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21.040.30 - Special screw threads

ICS 21.040.30 Details

Special screw threads

Sondergewinde

Filetages spéciaux

Posebni navoji

General Information

Parent
21.040 - Screw threads

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Standardization Organization
Technical Committee
Directive
Mandate
50
CEN
EN ISO 11363-1:2018/A1:2023(Amendment)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications - Amendment 1 (ISO 11363-1:2018/Amd 1:2023)
SIST EN ISO 11363-1:2018/A1:2023
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SIST
SIST EN ISO 15245-1:2021(Main)
Gas cylinders - Parallel threads for connection of valves to gas cylinders - Part 1: Specification (ISO 15245-1:2021)
EN ISO 15245-1:2021

This document specifies definitions, dimensions and tolerances of parallel screw threads of M30 x 2,
M25 x 2 and M18 x 1,5, for the connection of valves to medical and industrial gas cylinders.
This document does not contain the connection requirements for:
— mechanical strength;
— gas tightness;
— capability of repeated assembly and dismounting operations (this aspect is covered in ISO 13341).

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ISO
ISO 1501:2009/Amd 1:2020(Amendment)
ISO miniature screw threads — Amendment 1: The figure for the tolerance zone of external thread
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CEN
EN ISO 11363-1:2018(Main)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications (ISO 11363-1:2018)
SIST EN ISO 11363-1:2018

ISO 11363-1:2018 specifies dimensions and tolerances for taper screw threads of nominal diameter 17,4 mm (designated as 17E) and 25,8 mm (designated as 25E) used for the connection of valves to gas cylinders.
ISO 11363-1:2018 does not cover the connection requirements for
-      mechanical strength,
-      gas tightness, and
-      capability of repeated assembly and dismounting operations.
Gauge inspection is covered by ISO 11363‑2.

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CEN
EN ISO 11363-2:2017(Main)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 2: Inspection gauges (ISO 11363-2:2017)
SIST EN ISO 11363-2:2018

ISO 11363-2:2017 specifies types, dimensions and principles of use of gauges, to be used in conjunction with the taper threads specified in ISO 11363-1 (i.e. 17E and 25E threads).
It provides examples of calculations for thread gauge dimensions on the large end diameter (Annex A) and draws attention to the limitations of the gauging system specified (Annex B).

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SIST
SIST EN ISO 11363-1:2018(Main)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications (ISO 11363-1:2018)
EN ISO 11363-1:2018

This document specifies dimensions and tolerances for taper screw threads of nominal diameter
17,4 mm (designated as 17E) and 25,8 mm (designated as 25E) used for the connection of valves to gas
cylinders.
It does not cover the connection requirements for
— mechanical strength,
— gas tightness, and
— capability of repeated assembly and dismounting operations.
Gauge inspection is covered by ISO 11363-2.

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SIST
SIST EN ISO 11363-2:2018(Main)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 2: Inspection gauges (ISO 11363-2:2017)
EN ISO 11363-2:2017

This document specifies types, dimensions and principles of use of gauges, to be used in conjunction
with the taper threads specified in ISO 11363-1 (i.e. 17E and 25E threads).
It provides examples of calculations for thread gauge dimensions on the large end diameter (Annex A)
and draws attention to the limitations of the gauging system specified (Annex B).

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SIST
SIST EN ISO 4231:2017(Main)
Hand- and machine-operated circular screwing dies for parallel pipe threads - G series (ISO 4231:2016))
EN ISO 4231:2016

This International Standard is a supplement to ISO 2568 and ISO 4230 and specifies the dimensions of
hand- and machine-operated circular screwing dies intended for production of parallel pipe threads,
G series, in accordance with ISO 228-1.
The general dimensions of these dies (diameter, thickness and fixing dimensions) are in accordance
with ISO 2568 so as to permit the driving of hand-operated dies with the aid of the die stocks defined in
that document.

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ISO
ISO 1501:2009(Main)
ISO miniature screw threads

ISO 1501:2009 specifies the profiles, diameter-pitch combinations, basic dimensions, tolerances, limits of size and designation for ISO miniature screw threads with nominal diameters from 0,3 mm to 1,4 mm. These threads are applicable to timepieces, optical instruments, electrical meters, measuring instruments, etc. The profiles and tolerance system for ISO miniature screw threads (S) differ from the profile and tolerance system for ISO general purpose metric screw threads (M).

