Glossary entry (derived from question below)
English term or phrase:
a 3/8\\\" 1/4\\\"-20 adapter
French translation:
adaptateur 3/8\" - 1/4\", longueur 20 mm
English term
a 3/8\" 1/4\"-20 adapter
Il s'agit ici d'un trépied d'éclairage :
"Includes 3/8" to 1/4"-20 Adapter"
"The stand is topped with a 5/8" mounting stud with 3/8" threads, a 3/8" 1/4"-20 adapter, and weighs just 2.2 lb."
https://www.amazon.co.uk/dp/B00EHSLO9M
Je m'emmêle totalement les pinceaux avec ce "3/8" 1/4"-20"
Quelle serait la conversion exacte ici ?
Merci de votre aide
| 5 +1 | adaptateur 3/8" - 1/4", longueur 20 mm |
Johannes Gleim
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| 4 +2 | adaptateur 3/8 à 1/4 po, 20 mm de hauteur |
Gabrielle Garneau
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| Something like this: |
B D Finch
|
Non-PRO (1): GILLES MEUNIER
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Proposed translations
40 years Engineer, 20 years translations
Native in: German
Works in: English to German, German to English, French to German, and 6 more.
adaptateur 3/8" - 1/4", longueur 20 mm
| agree |
Tony M
: Dans le domaine de la photographie, les pas devis sont longtemps normalisés en 1/4" ou 3/8" Whitworth, à surtout pas traduire!
2 hrs
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Yes, as Withworth tread is cone-shaped.
|
Canada
Language as a passion·née des mots
Native in: French (Variant: Canadian) 
Works in: English to French, Spanish to French
adaptateur 3/8 à 1/4 po, 20 mm de hauteur
http://www.amazon.com/Standard-Female-Reducer-Adapter-Precision/dp/B017RICIGG
https://www.amazon.ca/Standard-Female-Reducer-Adapter-Precision/dp/B017RICIGG
| agree |
GILLES MEUNIER
9 mins
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| agree |
Kim Metzger
3 hrs
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| neutral |
B D Finch
: Your "L'adaptateur comporte des sillons mâles de 1/4 de pouce et des sillons femelles de 3/8 de pouce." is confusing. See the description I've just posted as a reference comment. The length is in cm because it needn't be standardised to inches.
7 hrs
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Reference comments
Discussion
When non-metric units are used in metric countries which are not converted because they represent a specific standar threadform, as here, the lengths are still given in metric, as a measurable length of no standard significance.
And yes, if you have a figure of 16, it almost certainly also means 16 mm long — very often in FR, for both lengths and sometimes diameters, the mm are taken as read.