GB/T 3106-2016 English PDF (GBT3106-2016)

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GB/T 3106-2016: Fasteners -- Bolts, screws and studs -- Nominal lengths and thread lengths
GB/T 3106-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
H 13
Replacing GB/T 3106-1982
Fasteners – Bolts, Screws and Studs –
Nominal Lengths and Thread Lengths
(ISO 888. 2012, MOD)
ISSUED ON. FEBRUARY 24, 2016
IMPLEMENTED ON. JUNE 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Symbols... 4 
4 Position of Lengths and Thread Lengths ... 5 
5 Dimensions for lengths ... 8 
6 Dimensions for thread lengths ... 9 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T3106-1982, Nominal Lengths for Bolts, Screws and Studs
–and Thread Lengths for General Purpose Bolts. Compared with GB/T 3106-1982, the
main technical differences are as follows.
-- it changes the name of the standard;
-- it adds symbols and terms (Chapter 3);
-- it adds the designation of lengths and thread lengths (Chapter 4);
-- it gives limiting dimensions in accordance with product grades (Table 1); and
-- it changes “thread lengths for general purpose bolts” into “dimensions for thread
lengths”.
This Standard was redrafted by reference to ISO 888.2012, Fasteners – Bolts, Screws
and Studs – Nominal Lengths and Thread Lengths (English edition).
The technical differences between this Standard and ISO 8673.2012 and their reasons
are as follows.
-- in the Normative References, it uses Chinese standards to replace the
international standards (Chapter 2), in order to meet Chinese basic standards of
fasteners.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of the National Standardization Technical
Committee on Fasteners (SAC/TC 85).
The responsible drafting organizations of this Standard. China Productivity Center for
Machinery.
The drafting organizations of this Standard. Shanghai Jinma High Strength Fastener
Co., Ltd., Shaoxing Sunny High Strength Fasteners Co., Ltd. and Aozhan Industrial
Co., Ltd.
This Standard shall be interpreted by the Secretariat of the National Standardization
Technical Committee on Fasteners.
The previous edition replaced by this Standards is as follows.
-- GB/T 3106-1982.
Fasteners – Bolts, Screws and Studs –
Nominal Lengths and Thread Lengths
1 Scope
This Standard specifies the nominal lengths and thread lengths for bolts, screws and
studs used in product standards and other relevant documents, for example parts
drawings.
This Standard applies to bolts, screws and studs whose thread is in accordance with
GB/T 192.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced document (including any
amendments) applies to this Standard.
GB/T 2 Fasteners – Ends of Parts with External Thread (GB/T 2-2016, ISO
4753.2011, MOD)
GB/T 192 General Purpose Metric Screw Threads – Basic Profile (GB/T 192-2003,
ISO 4759-1.2000)
GB/T 3103.1 Essential Oils and Aromatic Extracts – Determination of Residual
Benzene Content (GB/T 3103.1-2002, ISO 4759-1.2000, IDT)
GB/T 5276 Fasteners – Bolts, Screws, Studs and Nuts – Symbols and Description
of Dimensions (GB/T 5276-2015, ISO 225.2010, MOD)
3 Symbols
b thread length
b1 thread length of one end for double-end stud
b2 thread length of the other end for double-end stud
bm thread length of the stud metal end
d nominal diameter of the thread
l nominal length (of bolt, screw or stud)
-- lg, max = lnom – b
-- ls, min = lg, max – 5P
b) for slotted or recessed screws and similar screws (e.g. pan head, cheese head,
countersunk head specified in GB/T 5276) and studs, the tolerance for b is .