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SIST
SIST EN 10226-2:2005(Main)
Pipe threads where pressure tight joints are made on the threads - Part 2: Taper external threads and taper internal threads - Dimensions, tolerances and designation
EN 10226-2:2005

This document specifies the requirements for thread form, dimensions, tolerances and designation for jointing pipe threads, sizes 1/16 to 6 inclusive, for joints made pressure-tight by the mating of the threads. These threads are taper external and taper internal and are intended for use with pipes suitable for threading and for valves, fittings or other pipeline equipment interconnected by threaded joints.
An appropriate thread sealant or jointing compound should be used on the thread to ensure pressure-tight joints.
NOTE 1     Threaded joints using taper external threads and parallel internal threads are detailed in EN 10226-1.
NOTE 2    The requirements for taper external threads are identical in EN 10226-1 and EN 10226-2.
NOTE 3    For pipe threads where pressure-tight joints are not made on the threads see EN ISO 228-1.
NOTE 4    EN 10226-3 gives details of recommended gauging systems for the verification of thread dimensions and thread form.

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CEN
EN 10226-3:2005(Main)
Pipes threads where pressure tight joint are made on the threads - Part 3: Verification by means of limit gauges
SIST EN 10226-3:2005

This part of EN 10226 specifies a process using limit gauges, for the validation of taper internal and external threads and parallel internal threads on piping systems components and other products, the dimensions and tolerances of which are detailed in EN 10226-1 and prEN 10226-2.
The gauging system described may not be suitable, without special precautions, for gauging of threads on injection moulded plastic workpieces.
This part of EN 10226 does not cover completely all the requirements necessary for full control of thread quality and dimensions. Additional control of tools and equipment and visual inspection during production are required to ensure complete compliance with EN 10226-1 and prEN 10226-2, for example the length of useful thread on internally threaded workpieces should be checked by direct measurement.
Annex A gives a summary of the gauges included in this part of EN 10226, together with details of the thread elements controlled by each gauge and gauge identification numbers.
In the event of a dispute over compliance with the requirements of EN 10226-1 and prEN 10226-2, the gauges in this part of EN 10226 are to be considered as decisive for the thread elements which they control on the workpiece.

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CEN
EN 10226-2:2005(Main)
Pipe threads where pressure tight joints are made on the threads - Part 2: Taper external threads and taper internal threads - Dimensions, tolerances and designation
SIST EN 10226-2:2005

This document specifies the requirements for thread form, dimensions, tolerances and designation for jointing pipe threads, sizes 1/16 to 6 inclusive, for joints made pressure-tight by the mating of the threads. These threads are taper external and taper internal and are intended for use with pipes suitable for threading and for valves, fittings or other pipeline equipment interconnected by threaded joints.
An appropriate thread sealant or jointing compound should be used on the thread to ensure pressure-tight joints.
NOTE 1     Threaded joints using taper external threads and parallel internal threads are detailed in EN 10226-1.
NOTE 2    The requirements for taper external threads are identical in EN 10226-1 and EN 10226-2.
NOTE 3    For pipe threads where pressure-tight joints are not made on the threads see EN ISO 228-1.
NOTE 4    EN 10226-3 gives details of recommended gauging systems for the verification of thread dimensions and thread form.

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SIST
SIST EN 10226-3:2005(Main)
Pipes threads where pressure tight joint are made on the threads - Part 3: Verification by means of limit gauges
EN 10226-3:2005

This part of EN 10226 specifies a process using limit gauges, for the validation of taper internal and external threads and parallel internal threads on piping systems components and other products, the dimensions and tolerances of which are detailed in EN 10226-1 and prEN 10226-2.
The gauging system described may not be suitable, without special precautions, for gauging of threads on injection moulded plastic workpieces.
This part of EN 10226 does not cover completely all the requirements necessary for full control of thread quality and dimensions. Additional control of tools and equipment and visual inspection during production are required to ensure complete compliance with EN 10226-1 and prEN 10226-2, for example the length of useful thread on internally threaded workpieces should be checked by direct measurement.
Annex A gives a summary of the gauges included in this part of EN 10226, together with details of the thread elements controlled by each gauge and gauge identification numbers.
In the event of a dispute over compliance with the requirements of EN 10226-1 and prEN 10226-2, the gauges in this part of EN 10226 are to be considered as decisive for the thread elements which they control on the workpiece.

