GB/T 3103.4-2014Tolerances for fasteners—Bolt/nut assemblies for service temperatures from －200°C～＋700°C (English PDF)

Foreword

GB/T 3103 "Tolerances for fasteners" includes the following sections.

--- GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts;

--- GB/T 3103.2 tolerances for precision mechanical fasteners - Bolts, screws and nuts;

--- GB/T 3103.3 Tolerances for fasteners flat washers;

--- GB/T 3103.4 tolerance bolt fasteners used in -200 °C ~ 700 °C - nuts. This part of GB /Part 4 T 3103's. This section drafted in accordance with GB/T 1.1-2009 given rules.

This Part replaces GB/T 3103.4-1992 "Tolerances for fasteners bolted connections." This section compared with the GB/T 3103.4-1992 main changes are as follows.

--- Modify the standard name;

--- Modify the scope of the provisions within the temperature range of -200 °C ~ 700 °C using bolts and nuts pair Product Grade (Article Chapter 1);

--- Modify, add normative references (Chapter 2);

--- Clearly stipulates. GB/T 3103.1 predetermined thread size and geometric tolerances do not apply to the working temperature of -200 °C ~ 700 °C Design fasteners (Chapter 3);

--- 1992 canceled version of Table 3, and gives ultimate size and marking external threads in Appendix A.

1 Scope

GB/T 3103 provisions of this part of the bolt in the temperature range of -200 °C ~ 700 °C use - nuts Deputy products grade.

NOTE: Mechanical properties GB/T 3098.8 regulations bolts and nuts, also applies to literature references or standards in this section.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 192 ordinary screw threads - Basic model

GB/T 197 common thread tolerance

GB/T 1031 Geometrical product specifications (GPS) Surface texture Profile method Surface roughness parameters and their values

GB/T 1184 shape and position tolerances without individual tolerance value

GB/T 1804 General tolerances Tolerances for linear and angular dimensions without individual tolerance

GB/T 3098.8 Mechanical properties of fasteners -200 °C ~ 700 °C bolted parts used

GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts

GB/T 13807.2 waist-shaped stud stud connection deputy

3 Product rating

GB/T 3103.1 predetermined thread size and geometric tolerances do not apply to the working temperature of -200 °C ~ designed fasteners 700 °C.

This section provides the product level TA, TB and TC and thread size, dimensional tolerances, geometric tolerances and surface roughness and other factors.

Note: the meaning of the mark represented product rank with GB/T 3103.1 same.