GB/T 5796.2

📋 Scope / 适用范围 ai_extracted

This document specifies the combination series of diameters and pitches for trapezoidal threads, the thread profile of which conforms to the provisions of GB/T 5796.1. This document is primarily applicable to mechanical transmission threads and may also be used for fastening threads.

📝 Foreword / 前言 ai_extracted

This document was drafted in accordance with the provisions of GB/T 1.1—2020 "Directives for Standardization — Part 1: Rules for the Structure and Drafting of Standardizing Documents." This document is Part 2 of GB/T 5796 "Trapezoidal screw threads." GB/T 5796 has been published in the following parts: — Part 1: Profile; — Part 2: Diameter and pitch series; — Part 3: Basic dimensions; — Part 4: Tolerances. This document replaces GB/T 5796.2—2005 "Trapezoidal screw threads — Part 2: Diameter and pitch series." Compared with GB/T 5796.2—2005, apart from structural adjustments and editorial changes, the main technical changes are as follows: — Deleted the content on thread designation (see Clause 5; Clause 5 of the 2005 edition); — Changed GB/T 5796.1 from a normative reference to an informative reference (see Bibliography; Clause 2 of the 2005 edition). This document is modified in relation to ISO 2902:2016 "ISO metric trapezoidal screw threads — Diameter and pitch series." Compared with ISO 2902:2016, this document has made the following structural adjustments: — Clause 4 corresponds to Clauses 4 and 5 of ISO 2902:2016; — Clause 5 corresponds to Clause 6 of ISO 2902:2016. The technical differences between this document and ISO 2902:2016 and the reasons for them are as follows: — Changed ISO 5408 from an informative reference to a normative reference, and replaced it with GB/T 14791 (see Clause 3), to comply with national standard drafting requirements; — Changed ISO 2903 from a normative reference to an informative reference, and replaced it with GB/T 5796.4, to comply with national standard drafting requirements; — Changed the note in Table 1 from a statement-type clause to a requirement-type clause (see Clause 4), clarifying its requirement attribute; — Changed the selection of special pitches from a statement-type clause to a recommendation-type clause (see Clause 4), clarifying its recommendation attribute; — Changed the note on thread designation from a requirement-type clause to a statement-type clause (see Clause 5), as the designation content is not an essential clause of Part 2 (Diameter and pitch series). This document has made the following editorial changes: — Changed the document title to "Trapezoidal screw threads — Part 2: Diameter and pitch series"; — Modified the Bibliography. Please note that some content of this document may be subject to patent rights. The issuing organization of this document is not responsible for identifying patent rights. This document is proposed and managed by the National Thread Standardization Technical Committee (SAC/TC108). This document was drafted by: China Productivity Center for Machinery, Jiangsu Zhuzhe Valve Co., Ltd., Ningbo Ningli High-Strength Fastener Co., Ltd., Wenling Luogang Machinery Co., Ltd. The main drafters of this document: Qiu Cheng, Li Xiaobin, Li Xiaoqin, Zhang Jiansheng, Xu Yong, Lin Lihua. This document was first published in 1965, first revised in 1986, second revised in 2005, and this is the third revision. I GB/T 5796.2—2022 Introduction GB/T 5796 "Trapezoidal screw threads" consists of four parts. — Part 1: Profile. It provides the technical basis for establishing the basic dimension formulas for thread diameters and determining the starting positions of thread tolerance zones for Parts 3 and 4. — Part 2: Diameter and pitch series. It provides the nominal diameter and pitch specification basis for establishing the basic dimension tables for thread diameters and determining the thread tolerance tables for Parts 3 and 4. — Part 3: Basic dimensions. It provides the technical basis for determining the limit dimensions of thread diameters. — Part 4: Tolerances. It provides the technical basis for product manufacturing and inspection. The four parts—Profile, Diameter and pitch series, Basic dimensions, and Tolerances—constitute the complete technical parameter system for "Trapezoidal screw threads." Placing them within a single standard facilitates user reference and application. II GB/T 5796.2—2022 Trapezoidal screw threads — Part 2: Diameter and pitch series

📚 References & Relations / 引用与关联

🔗 Related Standards / 同类标准