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SIST
SIST EN 10226-1:2004(Main)
Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads - Dimensions, tolerances and designation
EN 10226-1:2004

This part of EN 10226 specifies the requirements for thread form, dimensions, tolerances and designation for jointing pipe threads, sizes 1/16 to 6 inclusive, for joints made pressure tight by the mating of the threads. These threads are taper external (designated by R) and parallel internal (designated by Rp) and are intended for use with pipes suitable for threading and for valves, fittings or other pipeline equipments interconnected by threaded joints.

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CEN
EN 10226-1:2004(Main)
Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads - Dimensions, tolerances and designation
SIST EN 10226-1:2004

This part of EN 10226 specifies the requirements for thread form, dimensions, tolerances and designation for jointing pipe threads, sizes 1/16 to 6 inclusive, for joints made pressure tight by the mating of the threads. These threads are taper external (designated by R) and parallel internal (designated by Rp) and are intended for use with pipes suitable for threading and for valves, fittings or other pipeline equipments interconnected by threaded joints.

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SIST
SIST EN ISO 228-1:2003(Main)
Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1:2000)
EN ISO 228-1:2003

This part of ISO 228 specifies the requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes 1/16 to 6 inclusive. Both internal and external threads are parallel threads and intended for the mechanical assembly of the component parts of fittings, cocks and valves, accessories, etc.

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SIST
SIST EN ISO 228-2:2003(Main)
Pipe threads where pressure-tight joints are not made on the threads - Part 2: Verification by means of limit gauges (ISO 228-2:1987)
EN ISO 228-2:2003

This part of EN ISO 228 specifies the verification, by means of limit gauges, of cylindrical threads, the dimensions and tolerances of which are given in part 1.

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CEN
EN ISO 228-2:2003(Main)
Pipe threads where pressure-tight joints are not made on the threads - Part 2: Verification by means of limit gauges (ISO 228-2:1987)
SIST EN ISO 228-2:2003

This second edition cancals and replaces the first edition (1980). Specifies the verification of cylindrical threads, the dimensions and tolerances of which are given in ISO 228-1. Since this 55o profile has different elements to be verified, it is necessary to provide for several GO and several NOT GO gouges.

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CEN
EN ISO 228-1:2003(Main)
Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1:2000)
SIST EN ISO 228-1:2003

This part of ISO 228 specifies the requirements for thread form, dimensions, tolerances and designation for
fastening pipe threads, thread sizes 1/16 to 6 inclusive. Both internal and external threads are parallel threads,
intended for the mechanical assembly of the component parts of fittings, cocks and valves, accessories, etc.
These threads are not suitable as jointing threads where a pressure-tight joint is made on the thread. If assemblies
with such threads must be made pressure-tight, this should be effected by compressing two tightening surfaces
outside the threads, and by interposing an appropriate seal.
NOTE 1 For pipe threads where pressure-tight joints are made on the threads, see ISO 7-1.
NOTE 2 ISO 228-2 gives details of methods for verification of fastening thread dimensions and form, and recommended
gauging systems.

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SIST
SIST EN ISO 1478:2002(Main)
Tapping screws thread (ISO 1478:1999)
EN ISO 1478:1999
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SIST
SIST EN ISO 15245-2:2002(Main)
Gas cylinders - Parallel threads for connection of valves to gas cylinders - Part 2: Gauge inspection (ISO 15245-2:2001)
EN ISO 15245-2:2001

This International Standard specifies types, dimensions and principles of use of gauges to be used in conjunction with the sealing systems of the parallel threads specified in Part 1. The threads themselves are gauged using GO and NOT GO gauges as described in ISO 1502.

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SIST
SIST ISO 7-2:2001(Main)
Pipe threads where pressure-tight joints are made on the threads -- Part 2: Verification by means of limit gauges
ISO 7-2:2000

This part of ISO 7 specifies a process using limit gauges, for the validation of taper internal and external threads
and parallel internal threads on piping systems components and other products, the dimensions and tolerances of
which are detailed in ISO 7-1.
The gauging system described may not be suitable, without special precautions, for gauging of threads on injection
moulded plastic workpieces.
This part of ISO 7 does not cover completely all the requirements necessary for full control of thread quality and
dimensions. Additional control of tools and equipment and visual inspection during production are required to
ensure complete compliance with ISO 7-1, for example the length of useful thread on internally threaded
workpieces should be checked by direct measurement.
Annex A gives a summary of the gauges included in this part of ISO 7, together with details of the thread elements
controlled by each gauge and gauge identification numbers.
In the event of a dispute over compliance with the requirements of ISO 7-1, the gauges in this part of ISO 7 are to
be considered as decisive for the thread elements which they control on the workpiece.

