr/produits-et-services/element...

So for 'thread insert with captive screw lock', which I believe is your fuller text, I would say filet rapporté avec freinage interne.

Not sure what's the right technical term, but sure that it's what it means.

La vis est immobilisée en place par friction, et ne va pas se dévisser toute seule


[The polygonal twist of the HELICOIL® Screwlock results in] a high friction locking capacity and thus a captive screw lock.
=>
[...] une capacité élevée d'immobilisation par friction et donc une vis qui ne va pas se dévisser d'elle-même / qui tient ferme

https://forums.futura-sciences.com/science-ludique-science-s...


--------------------------------------------------
Note added at 33 days (2023-05-13 10:57:42 GMT)
--------------------------------------------------

AS CONFIRMED BY

Sur le site du client, cette phrase a été traduite par :
"La fonction anti-dévissage est assurée par ..." (= "ne va pas se dévisser toute seule" , no?)