GB/T 16674.1-2016Hexagon bolts with flange -- Small series (English PDF)

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

-- it modifies the surface defects of steel products to be 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 15071.2011, Hexagon Bolts with Flange

– Small Series – Product Grade A.

The technical differences between this Part and ISO 15071.2011 and their reasons are

as follows.

-- it deletes the specification of ISO 15071.2011, "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 5267.4 (Table 2), GB/T 5779.1 (Table 2) and GB/T 1237 (5.1), and deletes

the references of ISO 6157-3, in order to meet Chinese basic standards of

fasteners;

-- it modifies the surface defects of steel products to be in accordance with the

specifications of GB/T 5779.1 (Table 2);

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

and extend the scope of product use (Table 2);

-- it adds the technical requirements of packaging (Table 3), in order to meet

Chinese basic standards of fasteners; and

-- it modifies the Designation Example into the simplified Designation Example (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 15071.

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 organizations of this Part. China Productivity Center for

Machinery.

The drafting organizations of this Part. Ningbo Ningli High-Strength Fastener Industrial

Co., Ltd. and Gem-Year 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 16674.1-2004

Hexagon Bolts with Flange – Small Series