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ISO
ISO 228-1:2000(Main)
Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation

This part of ISO 228 specifies the requirements for thread form, dimensions, tolerances and designation for fastening pipe threads, thread sizes 1/16 to 6 inclusive. Both internal and external threads are parallel threads, intended for the mechanical assembly of the component parts of fittings, cocks and valves, accessories, etc. These threads are not suitable as jointing threads where a pressure-tight joint is made on the thread. If assemblies with such threads must be made pressure-tight, this should be effected by compressing two tightening surfaces outside the threads, and by interposing an appropriate seal. NOTE 1 For pipe threads where pressure-tight joints are made on the threads, see ISO 7-1. NOTE 2 ISO 228-2 gives details of methods for verification of fastening thread dimensions and form, and recommended gauging systems.

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ISO
ISO 7-2:2000(Main)
Pipe threads where pressure-tight joints are made on the threads — Part 2: Verification by means of limit gauges
SIST ISO 7-2:2001

This part of ISO 7 specifies a process using limit gauges, for the validation of taper internal and external threads and parallel internal threads on piping systems components and other products, the dimensions and tolerances of which are detailed in ISO 7-1. The gauging system described may not be suitable, without special precautions, for gauging of threads on injection moulded plastic workpieces. This part of ISO 7 does not cover completely all the requirements necessary for full control of thread quality and dimensions. Additional control of tools and equipment and visual inspection during production are required to ensure complete compliance with ISO 7-1, for example the length of useful thread on internally threaded workpieces should be checked by direct measurement. Annex A gives a summary of the gauges included in this part of ISO 7, together with details of the thread elements controlled by each gauge and gauge identification numbers. In the event of a dispute over compliance with the requirements of ISO 7-1, the gauges in this part of ISO 7 are to be considered as decisive for the thread elements which they control on the workpiece.

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ISO
ISO 1478:1999(Main)
Tapping screws thread
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CEN
EN ISO 1478:1999(Main)
Tapping screws thread (ISO 1478:1999)
SIST EN ISO 1478:2002
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SIST
SIST ISO 7-1:1995(Main)
Pipe threads where pressure-tight joints are made on the threads -- Part 1: Dimensions, tolerances and designation
ISO 7-1:1994

Specified the designation and lays down the dimensions and tolerances of pipe threads. Gives terms and definition as well as symbols and explanations including examples of the complete designation for a thread. Figures 1 to 4 illustrate details. Tabulates thread dimensions from 1/16 up to and including 6 inch.

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ISO
ISO 7-1:1994(Main)
Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation
SIST ISO 7-1:1995

Specified the designation and lays down the dimensions and tolerances of pipe threads. Gives terms and definition as well as symbols and explanations including examples of the complete designation for a thread. Figures 1 to 4 illustrate details. Tabulates thread dimensions from 1/16 up to and including 6 inch.

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ISO
ISO 228-2:1987(Main)
Pipe threads where pressure-tight joints are not made on the threads — Part 2: Verification by means of limit gauges
SIST ISO 228-2:2001

This second edition cancals and replaces the first edition (1980). Specifies the verification of cylindrical threads, the dimensions and tolerances of which are given in ISO 228-1. Since this 55o profile has different elements to be verified, it is necessary to provide for several GO and several NOT GO gouges.

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SIST
SIST EN ISO 11363-1:2018/A1:2023(Amendment)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications - Amendment 1 (ISO 11363-1:2018/Amd 1:2023)
EN ISO 11363-1:2018/A1:2023
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SIST
SIST EN ISO 15245-1:2002/A1:2013(Amendment)
Gas cylinders - Parallel threads for connection of valves to gas cylinders - Part 1: Specification (ISO 15245-1:2001/Amd 1:2013)
EN ISO 15245-1:2001/A1:2013

This part of ISO 15245 specifies definitions, dimensions and tolerances of parallel screw threads of nominal diameter 30 mm (designated 30P), 25 mm (designated 25P) and 18 mm (designated 18P), for the connection of valves to medical and industrial gas cylinders. This part of ISO 15245 does not cover the connection requirements for:
- mechanical strength;
- gas tightness;
- capability of repeated assembly and dismounting operations.

