Glossary entry (derived from question below)
English term or phrase:
Main Bearing Groove Nuts
Portuguese translation:
porcas dentadas do mancal principal
English term
Main Bearing Groove Nuts
SCOPE OF WORK DETAIL
Module: Scheduled Service
=================
Periodicity: Every 24 months
Component: Generator
Manual - Task Name: Torque Requirement: **Generator Damper** to Generator Frame Attachment
Module: Routine Service
===============
Periodicity: Every 12 months
Component: Down Tower Assembly
Manual - Task Name: Visual Inspection: **Converter Bridge Cabinet**
Component: Drive
Manual - Task Name: Torque Requirement: **Main Bearing Groove Nuts**
Component: Foundation and Outer Area
Manual - Task Name: Visual Inspection: **Pad Mount Transformer**
Component: Foundation and Outer Area
Manual - Task Name: Visual Inspection: **Pad Mount Transformer**
Component: Nacelle
Manual - Task Name: Torque Requiment, Function Test, Visual Inspection: **Nacelle Hoist**
Oct 1, 2019 15:32: Mario Freitas Created KOG entry
Feb 25, 2020 02:05: Mario Freitas changed "Field" from "Other" to "Tech/Engineering"
Proposed translations
Brazil
32 years engineering/law/contracts
Native in: English (Variant: US) 
, Portuguese (Variant: Brazilian) 
Works in: English to Portuguese, Portuguese to English
porcas dentadas do mancal principal
https://www.google.com.br/search?q="porca dentadaa"&um=1&cli...
| agree |
Matheus Chaud
: Pensei tanto no mancal x rolamento e errei na porca. Uma ranhura é o pior lugar possível para se fazer um buraco (de porca/parafuso, p.ex.). A vida útil vai para a cucuia - propagação de trinca na certa. Achei tb. grooved nut = porca ranhurada.
5 hrs
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É verdade Mats. No such a thing. Obrigado!
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Brazil
Technical - Fast - good price - accurate
Native in: English (Variant: US) , Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English, English, and 1 more.
Porcas da ranhura do rolamento principal
United States
BA in Transl., MA in ESL, 15 yrs of exp.
Native in: Portuguese
Works in: English to Portuguese, Portuguese to English, Spanish to Portuguese, and 2 more.
roscas do / para o rolamento principal
Brazil
IT Specialist • M.A. in Linguistics
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English, and 1 more.
porcas da ranhura do mancal principal
Essas ranhuras às vezes servem para lubrificação.
Mais tarde pesquiso mais um pouco para ver se acho algum link confirmando.
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Note added at 1 hr (2017-09-12 13:33:11 GMT)
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Confirmado - pelo menos nos sites que vi, são mancais, não rolamentos.
Ex.:
http://compound.modelengines.info/bearings.html
http://www.autozone.com/repairguides/Chrysler-Front-Wheel-Dr...
(figura 5)
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Note added at 1 hr (2017-09-12 13:34:41 GMT)
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Só deixando mais uma observação - é bem possível que sejam mancais principais (main bearings), no plural.
Portuguese to English, English to Portug
Native in: English
Works in: Portuguese to English, English to Portuguese
Discussion
https://www.google.pt/search?q=groove nuts&client=firefox-b&...