GB/T 32076.8-2017High-strength structural bolting assemblies for preloading—Part 8: Torshear type bolt with cup head,and nut assemblies (English PDF)

Foreword

GB/T 32076 "preload high strength bolted connections" includes the following nine sections.

--- Part 1: General requirements;

--- Part 2: Preload adaptation;

--- Part 3: HR large hexagon head bolt and nut connection;

--- Part 4: HV hexagonal head bolt and nut connection;

--- Part 5: Flat washers;

--- Part 6: Chamfer flat washers;

--- Part 7: M39 ~ M64 large hexagonal head bolt and nut connection;

--- Part 8: Torsion-cut round head bolt and nut connection;

--- Part 9: Torsion shear large hexagon head bolt and nut connection.

This section GB/T 32076 Part 8.

This section drafted in accordance with GB/T 1.1-2009 given rules.

1 Scope

This part of GB/T 32076 and GB/T 32076.1 specifies the thread size M12 ~ M36, the performance level of 10.9/10, preload High-strength bolt structure with torsional shear type round head bolt and nut connection (hereinafter referred to as bolted connection).

This part of the design of the bolted connection allows the preload >= 0.7Rm × As1).

This part of the bolt connection by a bolt, a nut and a washer (only under the nut supporting surface) composition.

NOTE For proper results, it is important to ensure that the bolts are used correctly. For proper use of the method, consult or refer to the relevant norms. Preload adaptability test methods see GB/T 32076.2.

This section applies to industrial and civil buildings, bridges, tower mast, boiler steel, lifting machinery and other steel structures with pre-load connection Torsional shear type high strength bolt connection.

1) Rm is the nominal tensile strength, As is the nominal stress cross-sectional area of the thread.

2 Normative references

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

GB/T 90.1 fastener acceptance inspection

GB/T 90.2 Fasteners signs and packaging

GB/T 193 ordinary thread diameter and pitch series

GB/T 1237 fasteners marking method

GB/T 3098.1 fasteners mechanical properties of bolts, screws and studs

GB/T 3098.2 fasteners mechanical properties of nuts

GB/T 3103.1 Fasteners Tolerances Bolts, screws and nuts

GB/T 5276 fasteners bolts, screws, studs and nuts size code and labeling

GB/T 5267.2 fasteners non-electrolytic zinc coating

GB/T 5267.3 fasteners hot-dip galvanized layer

GB/T 5779.1 fasteners surface defects bolts, screws and studs general requirements

GB/T 5779.2 fasteners surface defects nuts

GB/T 9145 ordinary thread medium accuracy, the preferred series of the ultimate size

GB/T 22028 hot-dip galvanized thread on the thread to accommodate zinc coating

GB/T 32076.1 preload high strength bolted structure connection - Part 1: General requirements

GB/T 32076.2 preload high strength bolted joints - Part 2 - Preload adaptability

GB/T 32076.3 preload high-strength bolting structure connection deputy Part 3: HR large hexagon head bolt and nut connection

GB/T 32076.6 preload high strength bolted joints - Part 6: chamfered flat washers