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GB/T 24425.1-2009 English PDF (GBT24425.1-2009)

GB/T 24425.1-2009 English PDF (GBT24425.1-2009)

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GB/T 24425.1-2009: General type wire thread inserts

This Standard specifies general type wire thread inserts with symmetrical profile, of which the nominal diameter of the thread is 2mm~39mm, and the thread pitch is 0.4mm~4mm. The wire thread insert that is specified in this Part is screwed in the internal thread for 6H specified in GB/T 24425.5. The tolerance zone of the formed internal thread is 6H (GB/T 197).
GB/T 24425.1-2009
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 21.060.10
J 13
General type wire thread inserts
ISSUED ON: OCTOBER 15, 2009
IMPLEMENTED ON: MARCH 01, 2010
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Size ... 5
4 Technical conditions ... 11
5 Marks ... 11
Annex A (informative) Comparison BETWEEN nominal length of wire thread
insert AND number of turns in free state and length after installation ... 12 General type wire thread inserts
1 Scope
This Standard specifies general type wire thread inserts with symmetrical profile, of which the nominal diameter of the thread is 2mm~39mm, and the thread pitch is 0.4mm~4mm.
The wire thread insert that is specified in this Part is screwed in the internal thread for 6H specified in GB/T 24425.5. The tolerance zone of the formed internal thread is 6H (GB/T 197).
The wire thread inserts specified in this Part are suitable for improving the strength of screw holes in the body of low-strength materials (such as aluminum alloy, magnesium alloy, copper alloy, cast iron and non-metal), improving the fatigue strength of screws and repairing damaged screw holes.
NOTE: The "nominal thread diameter" and "wire thread insert specifications" used in this Part REFER TO the nominal diameter and thread specifications of the internal thread formed after the wire thread insert is screwed into the internal thread specified in GB/T 24425.
2 Normative references
The provisions in following documents become the provisions of this Part of GB/T 24425 through reference in this Part. For dated references, the
subsequent amendments (excluding corrigendum) or revisions do not apply to this Part, however, parties who reach an agreement based on this Part are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 197, General Purpose Metric Screw Threads - Tolerances (GB/T 197-
2003, ISO 965-1:1998, ISO general-purpose metric screw threads -
Tolerances - Part 1: Principles and basic data, MOD)
GB/T 1237, Designation system for fasteners (GB/T 1237-2000, eqv ISO
8991:1986)
GB/T 24425.5, Internal thread for wire thread inserts
GB/T 24425.6, Specification for wire thread inserts
4 Technical conditions
The profile dimensions, technical requirements, acceptance inspection, marks and packaging of wire thread inserts are in accordance with the regulations of GB/T 24425.6.
5 Marks
5.1 Marking method
The content and order of marking for wire thread inserts are:
Wire thread insert Standard number Specification of wire thread inserts Number of turns in free state (the wire thread insert without a break groove is added with the letter W after the number of turns in free state)
Others are in accordance with the regulations of GB/T 1237.
5.2 Marking examples
The general type wire thread insert, with a break groove, of which the
specification of wire thread insert is M10, and the number of turns in free state is 8 turns, is marked as:
Wire thread insert GB/T 24425.1 M10-8
The general type wire thread insert, without a break groove, of which the specification of wire thread insert is M10??1, and the number of turns in free state is 12 turns, is marked as:
Wire thread insert GB/T 24425.1 M10??1-12W

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