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LEFT-HAND THREAD [18 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2023-05-16

English

Subject field(s)
  • Gas Industry
OBS

left-hand thread indicating groove : term related to gas cylinder fittings.

OBS

left-hand thread indicating groove : term standardized by the International Organization for Standardization(ISO).

French

Domaine(s)
  • Industrie du gaz
OBS

encoche pour filetage à gauche : terme relatif aux accessoires de bouteilles à gaz.

OBS

encoche pour filetage à gauche : terme normalisé par l'Organisation internationale de normalisation (ISO).

Spanish

Campo(s) temático(s)
  • Industria del gas
Save record 1

Record 2 2015-03-09

English

Subject field(s)
  • Propulsion of Water-Craft
OBS

According to a left-hand thread, when going ahead the propeller moves in the upper part from right to left(seen from aft).

OBS

direction of rotation, left-handed: term standardized by ISO.

French

Domaine(s)
  • Propulsion des bateaux

Spanish

Save record 2

Record 3 2014-06-10

English

Subject field(s)
  • Springs (Mechanical Components)
DEF

The turning direction of coiling similar to the left-hand thread.

OBS

left hand coiled: term and definition standardized by ISO.

French

Domaine(s)
  • Ressorts (Composants mécaniques)
DEF

Sens de rotation de l'enroulement similaire à un filetage à gauche.

OBS

enroulement à gauche : terme et définition normalisés par l'ISO.

Spanish

Save record 3

Record 4 2002-04-22

English

Subject field(s)
  • Tectonics
CONT

The Tethyan spirals have a left-hand thread(in the engineering sense) whether viewed from either the North Pole or the South Pole...

French

Domaine(s)
  • Tectonique
DEF

Orientation d'un système en échelon par rapport à un observateur qui descendrait les échelons vers la gauche.

Spanish

Save record 4

Record 5 2000-11-22

English

Subject field(s)
  • Lamp Components
  • Lighting
  • Electrical Engineering

French

Domaine(s)
  • Éléments de lampes
  • Éclairage
  • Électrotechnique
DEF

Culot à vis se fixant en tournant dans le sens anti-horaire.

Spanish

Save record 5

Record 6 1999-04-26

English

Subject field(s)
  • Joining Elements (Mechanical Components)
CONT

A thread may be either right-hand or left-hand. A right-hand thread on an external member advances into an internal thread when turned clockwise; a left-hand thread advances when turned counterclockwise.

CONT

A combination collar is a coupling with left-hand threads in one end and right-hand threads in the other.

OBS

Threads are considered to be right-hand and single unless otherwise noted; therefore the specification for a left-hand thread must have the letters LH included.

OBS

Example of a thread identification by standardized symbols: 1/2-13UNC-2ALH.

OBS

left-hand thread : term standardized by ISO.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
CONT

[...] par convention, on dit que le filetage est «à droite» lorsque, en examinant la pièce mâle tenue verticalement, le filet semble monter vers la droite; il est dit «à gauche» si le filet semble monter vers la gauche [...]. En règle générale, on adopte le filetage à droite. Cependant, on peut être amené à adopter un filetage à gauche, pour des raisons de sécurité, lorsque les efforts exercés sur l'assemblage auraient pour effet de provoquer le desserrage d'un écrou fileté à droite.

OBS

«Thread» peut être rendu par «filet» ou «filetage» selon le contexte. «Filetage» désigne l'ensemble des filets et ce dernier terme nous paraît préférable, plus logique. Si on choisit «filet», on devra l'utiliser au pluriel dans ce cas-ci.

OBS

À moins d'indications contraires, le sens des filets est toujours à droite, c'est-à-dire qu'un boulon se visse de gauche à droite (sens des aiguilles d'une montre) dans un trou taraudé. Cependant, les tendeurs et autres mécanismes spéciaux exigent l'utilisation de filets à gauche que l'on identifie par la lettre G, inscrite à la suite de la cotation du filet.

CONT

Pour filetage à gauche, ajouter «-LH» [...]

OBS

filetage à gauche : terme normalisé par l'ISO.

Key term(s)
  • pas à gauche

Spanish

Save record 6

Record 7 1998-12-17

English

Subject field(s)
  • Joining Elements (Mechanical Components)
  • Aeronautical Engineering and Maintenance
CONT

A thread may be either right-hand or left-hand. A right-hand thread on an external member advances into an internal thread when turned clockwise; a left-hand thread advances when turned counterclockwise.

CONT

A combination collar is a coupling with left-hand threads in one end and right-hand threads in the other.

OBS

Threads are considered to be right-hand and single unless otherwise noted; therefore the specification for a left-hand thread must have the letters LH included.

