GB/T 6173-2015 English PDF (GB/T6173-2015)

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GB/T 6173-2015: Hexagon thin nuts -- Fine pitch thread
GB/T 6173-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.20
J 13
Replacing GB/T 6173-2000
Hexagon Thin Nuts – Fine Pitch Thread
[ISO 8675.2012, Hexagon Thin Nuts Chamfered (Style 0) with
Metric Fine Pitch Thread – Product Grades A and B, MOD]
六角薄螺母 细牙
ISSUED ON. DECEMBER 31, 2015
IMPLEMENTED ON. APRIL 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Dimension ... 6
4 Technical Conditions and Reference Standards ... 7
5 Markings ... 8
Foreword
GB/T 6173 is one of the serial national standards of “Hexagon Nuts (Part)”, which
include.
--- GB/T 41 Hexagon Nuts, Style 1 – Product 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;
--- GB/T 6173 Hexagon Thin Nuts – Fine Pitch Thread;
--- GB/T 6174 Hexagon Thin Nuts – Unchamfered;
--- GB/T 6175 Hexagon Nuts, Style 2;
--- GB/T 6176 Hexagon Nuts, Style 2 – Fine Pitch Thread.
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 6173-2000 Hexagon Thin Nuts – Fine Pitch Thread;
compared with GB/T 6173-2000, this Standard mainly has the following technical
changes.
--- Delete “if other technical requirements are needed, ... the selection in (GB/T
3098.15 and GB/T 3103.1).” (Chapter 1 of Edition 2000);
--- Unify the reference thread standards to be GB/T 193, GB/T 9145 (Chapter 2);
--- Modify the inner chamfer into θ=110°~120° (Figure 1);
--- Increase the mechanical properties of steel nuts. QT – Quenching and Tempering
(Table 3).
This Standard adopts re-drafting method to modify and use ISO 8675.2012 Hexagon
Thin Nuts Chamfered (Style 0) with Metric Fine Pitch Thread – Product Grades A and
B (English Edition).
This Standard has the following technical differences and causes from ISO 8675. 2012.
--- Delete ISO 8675 provision. “if other technical requirements are needed, ...
selection in ISO 4759-1” (Chapter 1), which don’t belong to the contents specified
by this Standard;
--- In the normative references, use national standards to replace the international
Hexagon Thin Nuts – Fine Pitch Thread
1 Scope
This Standard specifies the type and dimension, technical conditions and markings of
hexagon thin nuts – fine pitch thread.
This Standard is applicable to the chamfered hexagon thin nuts – fine pitch thread with
thread nominal diameter D = 8mm~64mm; Performance Grades 04, 05, A2-025, A2-
035, A4-025, A4-035, CU2, CU3 and AL4; Product Grades A and B. Grade A is applied
to the nuts with D≤16mm; while Grade B is applied to the nuts with D>16mm.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
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 Screw Threads – Diameters and Pitches (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 3098.10 Mechanical Properties of Fasteners - Bolts, Screws, Studs and Nuts
Made of Non-Ferrous Metals (GB/T 3098.10-1993, eqv ISO 8839.1986)
GB/T 3098.15 Mechanical Properties of Fasteners – Nuts Made of Stainless Steel
(GB/T 3098.15-2014, ISO 3506-2.2009, MOD)
GB/T 3103.1 Tolerances for Fasteners – Bolts, Screws and Nuts (GB/T 3103.1-
2002, idt ISO 4759-1.2000)