GB/T 799-2020 in English

《GB/T 799-2020地脚螺栓》由TC85（全国紧固件标准化技术委员会）归口，主管部门为中国机械工业联合会。

GB/T 799-2020 Foundation bolts English

Foundation bolts

1 Scope

This standard specifies the types and dimensions, specifications and reference standards, and designation of foundation bolts.

This standard applies to the foundation bolts with thread specifications from M8 to M72, performance grades 4.6 and 5.6, and product grade C.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 2 Fasteners - Ends of parts with external thread
GB/T 90.1 Fasteners - Acceptance inspection
GB/T 90.2 Fasteners - Marking and packaging
GB/T 196 General purpose metric screw threads - Basic dimensions
GB/T 197 General purpose metric screw threads - Tolerances
GB/T 1237 Designation system for fasteners
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3103.1 Tolerances for fasteners - Bolts, screws, studs and nuts
GB/T 5267.1 Fasteners - Electroplated coatings
GB/T 5267.3 Fasteners - Hot dip galvanized coatings
GB/T 5276 Fasteners - Bolts, screws, studs and nuts - Symbols and designations of dimensions
GB/T 5779.1 Fasteners - Surface discontinuities - Bolts, screws and studs for general requirements
GB/T 16938 Fasteners - General requirements for bolts, screws, studs and nuts

3 Types and dimensions

3.1 Type A foundation bolts

The types of Type A foundation bolts are shown in Figure 1, and their dimensions are listed in Table 1.

The symbols and designations of dimensions shall comply with GB/T 5276.


The unthreaded shank diameter, ds, shall be approximately equal to the pitch diameter or major diameter of the thread.
a The ends shall be chamfered or rounded according to GB/T 2, at the discretion of the manufacturer.
b The length of incomplete thread shall be u≤2P.

Figure 1 Type A

Table 1 Dimensions of Type A In: mm

Foreword I
1 Scope
2 Normative references
3 Types and dimensions
4 Specifications and reference standards
5 Designation