OBS

Example of a thread identification by standardized symbols: 1/2-13UNC-2ALH.

OBS

right-hand thread: term standardized by ISO.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
  • Aérotechnique et maintenance
CONT

[...] par convention, on dit que le filetage est «à droite» lorsque, en examinant la pièce mâle tenue verticalement, le filet semble monter vers la droite; il est dit «à gauche» si le filet semble monter vert la gauche [...]. En règle générale, on adopte le filetage à droite. Cependant, on peut être amené à adopter un filetage à gauche, pour des raisons de sécurité, lorsque les efforts exercés sur l'assemblage auraient pour effet de provoquer le desserrage d'un écrou fileté à droite.

OBS

«Thread» peut être rendu par «filet» ou «filetage» selon le contexte. «Filetage» désigne l'ensemble des filets et ce dernier terme nous paraît préférable, plus logique. Si on choisit «filet», on devra l'utiliser au pluriel dans ce cas-ci.

OBS

À moins d'indications contraires, le sens des filets est toujours à droite, c'est-à-dire qu'un boulon se visse de gauche à droite (sens des aiguilles d'une montre) dans un trou taraudé. Cependant, les tendeurs et autres mécanismes spéciaux exigent l'utilisation de filets à gauche que l'on identifie par la lettre G [ou LH : voir fiche «filet à gauche»], inscrite à la suite de la cotation du filet.

OBS

filetage à droite : terme normalisé par l'ISO.

Key term(s)
  • pas à droite
  • filetage pas à droite

Spanish

Save record 7

Record 8 1998-06-09

English

Subject field(s)
  • Joining Elements (Mechanical Components)
  • Aeronautical Engineering and Maintenance
CONT

The unified thread form accompanied by the unified thread standards has in the past fulfilled the necessary requirements for interchangeability of threaded products between the United States, Great Britain, and Canada. This modified thread form represented two compromises between British Whitworth and United Stated National thread forms. The British accepted the 60° thread angle of the American thread, and the Americans accepted a rounded root and crest similar to the Whitworth form. The United States National unified form for external threads has a rounded root and may have either a rounded or flat crest. The unified thread contours provide advantages over both the earlier forms .... The unified thread is a general-purpose thread that is particularly suited for fasteners.

CONT

Unified and American National screw thread standards ... consist of six series of threads and a selection of special threads that cover nonstandard combinations of diameter and pitch. In general, the unified screw threads are limited to three series; coarse (UNC), fine (UNF), and extrafine (UNEF).

OBS

Under the unified system, threads are specified by giving in order the nominal diameter, number of threads per inch, the initial letters such as UNC or UNF that identify the series, and class of thread(IA, 2A, and 3A or 1B, 2B and 3B).... the specification for a left-hand thread must have the letters LH included.

OBS

See also "8UN", "12UN", and "16UN", which designate the 8-, 12-, and 16-thread series.

CONT

[Example of a thread identification by standardized symbols]:1/2-13UNC-2ALH.

OBS

unified thread: term standardized by ISO.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
  • Aérotechnique et maintenance
CONT

Depuis 1949, le Royaume-Uni, le Canada et les Etats-Unis se sont mis d'accord sur ces filetages et leur désignation : «UNC» pour "Unified coarse thread [...] «UNF» pour «Unified fine thread» [...] «UNEF» pour «Unified extra-fine» [...] «UN» pour «Unified constant pitch» [...] Ces filetages figurent [...] dans la norme américaine ASA B1.1-1960 qui concerne les filetages unifiés.

CONT

Le filetage «Unified National» comprend les séries à filets gros et les séries à filets fins.

OBS

filetage en inches à profil UNJ : terme normalisé par l'ISO.

Spanish

Save record 8

Record 9 1996-03-15

English

Subject field(s)
  • Hand Tools
  • Industrial Tools and Equipment
DEF

[A device] used for removing screws and studs which have broken off. Is made with a tapered left-hand thread.

CONT

Screw extractors are used to remove broken screws without damaging the surrounding material or the threaded hole.

Key term(s)
  • tap extractor
  • bolt extractor

French

Domaine(s)
  • Outillage à main
  • Outillage industriel
DEF

Sorte de mèche spéciale, à filet hélicoïdal, utilisée avec un tourne-à-gauche pour extraire du bois les vis cassées.

Key term(s)
  • extracteur de boulon
  • extracteur de goujon

Spanish

Save record 9

Record 10 1994-07-11

English

Subject field(s)
  • Facilities and Equipment (Rubber)
DEF

A roller having two cuts in the form of one right-and one left-hand thread round the roller cover.

