This standard specifies the types and sizes of probes and handles used for trapezoidal thread gauges with a tooth angle of 30°, a nominal diameter of 8mm to 140mm, and a pitch of 1.5mm to 24mm. The types and sizes of trapezoidal thread gauges specified in this standard are applicable to the trapezoidal thread gauges specified in GB/T8124-2004. GB/T 8125-2004 Trapezoidal thread gauge types and sizes GB/T8125-2004 Standard download decompression password: www.bzxz.net

ICS17.040.30;21.040.10
National Standard of the People's Republic of China
GB/T8125—2004
Replaces GB/T8125—1987
Trapezoidal thread gauges
Types and dimensions of gauges for metric trapezoidal screw threads2004-02-10 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of ChinaStandardization Administration of the People's Republic of China
Implementation on August 1, 2004
GB/T8125—2004
This standard is a revision of GB/T8125—1987 "Types and dimensions of trapezoidal thread gauges" based on ISO/DIS3670 "Plug gauges and handles and their ring gauges - Design and overall dimensions" (English version, 1994). The main differences between this standard and ISO/DIS3670 are as follows: the format has been modified according to GB/T1.12000; the requirements for No. 1 and No. 2 taper locking trapezoidal thread gauges (Table 1, Table 2, Table 3 of the ISO version) have been deleted; the dimensions of the taper locking trapezoidal thread plug gauge probe have been modified (Table 2 of the ISO version); the requirements for No. 10 and No. 11 taper locking trapezoidal thread gauges have been added (Table 2 and Table 3 of this version); the surface roughness requirements for the probe, handle and taper gauge of the trapezoidal thread gauge have been added (Figure 2, Figure 3, Figure 5, Figure A.1 of this version); the requirements for No. 10 and No. 11 taper gauges have been added (Table A.1 of this version). This standard replaces GB/T8125-1987 "Types and Dimensions of Trapezoidal Thread Gauges" from the date of implementation.
Compared with GB/T8125-1987, the main changes of this standard are as follows: - The type diagram of trapezoidal thread gauge in the table has been deleted (Table 1 of the 1987 edition); - The diagram of the trapezoidal thread gauge probe and handle has been deleted (Table 2 of the 1987 edition); - The type diagram of the trapezoidal thread gauge has been added (Figure 1, Figure 4, Figure 8, Figure 12 of this edition); The surface roughness requirements of the probe, handle and taper gauge of the trapezoidal thread gauge have been added (Figure 2, Figure 3, Figure 5, Figure A.1 of this edition). Appendix A of this standard is a normative appendix.
This standard was proposed by the China Machinery Industry Federation. This standard is under the jurisdiction of the National Technical Committee for Standardization of Measuring Tools and Instruments. This standard was drafted by Harbin Measuring Tools and Cutting Tools Factory. The main drafters of this standard are: Wu Ying, Gao Shanming, Yao Xuli, Liu Yongfa, and Zhu Hongjie. The previous versions of the standard replaced by this standard are: GB/T8125-1987.
1 Scope
Trapezoidal thread gauges
Types and dimensions
GB/T 8125—2004
This standard specifies the types and dimensions of probes and handles used for trapezoidal thread gauges with a tooth angle of 30°, a nominal diameter of 8mm to 140mm, and a pitch of 1.5mm to 24mm. The types and sizes of trapezoidal thread gauges (hereinafter referred to as "thread gauges") specified in this standard are applicable to the trapezoidal thread gauges specified in GB/T8124-2004.
2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions are applicable to this standard. GB/T8124-2004 Technical conditions for trapezoidal thread gauges 3 Classification
The type names of thread gauges and the corresponding nominal diameter ranges are shown in Table 1. Table 1
Type name
Double-head taper locking thread plug gauge
Single-head taper locking thread plug gauge
Double-head three-tooth locking thread plug gauge
Single-head three-tooth locking thread plug gaugeWww.bzxZ.net
Double-handle thread plug gauge
Integral thread ring gauge
Double-handle thread ring gauge
4 Types and sizes
4.1 Taper locking type Thread plug gauge
4.1.1 The type of taper locking thread plug gauge is shown in Figure 1. The figure is for illustration only. Through-end probe
Taper locking handle
Nominal diameter 8mm to 50mm
Through-end or stop-end probe
Taper locking handle
Nominal diameter d/mm
8≤d≤50
50
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