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GB/T 42252-2022: Test method for torque and preload of aviation threaded collars
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GB/T 42252-2022: Test method for torque and preload of aviation threaded collars

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ICS 49.030.99 CCSV20 National Standards of People's Republic of China Torque and pretightening force test method of high lock nut for aviation Posted on 2022-12-30 2023-04-01 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed and managed by the National Aircraft Standardization Technical Committee (SAC/TC435). This document is drafted by. China Aviation Comprehensive Technology Research Institute, Shenzhen Asia Pacific Aviation Technology Co., Ltd., China Aviation Industry Standard Parts System Manufacturing Co., Ltd., Aerospace Seiko Co., Ltd. The main drafters of this document. Miao Shengpei, Zhang Hui, Wang Naiwen, Su Yi, Xu Hao, Li Pengfei. Torque and pretightening force test method of high lock nut for aviation

1 Scope

This document describes the test method for torque and preload of high lock nuts used in aviation. This document is applicable to the testing of locking torque, loosening torque, breaking torque and pre-tightening force of high lock nuts used in aviation.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. JJG269 Verification Regulations for Torsion Testing Machine

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 Locking torque locking torque The high lock nut is screwed into the test mandrel until it touches the interlayer, the maximum torque during the whole process. 3.2 breakaway torque The minimum torque at which a high lock nut is turned in the loosening direction. Note. The loosening torque should be measured when the broken neck groove of the high lock nut is twisted off and the axial load is removed. 3.3 Torque off torque torque-off Torque when the high lock nut is screwed into the test mandrel to make the broken neck groove of the high lock nut break. 3.4 preload In the process of screwing the high lock nut into the test mandrel, the axial load borne by the test interlayer after the broken neck groove is twisted off. 3.5 Test mandrel testbolt Bolts used in conjunction with high lock nuts during the test.

4 General requirements

4.1 Test equipment High lock nut torque and pre-tightening force tests shall be carried out with a torsion-tension testing machine or testing equipment of equivalent precision. The torsion testing machine should be According to the provisions of JJG269, the verification of torque measurement characteristics shall be carried out. The verification results shall meet the accuracy level 1. ...