French

Domaine(s)
  • Installations et équipement (Caoutchouc)
DEF

Cylindre (rouleau) présentant deux découpes ayant la forme d'un filet droit et d'un filet gauche autour du revêtement du cylindre.

Spanish

Save record 10

Record 11 1994-07-11

English

Subject field(s)
  • Facilities and Equipment (Rubber)
DEF

A roller having thread cuts.

OBS

The thread or threads may either run continuously for the full length of the roller cover or take the form of right-and left-hand threads centre to ends.

French

Domaine(s)
  • Installations et équipement (Caoutchouc)
DEF

Cylindre (rouleau) présentant des découpes filetées.

OBS

Le ou les filet(s) peuvent soit courir sur toute la longueur du revêtement du cylindre (rouleau), soit prendre la forme de filets droits et gauches du centre vers les extrémités.

Spanish

Save record 11

Record 12 1993-01-23

English

Subject field(s)
  • Metal Fasteners
OBS

A right-hand thread on an external member advances into an internal thread when turned clockwise; a left-hand thread advances when turned counterclockwise.

French

Domaine(s)
  • Clouterie et visserie
OBS

une vis a un pas à droite si elle pénètre dans son écrou par une rotation dans le sens des aiguilles d'une montre; le pas est à gauche dans le cas contraire.

Spanish

Save record 12

Record 13 1992-07-10

English

Subject field(s)
  • Needle Embroidery
DEF

[The embroidery stitch which consists of bringing] the needle through on the left-hand side, [taking] a small stitch on lower line with the needle pointing upwards and the thread behind it [... then taking] a stitch on the upper line with the thread under the needle.

CONT

[The Cretan Stitch] is similar to Roumanian Stitch and serves for filling in spaces comparatively quickly.

French

Domaine(s)
  • Broderie à l'aiguille
DEF

[Le point de broderie qui se fait en exécutant] une série de points verticaux, une fois vers le bas une fois vers le haut, en faisant passer le fil, dirigé vers la droite, sous l'aiguille, à chaque point.

CONT

[Le point crétois], que l'on trouve souvent dans les broderies grecques, a une grande analogie avec le point de piqûre croisé.

Spanish

Save record 13

Record 14 1992-06-30

English

Subject field(s)
  • Cycling
DEF

The right-hand cup of a bottom bracket, screwed to a fixed position in the frame and left in place during bottom bracket overhauls.

CONT

The fixed cup usually has a left-hand thread but can sometimes have a right-hand thread.

French

Domaine(s)
  • Cyclisme
DEF

Cuvette (côté droit de pédalier) qui reste toujours solidement fixée au cadre.

Spanish

Save record 14

Record 15 1988-12-22

English

Subject field(s)
  • Joining Elements (Mechanical Components)
CONT

Threads are designated by standardized notes. Under the unified system, threads are specified by giving in order the nominal diameter, number of threads per inch, the initial letters such as UNC or UNF that identify the series, and class of thread(1A, 2A, and 3A or 1B, 2B, and 3B). Threads are considered to be right-hand and single unless otherwise noted; therefore the specification for a left-hand thread must have the letters LH included.

CONT

Example of a thread identification by standardized symbols: 1/2-13UNC-2ALH.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
OBS

Voir fiches "thread class" et "left-hand thread".

Spanish

Save record 15

Record 16 1988-12-22

English

Subject field(s)
  • Joining Elements (Mechanical Components)
CONT

Unified and American National screw thread standards for screws, bolts, nuts, and other threaded parts consist of six series of threads and selection of special threads that cover nonstandard combinations of diameter and pitch. In general, the unified screw threads are limited to three series: coarse (UNC), fine (UNF), and extrafine(UNEF). A 1/4-inch.-diameter thread in the UNC series has 20 threads/in., while in the UNF series it has 28. In the unified and American National standards, the coarse thread series (UNC and NC) is recommended for general industrial use on threaded machine parts and for screws and bolts. Because a coarse thread has fewer threads per inch than a fine thread of the same diameter, the helix angle is greater, and the thread travels farther in one turn. A coarse thread is preferred when rapidity and ease of assembly are desired, and where strength and clamping power are not of prime importance.

CONT

Threads are designated by standardized notes. Under the unified system, threads are specified by giving in order the nominal diameter, number of threads per inch, the initial letters such as UNC or UNF that identify the series, and class of thread(1A, 2A, and 3A or 1B, 2B and 3B). Threads are considered to be right-hand and single unless otherwise noted; therefore the specification for a left-hand thread must have the letters LH included.

