GB/T 6176-2016Hexagon nuts, style2 -- Fine pitch thread (English PDF)

Foreword

GB/T 6176 is one national standard of "Hexagon nuts (part)" series. This series

includes.

- GB/T 41, Hexagon nuts, style 1, grade C;

- GB/T 6170, Hexagon nuts, style 1;

- GB/T 6171, Hexagon Nuts, Style 1-Fine Pitch Thread;

- GB/T 6172.1, Hexagon thin nuts (chamfered);

- GB/T 6173, Hexagon thin nuts (chamfered) with fin pitch thread;

- GB/T 6174, Hexagon thin nuts - unchamfered;

- GB/T 6175, Hexagon nuts, style 2;

- GB/T 6176, Hexagon nuts, style 2, with fine pitch thread;

- GB/T 6177.1, Hexagon nus wit flange, style 2;

- GB/T 6177.2, Hexagon nuts with flange, style 2 - Fine pitch thread.

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard replaces GB/T 6176-2000 Hexagon nuts, style 2 - Fine pitch

thread. Compared with GB/T 6176-2000, the main technical changes are as

follows.

- deleted "If other technical requirements are required,... select among

(such as GB/T 3098.10 and GB/T 3103.3)" (Clause 1 of Edition 2000);

- unified reference thread standards as GB/T 193, GB/T 9145 (Clause 2);

- added QT - Quenching and tempering in mechanical properties of nuts

(Table 3);

- deleted steel nut surface oxidation; added. not treated (Table 3);

- in marks, the surface treatment shall be only allowed to omit. the surface

is not treated, instead of surface oxidation (5.2).

This Standard is modified on the basis of adopting ISO 8674.2012 Hexagon

high nuts (style 2) with metric fine pitch thread - Product grades A and B (English

version).

Hexagon nuts, style 2 - Fine pitch thread

1 Scope

This Standard specifies type sizes, technical conditions and marks of hexagon

nuts, style 2 - fine pitch thread.

This Standard is applicable to hexagon nuts, style 2 - fine pitch thread of which

thread nominal diameters are D - 8 mm ~ 36 mm, performance grades are 8,

10 and 12, the product grades are A and B. Grade A is used for nuts of which D

<= 16 mm; Grade B is used for nuts of which D > 16 mm.

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 90.1, Fasteners--Acceptance inspection (GB/T 90.1-2002, ISO

3269.2000, IDT);

GB/T 90.2, Fasteners--Marking and packaging;

GB/T 193, General purpose metric screw threads - General plan (GB/T 193-

2003, ISO 261.1998, MOD);

GB/T 1237, Designation system for fasteners (GB/T 1237-2000, eqv ISO

8991.1986);

GB/T 3098.2, Mechanical properties of fasteners - Nuts (GB/T 3098.2-2015,

ISO 898-2.2012, MOD);

GB/T 3103.1, Tolerances for fasteners- Bolts, screws and nuts (GB/T 3103.1-

2002, idt ISO 4759-1.2000);

GB/T 5267.1, Fasteners - Electroplated Coatings (GB/T 5267.1-2002, ISO

4042.1999, IDT);

GB/T 5267.2, Fasteners - Non-electrolytically applied zinc flake coatings

(GB/T 5267.2-2002, ISO 10683.2000, IDT);

GB/T 5276, Fasteners - Bolts, screws, studs and nuts - Symbols and

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