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SIST
SIST EN ISO 15245-1:2002(Main)
Gas cylinders - Parallel threads for connection of valves to gas cylinders - Part 1: Specification (ISO 15245-1:2001)
EN ISO 15245-1:2001

This part of ISO 15245 specifies definitions, dimensions and tolerances of parallel screw threads of nominal diameter 30 mm (designated 30P), 25 mm (designated 25P) and 18 mm (designated 18P), for the connection of valves to medical and industrial gas cylinders. This part of ISO 15245 does not cover the connection requirements for:
- mechanical strength;
- gas tightness;
- capability of repeated assembly and dismounting operations.

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CEN
EN ISO 15245-1:2001/A1:2013(Amendment)
Gas cylinders - Parallel threads for connection of valves to gas cylinders - Part 1: Specification (ISO 15245-1:2001/Amd 1:2013)
SIST EN ISO 15245-1:2002/A1:2013

2012-11-30 GVN: Draft for // vote received at ISO/CS (see notification in dataservice on 2012-11-29).

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CEN
EN ISO 15245-1:2001(Main)
Gas cylinders - Parallel threads for connection of valves to gas cylinders - Part 1: Specification (ISO 15245-1:2001)
SIST EN ISO 15245-1:2002

This International Standard specifies definitions, dimensions and tolerances of parallel screw threads of nominal diameter 30 mm (designated M30), 25 mm (designated M25) and 18 mm (designated M18), for the connection of valves to medical and industrial gas cylinders. This standard does not cover the connection requirements for: - mechanical tightness; - gas tightness; - capability of repeated assembly and dismounting operation. Note: This aspect is covered in ISO 13341.

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SIST
SIST EN ISO 11363-1:2010/AC:2012(Corrigendum)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications - Technical Corrigendum 2 (ISO 11363-1:2010/Cor 2:2012)
EN ISO 11363-1:2010/AC:2012

This part of ISO 11363 specifies dimensions and tolerances for taper screw threads of nominal diameter 17,4 mm (designated 17E) and 25,8 mm (designated 25E) used for the connection of valves to gas cylinders. It does not cover the connection requirements for: - mechanical strength; - gas tightness; - capability of repeated assembly and dismounting operations. Gauge inspection is covered by ISO 11363-2.

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SIST
SIST EN ISO 11363-1:2010(Main)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications (ISO 11363-1:2010)
EN ISO 11363-1:2010

This part of ISO 11363 specifies dimensions and tolerances for taper screw threads of nominal diameter 17,4 mm (designated 17E) and 25,8 mm (designated 25E) used for the connection of valves to gas cylinders. It does not cover the connection requirements for: - mechanical strength; - gas tightness; - capability of repeated assembly and dismounting operations. Gauge inspection is covered by ISO 11363-2.

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SIST
SIST EN ISO 11363-2:2010(Main)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 2: Inspection gauges (ISO 11363-2:2010)
EN ISO 11363-2:2010

This part of ISO 11363 specifies types, dimensions and principles of use of gauges, to be used in conjunction with the taper threads specified in ISO 11363-1 (i.e. 17E and 25E threads). It provides examples of calculations for thread gauge dimensions on the large end diameter (Annex A) and draws attention to the limitations of the gauging system specified (Annex B).

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CEN
EN ISO 11363-1:2010(Main)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications (ISO 11363-1:2010)
SIST EN ISO 11363-1:2010

ISO 11363-1:2010 specifies dimensions and tolerances for taper screw threads of nominal diameter 17,4 mm (designated 17E) and 25,8 mm (designated 25E) used for the connection of valves to gas cylinders.
It does not cover the connection requirements for:
mechanical strength;
gas tightness;
capability of repeated assembly and dismounting operations.
Gauge inspection is covered by ISO 11363-2.

