GB/T 33943-2017High-strength structural anchor bolting assemblies for steel structures (English PDF)

3.1 Structural anchor bolting assemblies

The structural anchor bolting assemblies consist of anchor stud, nut, and washer.

3.2 Anchor stud

3.2.1 Type of anchor stud

The types of anchor stud are Type A and Type B (see Figure 1). Type B is only applicable to specification less than or equal to M39 and property level 8.8.

3.2.2 Dimensions of anchor stud

3.2.2.1 The dimensions of anchor stud are shown in Table 1. The symbols and descriptions of dimensions shall conform to GB/T 5276.

4.2 Technical conditions of anchor stud

The technical conditions and reference standards for anchor stud are shown in Table 5.

The mechanical properties of anchor stud specimen are shown in Table 6.

The tensile load of physical anchor stud is shown in Table 7.

Material: Steel. Screw thread: Tolerances 6g a, Standards GB/T 193, GB/T 9145. Mechanical properties: Property level 8.8 b or 10.9 b, Standard GB/T 3098.1. Tolerances: Product grade C, Standard GB/T 3103.1. Surface treatment c: Not treated; Technical requirements for hot-dip galvanized coating shall be in accordance with GB/T 5267.3; For other technical requirements or surface treatment, it shall be agreed upon by the supplier and the purchaser d. Surface discontinuities: GB/T 5779.1.

a Hot-dip galvanized anchor studs shall be threaded and shall be used in conjunction with nuts with increased tapping dimensions.

b The mechanical properties of the specimen are shown in Table 6. The physical tensile load is shown in Table 7. The rest of the mechanical properties shall be in accordance with GB/T 3098.1.

c When choosing a suitable surface treatment method (such as cleaning and coating), it is necessary to consider the risk of hydrogen embrittlement of anchor studs with a property level of 10.9; see the relevant coating standards.

d Without compromising mechanical properties or functional characteristics, according to the agreement between the supplier and the purchaser, other coatings can be used. It is not allowed to use cadmium or cadmium alloy coatings.

5.4 Guaranteed load test of nut

The guaranteed load test of nut shall be in accordance with the provisions of GB/T 3098.2.

5.5 Hardness test of nut and washer

The hardness test of nut and washer shall be in accordance with GB/T 230.1 or GB/T 4340.1. In case of dispute, the Vickers hardness HV30 shall be used as the arbitration test.

5.6 Surface treatment test

5.6.1 Hot-dip galvanized coating

The test of hot-dip galvanized coating shall be in accordance with the provisions of GB/T 5267.3.

5.6.2 Other anti-corrosion coatings

The test of other anti-corrosion coatings shall be subject to the agreement between the supplier and the purchaser and shall be indicated in the contract.

5.7 Surface discontinuities

The test of surface discontinuities of anchor studs and nuts shall be in accordance with GB/T 5779.1 or GB/T 5779.2.

The hook portion of Type B anchor stud shall be inspected using a 10x magnifying glass.

7.2.3 Nut designation

When the large hexagon nut complying with the requirements of this Standard is required for other connections, such as bolts, it is necessary to order separately.

The designation of hot-dip galvanized (tZn) large hexagon nut with screw thread specification M42 and property level 10 is: Nut GB/T 33943 M42 tZn

7.2.4 Washer designation

When the plain washer complying with the requirements of this Standard is required for other connections, such as bolts, or the matching quantity is required to be increased, it is necessary to order separately.

The designation of hot-dip galvanized (tZn) washer with screw thread specification 42 and hardness 329 HV30~436 HV30 (35 HRC~45 HRC) is: Washer GB/T 33943 42 tZn

7.3 Product marking

For anchor stud and nut products, it shall, in accordance with the provisions of GB/T 3098.1 or GB/T 3098.2, make the marks for property level and fastener manufacturer identification.

7.4 Packaging and packaging marking

7.4.1 Unless otherwise specified, the packaging method shall be determined by the manufacturer.

7.4.2 When the hot-dip galvanized nut and the anchor stud are in the same order, they shall be in the same package. The purchaser may determine the […]