CONT

[Example of a thread identification by standardized symbols]: 1/2-13UNC-2ALH.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
CONT

Norme BS 1580 : 1953 "Unified Screw Threads". Il s'agit des filetages cylindriques de mécanique générale, au profil ISO, mais avec les cotes en pouces. Depuis 1949, le Royaume-Uni, le Canada et les États-Unis se sont mis d'accord sur ces filetages et leur désignation : "UNC" pour "Unified coarse thread" (gros pas)"; "UNF" pour "Unified fine thread"(pas fin); "UNEF" pour "Unified extra-fine thread" (pas extra-fin); "UN" pour "Unified constant pitch" (pas constant). Ces filetages figurent [...] d'une manière plus complète dans la norme américaine ASA B1.1-1960 qui concerne les filetages unifiés.

Spanish

Save record 16

Record 17 1988-12-22

English

Subject field(s)
  • Joining Elements (Mechanical Components)
CONT

The manufacturing tolerance and allowance permitted distinguishes one class of thread from another under the unified thread system. Because allowance is an intentional difference between correlated size dimensions of mating threads, and tolerance is the difference between limits of size, a thread class may be considered to control the looseness or tightness between mating threaded parts. The American National standard for unified and National screw threads provides classes 1A, 2A and 3A for external threads, classes 1B, 2B and 3B for internal threads, and classes 2 and 3 for both internal and external threads. Classes 1A and 2B are for ordnance and other special uses. Classes 2A and 2B are the recognized standards for the bulk of screw-thread work and for the normal production of threads on screws, bolts, and nuts. Classes 3A and 3B are for applications where smaller tolerances than those afforded by 2A and 2B are justified ....

CONT

1/2-13UNC-2ALH. [The thread class here is 2A].

CONT

Threads are designated by standardized notes. Under the unified system, threads are specified by giving in order the nominal diameter, number of threads per inch, the initial letters such as UNC or UNF that identify the series, and class of thread(1A, 2A, and 3A or 1B, 2B and 3B). Threads are considered to be right-hand and single unless otherwise noted; therefore the specification for a left-hand thread must have the letters LH included.

CONT

[Example of a thread identification by standardized symbol]: 1/2-13UNC-2ALH.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
CONT

Degrés de précision des filets. On entend par ajustement des pièces de visserie, le jeu au montage entre la tige filetée et le taraudage. Les types d'ajustement pour les divers degrés de précision requis pour les filets normalisés "Unified" se divisent en trois catégories : 1A, 2A et 3A pour les filets extérieurs, et 1B, 2B et 3B pour les filets intérieurs. Ces catégories différent entre elles par l'importance du jeu et la tolérance.

Spanish

Save record 17

Record 18 1988-12-22

English

Subject field(s)
  • Joining Elements (Mechanical Components)
CONT

Unified and American National screw thread standards for screws, bolts, nuts, and other threaded parts consist of six series of threads and a selection of special threads that cover nonstandard combinations of diameter and pitch. In general, the unified screw threads are limited to three series: coarse (UNC), fine (UNF), and extrafine (UNEF). A 1/4-inch.-diameter thread in the UNC series has 20 threads/in., while in the UNF series it has 28. ... The fine thread series (UNF and NF) is recommended for general use in the automotive and air craft fields for threads subject to strong vibration. In general, a fine thread should be used only where close adjustment, extra strength, or increased resistance to loosening is a factor.

CONT

Threads are designated by standardized notes. Under the unified system, threads are specified by giving in order the nominal diameter, number of threads per inch, the initial letters such as UNC or UNF that identify the series, and class of thread(1A, 2A, and 3A or 1B, 2B, and 3B). Threads are considered to be right-hand and single unless otherwise noted; therefore the specification for a left-hand thread must have the letters LH included.

CONT

[Example of a thread identification by standardized symbols]: 1/2-13UNC-2ALH.

French

Domaine(s)
  • Éléments d'assemblage (Composants mécaniques)
CONT

Norme BS 1580 : 1953 "Unified Screw Threads". Il s'agit des filetages cylindriques de mécanique générale, au profil ISO, mais avec les cotes en pouces. Depuis 1949, le Royaume-Uni, le Canada et les États-Unis se sont mis d'accord sur ces filetages et leur désignation : "UNC" pour "Unified coarse thread" (gros pas). "UNF" pour "Unified fine thread" (pas fin). "UNEF" pour "Unified extra-fine thread" (pas extra-fin). "UN" pour "Unified constant pitch" (pas constant). Ces filetages figurent [...] d'une manière plus complète dans la norme américaine ASA B1.1-1960 qui concerne les filetages unifiés.

Spanish

Save record 18

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