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CEN
EN ISO 11363-2:2010(Main)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 2: Inspection gauges (ISO 11363-2:2010)
SIST EN ISO 11363-2:2010

ISO 11363-2:2010 specifies types, dimensions and principles of use of gauges, to be used in conjunction with the taper threads specified in ISO 11363-1 (i.e. 17E and 25E threads).
It provides examples of calculations for thread gauge dimensions on the large end diameter and draws attention to the limitations of the gauging system specified.

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SIST
SIST EN ISO 11363-1:2010/AC:2011(Corrigendum)
Gas cylinders - 17E and 25E taper threads for connection of valves to gas cylinders - Part 1: Specifications - Technical Corrigendum 1 (ISO 11363-1:2010/Cor 1:2011)
EN ISO 11363-1:2010/AC:2011

This part of ISO 11363 specifies dimensions and tolerances for taper screw threads of nominal diameter 17,4 mm (designated 17E) and 25,8 mm (designated 25E) used for the connection of valves to gas cylinders. It does not cover the connection requirements for: - mechanical strength; - gas tightness; - capability of repeated assembly and dismounting operations. Gauge inspection is covered by ISO 11363-2.

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SIST
SIST ISO 228-2:2001(Main)
Pipe threads where pressure-tight joints are not made on the threads -- Part 2: Verification by means of limit gauges
ISO 228-2:1987

This second edition cancals and replaces the first edition (1980). Specifies the verification of cylindrical threads, the dimensions and tolerances of which are given in ISO 228-1. Since this 55o profile has different elements to be verified, it is necessary to provide for several GO and several NOT GO gouges.

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    13 pages
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SIST
SIST ISO 228-1:1995(Main)
Pipe threads where pressure-tight joints are not made on the threads -- Part 1: Dimensions, tolerances and designation
ISO 228-1:1994
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    6 pages
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SIST
SIST EN ISO 11116-2:2000(Main)
Gas cylinders - 17E taper thread for connection of valves to gas cylinders - Part 2: Inspection gauges (ISO 11116-2:1999)
EN ISO 11116-2:1999

This International Standard specifies types, dimensions and principles of use of gauges, to be used in conjunction with the taper thread specified in Part 1. Annex A provides examples of calculations for thread gauge dimensions on the large end diameter. Annex B draws attention to the limitations of the gauging system.

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SIST
SIST EN ISO 11116-1:1999(Main)
Gas cylinders - 17E taper thread for connection of valves to gas cylinders - Part 1: Specifications (ISO 11116-1:1999)
EN ISO 11116-1:1999

This International Standard specifies definitions, dimensions and tolerances of a taper screw thread of nominal diameter 17,4 mm (designated 17E), for the connection of valves to medical and industrial gas cylinders. This standard does not cover the connection requirements for: - mechanical tightness; - gas tightness; - capability of repeated assembly and dismounting operations. Gauge inspection is covered in Part 2.

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    8 pages
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SIST
SIST EN 629-2:1999(Main)
Transportable gas cylinders - 25E taper thread for connection of valves to gas cylinders - Part 2: Gauge inspection
EN 629-2:1996

This European Standard specifies types, dimensions and principles of use of gauges, to be used in conjunction with the taper thread specified in EN 629-1. Annex A provides examples of calculations for thread gauge dimensions on the large end diameter. Annex B draws attention to the limitations of the gauging system specified.

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    21 pages
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SIST
SIST EN 629-1:1999(Main)
Transportable gas cylinders - 25E taper thread for connection of valves to gas cylinders - Part 1: Specification
EN 629-1:1996

This European Standard, specifies definitions, dimensions and tolerances of a taper screw thread of nominal diameter 25.8 mm (Designated 25E), for the connection of valves to medical and industrial gas cylinders. Gauge inspection is covered by EN 629-2. This standard does not cover the connection requirements for: - mechanical strength; - gas tightness; - capability of repeated assembly and dismounting operations.

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SIST
SIST ISO/R 1501:1998(Main)
ISO miniature screw threads
ISO/R 1501:1970
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    15 pages
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SIST
SIST EN ISO 1478:1996(Main)
Tapping screws thread (ISO 1478:1983)
EN ISO 1478:1994
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    4 pages
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CEN
EN ISO 1478:1994(Main)
Tapping screws thread (ISO 1478:1983)
SIST EN ISO 1478:1996
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    4 pages
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ISO
ISO 228-1:1994(Main)
Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation
SIST ISO 228-1:1995
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