GB/T 24425.1-2009 General type wire thread inserts
1 Scope
This part of GB/T 24425 specifies general type wire thread inserts with symmetrical profile with nominal thread diameter of 2mm~39mm and pitch of 0.4 mm~4mm.
As for the internal thread formed by screwing the wire thread inserts specified in this part into the internal thread for 6H specified in GB/T 24425.5, the tolerance zone is 6H (GB/T 197).
The wire thread inserts specified in this part is applicable to improving the strength of screw holes in material body made of low-strength materials (such as aluminum alloy, magnesium alloy, copper alloy, cast iron and nonmetal), improving the fatigue strength of screws and repairing damaged screw holes.
Note: The nominal thread diameter and specification of wire thread inserts used in this part refer to the nominal diameter and specification of internal thread formed by screwing the wire thread inserts into the internal thread specified in GB/T 24425.5.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 24425. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply to this part of GB/T 24425. However parties to agreements based on this part of GB/T 24425 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to 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 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 insert
GB/T 24425.6 Specification for wire thread inserts
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