GB/T 32076.3-2015High-strength structural bolting assemblies for preloading - Part 3: System HR - Hexagon bolt with large width across flats and nut assemblies (English PDF)

1 Scope

GB/T 32076 in this part of the GB/T 32076.1 specifies the thread size of M12 ~ M36, a large hexagonal series, the performance rating

8.8/8 and 10.9/10, HR type, preload connected high-strength structural bolting bolts and nuts.

This part of the design allows the bolts and nuts vice preload >=0.7Rm × A1) s, and the main extension of the plastic elongation of the bolt guarantee performance. To this end, part shall have the following characteristics.

--- Type 1 (standard) nut height, such as GB/T 6170;

--- Bolt thread length according to GB/T 3106.

This section provides the nuts and bolts connecting deputy shall further include the GB/T 32076.5 (at the nut bearing surface only) and/or GB/T 32076.6 Regulation

Set of gaskets.

Note. In order to obtain satisfactory results, ensure the correct use of the bolt is very important. About the right way to use, consult or refer to the relevant specification.

Preload aptitude test see GB/T 32076.2.

This section applies to industrial and civil construction, bridge, tower mast structure, boiler steel structure, lifting machinery and other steel structures preload connection

The high strength bolts.

Appendix A gives the nuts and bolts connecting deputy general clamping length and clamping length.

Appendix B gives the European steel bolting two application types described.

1) Rm is the nominal tensile strength, As is the nominal thread stress area.

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 3 common thread ending, from the shoulder, undercuts and chamfers

GB/T 90.1 Fasteners acceptance inspection

GB/T 90.2 Fasteners marking and packaging

GB/T 193 common thread diameter and pitch series

GB/T 1237 marking method fasteners

GB/T 3098.1 Mechanical properties of fasteners Bolts, screws and studs

GB/T 3098.2 Mechanical properties of fasteners

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

GB/T 3104 Fasteners Hexagon width across products

GB/T 3106 Bolts, screws and studs - Nominal lengths, and thread lengths for general purpose bolts

GB/T 5267.2 fasteners non-electrolytic zinc flake coating

GB/T 5267.3 Fasteners hot dip galvanized coatings

GB/T 5779.1 Fasteners - Surface discontinuities - Bolts, screws and studs for general requirements […]