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GB/T 46328-2025: Aircraft - Tubing tolerances
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GB/T 46328-2025: Aircraft - Tubing tolerances

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ICS 49.080 CCSV21 National Standards of the People's Republic of China Aircraft pipe tolerances (ISO 12573.2010,Air-Tubingtolerances-Inchseries,IDT) Published on 2025-10-05 Implemented on May 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Titanium and titanium alloy tubing 3. 4.1 Dimensions 3 4.2 Tolerance 4 5 Aluminum alloy tubing 5 5.1 Dimensions 5 5.2 Tolerance 5 6 Corrosion-resistant steel pipes 6.1 Dimensions 6 6.2 Tolerance 7 7.Nickel alloy tubing 8. 7.1 Dimensions 8 7.2 Tolerance 9

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document is equivalent to ISO 12573.2010 "Aircraft tubing - Tolerances in inches". The following minimal editorial changes have been made to this document. ---To align with existing standards, the standard name has been changed to "Tolerances for Aircraft Tubing"; ---Modify the table format to better suit domestic table-making practices; ---Notes in Table 9 have been updated with the explanation of the symbol "-". Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed and is under the jurisdiction of the National Aircraft Standardization Technical Committee (SAC/TC435). This document was drafted by. Shanghai Aviation Industry (Group) Co., Ltd., and Shanghai Aircraft Design and Research Institute of Commercial Aircraft Corporation of China, Ltd. The institute, Chengdu Kaitian Electronics Co., Ltd., AVIC General Aircraft South China Aircraft Industry Co., Ltd., and Chengdu Aircraft Industry (Group) Co., Ltd. The main drafters of this document are. Huang Shasha, Zhang Ren, Xiao Kai, Han Kaiyu, Ma Yang, Wang Yongmei, He Zhiying, Fu Renlong, Hao Yimeng, and Ren Qizhen. Liu Jiao. Aircraft pipe tolerances

1 Scope

This document specifies the tolerances for circular cross-section tubing used on aircraft.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. ISO 8575 Aerospace Fluid Systems - Hydraulic Systems Piping

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 nominal size Part Number dN Determine the dimensionless properties of the dimensions of fluid system components. Note. For pipes, the nominal size is the nominal value of the outer diameter, expressed in one-sixteenth of an inch (1.59 mm). Example. -04 indicates 4/16in = 0.250in = 6.35mm 3.2 outer diameteroutsidediameter d1 The distance between any two points at 180° intervals around the pipe within the same cross-section on the outer side of the pipe. See Figure 1. Note. Unless otherwise specified, the outer diameter limit includes all allowances for ellipticity (insufficient coaxiality). ...