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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 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 extrafine thread series (UNEF and NEF) is used principally in aeronautical structures where an extremely shallow thread is needed for thin-walled material and where a maximum practicable number of threads is required for a given length.  2, record 1, English, - Unified%20National%20Extra%2DFine%20screw%20thread

Record number: 1, Textual support number: 1 OBS

See also "8N", "8UN", "12N", "12UN", and "16N", "16UN", which concern the 8-, 12-and 16-thread series.  3, record 1, English, - Unified%20National%20Extra%2DFine%20screw%20thread

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 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» (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.  1, record 1, French, - filetage%20UNEF

Record number: 1, Textual support number: 1 OBS

extrafin : Cette graphie, puisée des Rectifications de l'orthographe recommandées par le Conseil supérieur de la langue française, est attestée dans le Petit Robert (2004).  3, record 1, French, - filetage%20UNEF

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 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.  1, record 2, English, - unified%20thread

Record number: 2, Textual support number: 2 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).  1, record 2, English, - unified%20thread

Record number: 2, Textual support number: 1 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.  1, record 2, English, - unified%20thread

Record number: 2, Textual support number: 2 OBS

See also "8UN", "12UN", and "16UN", which designate the 8-, 12-, and 16-thread series.  3, record 2, English, - unified%20thread

Record number: 2, Textual support number: 3 CONT

[Example of a thread identification by standardized symbols]:1/2-13UNC-2ALH.  1, record 2, English, - unified%20thread

Record number: 2, Textual support number: 3 OBS

unified thread: term standardized by ISO.  4, record 2, English, - unified%20thread

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 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.  1, record 2, French, - filetage%20unifi%C3%A9

Record number: 2, Textual support number: 2 CONT

Le filetage «Unified National» comprend les séries à filets gros et les séries à filets fins.  2, record 2, French, - filetage%20unifi%C3%A9

Record number: 2, Textual support number: 1 OBS

filetage en inches à profil UNJ : terme normalisé par l'ISO.  4, record 2, French, - filetage%20unifi%C3%A9

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

Unified and American National screw thread standards for screws, bolts, nuts, and other threaded parts consist of six series of threads [UNC or NC; UNF or NF; UNEF or NEF; 8UN or 8N; 12UN or 12N; 16UN or 16N] and a selection of special threads that cover nonstandard combinations of diameter and pitch.... The 16-thread series(16UN or 16N) is a uniform pitch series for applications that require a very fine thread, as in threaded adjusting collars and bearing retaining nuts. This series is used as a continuation of the extrafine thread series for diameters greater than 2 in.  1, record 3, English, - 16%2Dthread%20series

Record number: 3, Textual support number: 1 OBS

"16N": for the American National thread."16UN": for the Unified National thread.  2, record 3, English, - 16%2Dthread%20series

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 CONT

L'utilisation type des diverses séries est la suivante : [...]. Série à 16 filets. Pour le filetage des colliers d'ajustement et des écrous de retenue des roulements et pour un usage général comme le prolongement des filets surfins.  1, record 3, French, - s%C3%A9rie%20%C3%A0%2016%20filets

Record number: 3, Textual support number: 1 OBS

"16 N" : pour le filetage American National; "16 UN" : pour le filetage Unified National.  2, record 3, French, - s%C3%A9rie%20%C3%A0%2016%20filets

Record number: 3, Textual support number: 2 OBS

Exemple de cotation pour un filetage fin de 1 po de diamètre et de 16 filets au po : 1-16 UNF.  2, record 3, French, - s%C3%A9rie%20%C3%A0%2016%20filets

Record 3,  Textual support,  Spanish