GB/T 16674.2-2016Hexagon bolts with flange -- Fine pitch thread -- Small series (English PDF)

3098.6 and GB/T 3103.1." (Chapter 1, Edition 2004);

-- it adds for the surface defects of steel bolts. for products grades 8.8, 9.8 and 10.9,

in accordance with the specifications of GB/T 5779.1 (Table 2);

-- it adds that the surface of steel bolts is as processed and deletes surface oxidation

treatment (Table 2);

-- it adds the technical requirements of non-electrolytically applied zinc flake

coatings of steel bolts in accordance with GB/T 5276.2 (Table 2);

-- it adds the technical requirements of passivating treatment of stainless steel bolts

in accordance with GB/T 5267.4 (Table 2); and

-- it is only allowed to omit in Designation that the surface is as processed, instead

of oxidation treatment (5.2).

This Part was redrafted by reference to ISO 15072.2012, Hexagon Bolts with Flange

with Metric Fine Pitch Thread – Small Series – Product Grade A (English Edition).

The technical differences between this Part and ISO 15072.2012 and their reasons are

as follows.

-- it deletes the specification of ISO 15072.2012, "If, in special cases, specifications

other than those listed in this International Standard are required, they can be

selected from existing International Standards,... ISO 965-2 and ISO 3506-1"

(Chapter 1), which does not belong to the content of this Standard;

-- in the Normative References, it uses Chinese standards to replace the

international standards (Chapter 2), adds the references of GB/T 90.2 (Table 2),

GB/T 5779.1 (Table 2) and GB/T 1237 (5.1), in order to meet Chinese basic

standards of fasteners;

-- it adds for the surface defects of steel bolts. for products grades 8.8, 9.8 and 10.9,

in accordance with the specifications of GB/T 5779.1 (Table 2);

-- it adds the technical requirements of packaging (Table 2), in order to meet

Chinese basic standards of fasteners; and

-- it modifies the Designation Example into the simplified Designation Examples

(5.2), in order to meet the specifications of GB/T 1237.

The following editorial modifications are made in this Standard.

-- it changes the name of the standard; and

-- it deletes the Bibliography of ISO 15072.

This Part was proposed by China Machinery Industry Federation.

This Part shall be under the jurisdiction of the National Standardization Technical

Committee on Fasteners (SAC/TC 85).

The responsible drafting organization of this Part. China Productivity Center for

Machinery.

The participating drafting organization of this Part. Ningbo Ningli High-Strength

Fastener Industrial Co., Ltd.

This Part shall be interpreted by the Secretariat of the National Standardization

Technical Committee on Fasteners.

The previous edition replaced by this Part is as follows.

-- GB/T 16674.2-2004

Hexagon Bolts with Flange –

Fine Pitch Thread – Small Series